July. 2023

GASKETSGASKET NAVI

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Products

GASKETS
TOMBO BRAND GASKETSNICHIAS gaskets support the development of various
industries in Japan and overseas.
We provide new value of maintaining safety throughproducts derived from the “Insulation and Protection”
technology and services that solve problems from all
angles.

GASKETSTOMBO BRAND GASKETS

Gaskets play an important role in the prevention of fluid leakage frompiping and equipment parts in all industrial fields such as the petroleum
refining and chemical industry, ships, construction, electric power, andsteel.
NICHIAS pursues customer satisfaction with the advanced technologyof “Insulation and Protection” and provides peace of mind and trust.

You can choose from a wide
range of line-up according
to your requirements.

1
Sheet gaskets* TOMBO is a registered trademark or trademark of NICHIAS Corporation.
* SGM, EZL, TRIGUARD are trademarks of W.L. Gore&Associates. Inc.
* Names with TM are trademarks of NICHIAS Corporation.

P15-P36
4

GAS K ET S

Insulation and Protection technology that
continues to deepen with development capabilities
cultivated over many years and reliable quality2
Semi-metallic gaskets

P37-P59

3

4

Metallic gaskets

PastesRubber gaskets
Cloth gaskets
Other sealing materials

P60-P68

P69-P78
GA S K E T S

5

Gasket solution service
Based on the knowledge cultivated over 125 years of history, NICHIAS has prepared three solutions, “GASKET
NAVI”,「GASKET工房」and “GASKET LAB” which utilize the latest technology and data.
With the aim of ensuring safe operation of all plants and improvements through preventive maintenance, weare based on the “Insulation and Protection” ® technology.
We support the new value of maintaining safety with advanced technology.

A suitable gasket can be easily selected

Explain how to pronounce 工房 as overseas persons don’t know how to read it.
Avoid delay of the construction period of plant maintenance.
Urgent requests can be responded on the spot.

Leakage prevention
Skills of flange tightening work

Available in web andmobile App

This is a technical support application that allows you to quickly select gaskets andcalculate tightening torque on your PC, smartphone, or tablet. It contains various
product information such as gasket characteristics, technical data, and handlingprecautions.
Search by usage conditions
You can search and select the recommended gasket just by inputting the type, temperature, and pressure of the fluid.
Search by industry
You can search for NICHIAS recommended products by industry.
Tightening torque calculation
The minimum tightening torque required for tightening and the stress applied to the boltat that time can be easily calculated.
WE B si t e

https://www.gasketnavi.com

Smartphone / tablet application version “Gasket NAVI”
click here to download
For iPhone users

For Android users

GASKET NAVI

* “GASKET NAVI” is a trademark of NICHIAS Corporation. * The contents described are subject to change without notice.

6

GAS K ET S

Sheet gaskets「GASKET工房」is a mobile service car that processes sheet gaskets.
We will go to your plant premises and process and deliver gaskets on the spot.
We will supply gaskets on the spot that are urgently needed due to unplanned
construction work caused by plant maintenance or troubles.
*This service is only available in Japan.

needs

Semi-metallic gaskets“Gasket Lab” is an engineering service that supports safe operation of plants
based on preventive maintenance. We support preventive maintenance througha cycle of “evaluation technology,” “verification technology,” and “experiential
learning.”

1
Search by competitor’s products

Metallic gaskets

Solving on-site
problems withthree solutions

Evaluation technology

Know the cause of leakage by incorporating sealing
technology and analysis technology.

For customers who want to prevent leaks and want to know the state of deterioration due to usage.
With the sealing technology cultivated through long experience and advanced analysis / analysis

Search by product number
You can browse product information such as service
temperature / pressure and standard dimensions.

Rubber gaskets

You can search for NICHIAS equivalents
by entering the product number of another manufacturer.

technology, we can identify the cause of leakage and contribute to preventive maintenance.

2

Evaluation technology

Keep a safe sealing according to the usage location.

For customers who want to improve leak-prone equipment and want a high degree of sealing. We
propose the optimum operation of gaskets based on computer simulation technology and abundant
experimental results.

Technical information

Technical data
You can browse the catalog, instruction
manual, and NICHIAS technical data.

Cloth gaskets

If you register as a member, you can view technicaldata such as compression / recovery characteristics.

CAE analysis(Computer Aided Engineering)

3 Experiential technology

Providing useful education at construction sites.

Learn the knowledge about gasket and flange
Pastes and other sealing materials

tightening from the principle, and practicetraining to deepen your understanding.

FAQ
We compiled commonly asked questions
on gaskets and packings from ourcustomers.

It is a system to monitor the tightened bolt axial force. It
can be used to judge the skill of flange tightening work.

GA S K E T S

7

Table of contents
Gasket solution service

GASKET LAB

6

TopicsWhen you want to check from the operating temperature and pressure

10

Precautions

For safe use

14

Sheet gaskets

Fluoropolymer gaskets

Expanded graphite gaskets

Semi-metallic gaskets
GAS K ET SGASKET工房

Selection method

Jointing sheets

8

GASKET NAVIVORTEX™ gaskets

CLINSIL™ Top

TOMBO™ No. 1120

18

CLINSIL™ Brown

TOMBO™ No. 1995

18

CLINSIL™ WhiteTOMBO™ No. 1995-W

18

CLINSIL™ SuperTOMBO™ No. 1993

19

CLINSIL™ NF

TOMBO™ No. 1991-NF

19

CLINSIL™ Next

TOMBO™ No. 1155

22

CLINSIL™ Clean

TOMBO™ No. 1133

23

NAFLON™ special carbon filler filled PTFE cut gasket

TOMBO™ No. 9007-SC

23

NAFLON™ PTFE low creep cut gasket

TOMBO™ No. 9007-LC

23

NAFLON™ glass fiber filled PTFE cut gasket

TOMBO™ No. 9007-G20

24

NAFLON™ PTFE cut gasket

TOMBO™ No. 9007

24

NAFLON™ ST cut gasket

TOMBO™ No. 9007-ST

24

SGM™ gasket

TOMBO™ No. 9096-SGM

24

NAFLON™ GL cut gasket

TOMBO™ No. 9007-GL

25

NAFLON™ ML cut gasket

TOMBO™ No. 9007-ML

25

NAFLON™ LP gasket

TOMBO™ No. 9007-LP

25

EZL™ gasket

TOMBO™ No. 9096-EZL

27

TriGuard™ gasket

TOMBO™ No. 9096-TRI

27

NAFLON™ PTFE envelope gasket

TOMBO™ No. 9010

28

NICHIAS SOFT SEAL™

TOMBO™ No. 9096

32

GRASEAL™ gasket

TOMBO™ No. 1200／1215-A／1210-A

34

CMGC gasket

TOMBO™ No. 1880-GR

35

GRASEAL™ Gasket Tape

TOMBO™ No. 1220／1221

35

GRASEAL™ VORTEX™ gasket

TOMBO™ No. 1834R-GR series

39

NA VORTEX™ gasket

TOMBO™ No. 1834R-NA series

39

VORTEX™ gasket-GS, -GM, -GH

TOMBO™ No. 1836R-GS, -GM, -GH series

40

VORTEX™ gasket -NM

TOMBO™ No. 1838R-NM series

40

GRASEAL™ VORTEX™ gasket-L

TOMBO™ No. 1839R series

41

GRASEAL™ VORTEX™ gasket-AL

TOMBO™ No. 1839RAL series

41

NAFLON™ VORTEX™ gasket

TOMBO™ No. 9090-IOR series

41

TOMBO™ No. 1891-GR, -TF, -NM

50

Metal jacketed gaskets

TOMBO™ No. 1841, 1861 series

54

Gasket for heat exchangers
Metallic gasket

Metallic gaskets

Sheet gaskets

Kammprofile gaskets

56

Pastes

Metallic gasket

TOMBO™ No. 1850P／1890

62

Metal O seal

TOMBO™ No. 9200 series

65

Rubber cut gasket

TOMBO™ No. 1050／1051

68

Rubber O ring/ BLAZER™ O ring

TOMBO™ No. 2670／2675

69

EBILON™ gasket

TOMBO™ No. 9013 series

70

SANICLEAN™ gasket

TOMBO™ No. 9014 series

71

Super Manhole gasket -ST, -S, -TH, -NA

TOMBO™ No. 1420-ST, -S, -TH／1400-NA

72

Manhole gasket

TOMBO™ No. 1374

72

NA gasket tape

TOMBO™ No. 1364

73

NA tadpole gasket tape

TOMBO™ No. 1368

73

NA tadpole gasket

TOMBO™ No. 1378

73

AQUA-TIGHT™ paste

TOMBO™ No. 9105

74

OIL-TIGHT™ paste

TOMBO™ No. 9106

74

NAFLON™ paste

TOMBO™ No. 9400

74

Fluorine grease

TOMBO™ No. 9401

74

SOFLEX™

TOMBO™ No. 4140, -NK

76

NAFLON™ Seal Tape

TOMBO™ No. 9082／9082-BL

77

METAKOTE™

TOMBO™ No. 1600

77

Rubber gaskets

Cloth gaskets

PastesOther sealing materials

Gasket tightening criteria and tightening method

78

JIS B2251: 2008 “Bolt tightening procedure for pressure boundary flanged joint assembly”

79

Types of flange

80

Guidelines of general gaskets selection

82

Rubber gaskets

Other sealingmaterials

60

Metallic gaskets

Cloth gaskets

TOMBO™ No. 1850C／1850V

Semi-metallic gaskets

Rubber gaskets

Ring joint gasket

Technical data

83

Gasket design criteria list

85

Index

87

Cloth gaskets

List of standard dimensions of gasket

Pastes and other sealing materials

GA S K E T S

9

選定方法

使 用 温 度 、圧 力 から 調 べ たい 場 合
4Selection
method以下にガスケットの選定例を示します。
ご使用の際の目安にご利用ください。
使
用 温 度 、圧 力 から
調 べ たい 場 合4
選定方法

以下にガスケットの選定例を示します。ご使用の際の目安にご利用ください。

Gasket recommendation based on usage temperature and pressure● この選定例は、流体、温度、圧力条件に対する代表的な推奨ガスケットを示したもので、使用可能なガスケットが全て記載されているものではありません。
●
流体、温度、圧力条件に対する代表的な推奨ガスケットを示したもので、使用可能なガスケットが全● この選定例は、
表中の流体、
温度、圧力は、
各ガスケットの最高使用条件を示したものではありません。
各ガスケットの使用て記載されているものではありません。
An example of selecting a gasket
is set outカタログ本文中の使用範囲をご参照ください。
below. Use it as a rough guide for selecting a gasket.
条件については、● TOMBO
表中の流体、
温度、圧力は、
各ガスケットの最高使用条件を示したものではありません。
各ガスケットの使用
No.1850C●（リングジョイントガスケット）は代表例として 316 鋼を記載しています。
ボルテック
条件については、
カタログ本文中の使用範囲をご参照ください。
スガスケットは内外輪付きの製品番号を記載しています。
This selection example indicates representative recommended gaskets for different fluid, temperature and pressure

TOMBO
No.1850C（リングジョイントガスケット）は代表例として 316 鋼を記載しています。ボルテック
conditions. Not all of the●gasketsareindicated here.
●usable
その他、
条件によっては使用できない場合もあります。
The fluid, temperature and スガスケットは内外輪付きの製品番号を記載しています。
pressure do not indicate the maximum conditions of use for each gasket. Regarding theconditions of use of eachrefer to the service range in the main text of catalogue.
●gasket,
その他、条件によっては使用できない場合もあります。
For TOMBO No. 1850C (ring joint gasket), the 316 steel type is shown as a representative example. VORTEX gaskets
are indicated using the TOMBO number that has inner and outer rings.
In addition, there may be cases in which specified gaskets cannot be used depending on the conditions.

[Type of fluid] Steam/hot water/water/salt water (brine)[Type of fluid] Steam/hot water/water/salt water (brine)
Working conditions

Temperature [˚C] Pressure [MPa]0.5 1.0 1.5 1.8 2.0 3.0 3.6 4.0

12

16

18

20

29

34

44

Working conditions

800˚C
Temperature [˚C] Pressure [MPa]
600˚C
800˚C
450˚C
600˚C
400˚C
450˚C
350˚C
400˚C

0.5 1.0 1.5 1.8 2.0 3.0 3.6 4.0

12

16

18

20

29

34

44

350˚C
215˚C
215˚C

175˚C
100˚C
175˚C

Room temperature
Room temperature

100˚C

0.5

1.0

1.5

1.8

2.0

3.0

3.6

4.0

12

16

18

20

29

34

44

0.5

1.0

1.5

1.8

2.0

3.0

3.6

4.0

12

16

18

20

29

34

44

Recommended gasket

Other usable gaskets(TOMBO No.)

page

TOMBO No.

Recommended
gasket60(316 stainless steel)
1850C-GTOMBO No.

1838R-NM
1850C-G (316 stainless steel)
1834R-GR
1838R-NM
1880-GR
1834R-GR
1834R-GR
1880-GR
1834R-NA
1834R-GR
1834R-GR
1834R-NA
1155
1834R-GR
1155
1155
1834R-GR
1155
1834R-NA
1834R-GR
1120
1834R-NA
1155
1120
1995
1155
1051-CR
1995

Other usablegaskets
1838R-NM/ 1891-NM

page
40
60
39

1051-CR

40
35
39
39
35
39
39
39
39
23
39
23
23
39
23
39
39
18
39
23
18
18
23
68
18

(TOMBO No.)

1850C-G / 1836R-GS, -GM, -GH
1838R-NM / 1891-NM
1836R-GS, -GM, -GH
1850C-G / 1836R-GS, -GM, -GH
1834R-GR / 1215-A / 1210-A
1836R-GS, -GM, -GH
1891-GR / 1850C-G
1834R-GR / 1215-A / 1210-A
1834R-GR / 1891-GR / 1850C-G
1891-GR / 1850C-G
1834R-NA / 1891-GR / 1850C-G
1834R-GR / 1891-GR / 1850C-G
1133 / 1120
1834R-NA / 1891-GR / 1850C-G
1834R-GR / 1834R-NA / 1880-GR / 1133
1133 / 1120
1891-GR / 1850C-G
1834R-GR / 1834R-NA / 1880-GR / 1133
1834R-GR / 1891-GR / 1850C-G
1891-GR / 1850C-G
1834R-GR / 1834R-NA / 1880-GR
1834R-GR / 1891-GR / 1850C-G
1834R-GR / 1880-GR / 1133 / 1120
1834R-GR / 1834R-NA / 1880-GR
1880-GR / 1155 / 1133 / 1120
1834R-GR / 1880-GR / 1133 / 1120
1155 /1133 / 1995 / 1880-GR
1880-GR / 1155 / 1133 / 1120

681155 /1133 / 1995 / 1880-GR

Gaskets for negative pressure lines
conditions
Gaskets forWorking
negativepressure lines
Temperature [˚C] Pressure [torr]

400˚C

300˚C
300˚C

Room temperature
Room temperature

0.1

Working conditions

Temperature [˚C] Pressure [torr]

400˚C

5

150˚C
150˚C
100˚C

5

0.1

0.01 Pressure [Pa]1.33

0.01 Pressure [Pa]

13.3
1.33
1.33
13.3
13.3
1.33
1.33
13.3
13.3
1.33
666
13.3
1.33
666
666
1.33

Recommended gasket

TOMBO No.

1850V

Recommended gasket

TOMBO No.

1834R-GR
1850V
9090-IOR
1834R-GR
1834R-GR
9090-IOR
9090-IOR
1834R-GR
1834R-GR
9090-IOR
1133
1834R-GR
1050
1133
1995
1050

100˚C
Unit of negative pressure / 1 torr = 1 mmHg =133 Pa, 1Pa = 7.50×10−3 torr = 7.50×10−3 mmHg

666

Other usable gaskets(TOMBO No.)

page

1995

60

Other usable gaskets
9200P-JAG

page
39

1850V

(TOMBO No.)

60
41
39
39
41
41
39
39
41
23
39
68
23
18
68

9200P-JAG
1850V

18

1050 / 1215T / 1993

1850V
9090-IOR / 850V
1850V
1850V / 9200V-JTF / 1133
9090-IOR / 850V
9090-IOR / 1850V / 9200V-JTF / 1133
1850V / 9200V-JTF / 1133
1834R-GR / 1120 / 1850V
9090-IOR / 1850V / 9200V-JTF / 1133
2670 / 1834R-GR / 1133
1834R-GR / 1120 / 1850V
1050 / 1215T / 1993
2670 / 1834R-GR / 1133

Vacuum guideline / low vacuum: 100 Pa or higher, medium vacuum: 100 ~0.1 Pa, high vacuum: 0.1〜10−5 Pa, ultra-high vacuum: 10−5 Pa or lower
Unit of negative pressure / 1 torr = 1 mmHg =133 Pa, 1Pa = 7.50×10−3 torr = 7.50×10−3 mmHg

10

Vacuum guideline / low vacuum: 100 Pa or higher, medium vacuum: 100 ~0.1 Pa, high vacuum: 0.1〜10−5 Pa, ultra-high vacuum: 10−5 Pa or lower
GAS K ET S

12 ─ 15[Type of fluid] Petroleum hydrocarbons (gasoline, naphtha, kerosene, heavy oil, LPG, etc.)/Alcohol/ Animal and mineral oil
Working conditions

Other usable gaskets

TOMBO No.

page

(TOMBO No.)

800˚C

1838R-NM

40

1850C-G / 1836R-GH / 1891-NM

1850C-G (316 stainless steel)

60

600˚C

450˚C

400˚C

260˚C

200˚C

0.5 1.0 1.5 1.8 2.0 3.0 3.6 8.0 9.0 11

17

18

21

23

26

29

34

60

1850C-G / 1836R-GS, -GM, GH

41 ─ 49

1834R-GR

39

1836R-GS, -GM, -GH

1215-A ／ 1210-A

34

1834R-GR / 1836R-GS, -GM, -GH

51 ─ 52

1850C-G (316 stainless steel)60

1834R-GR

39

1850C-G

53 ─ 54

1834R-NA

39

1834R-GR / 1891-GR / 1850C-G

1850C-G (316 stainless steel)60

1834R-GR

39

1850C-G

1834R-NA

39

1834R-GR1155

231120 / 1834R-GR / 1880-GR

1155

23

1133 / 1834R-GR / 1120

1850C-G (316 stainless steel)60

1834R-GR

39

1850C-G

1834R-NA

39

1834R-GR / 1850C-G

1155

23

1834R-GR / 1120 / 1880-GR

1995

18

1120 / 1834R-GR / 1880-GR

9007

24

1155 / 1133 / 1995

56 ─ 63

64 ─ 67

68 ─ 69

Metallic gaskets

Room temperature

100˚C

40

1850C-G (316 stainless steel)34 ─ 36

Semi-metallic gaskets

350˚C

1838R-NM

20 ─ 33

Sheet gaskets

Recommended gasket

Temperature [˚C] Pressure [MPa] 0.5 1.0 1.5 1.8 2.0 3.0 3.6 8.0 9.0 11 17 18 21 23 26 29 34 39 44

16 ─ 1970 ─ 71

39 44

Rubber gaskets[Type of fluid] Aromatic Hydrocarbons (benzene, toluene, xylene, etc.) / Organic solvent/ Thermal oils
Working conditions
Temperature [˚C] Pressure [MPa]0.5 1.0 1.5 3.0 3.6 9.0 11

Recommended gasket
17

18

21

23

26

29

34

39

44

600℃

450˚C

400˚C

260˚C

Room temperature

100˚C

0.5

1.0

1.5

3.0

3.6

9.0

11

17

18

21

23

26

29

34

39

(TOMBO No.)

1850C-G (316 stainless steel)

60

1838R-NM / 1891-NM

1838R-NM

40

1850C-G / 1838-GS, -GM, -GH

1850C-G (316 stainless steel)60

1834R-GR

39

1850C-G

1880-GR

35

1834R-GR / 1215-A / 1210-A / 1850C-G

1850C-G (316 stainless steel)60

1834R-GR

39

1850C-G (316 stainless steel)60

1834R-GR

39

1891-GR / 1850C-G

1834R-NA

39

1834R-GR / 1850C-G

1155

23

1834R-GR / 1880-GR / 1215-A

1155

23

1133 / 9007-SC / 1880-GR

1850C-G (316 stainless steel)60

1834R-GR

39

1891-GR / 1850C-G

1834R-NA

39

1834R-GR / 1891-GR / 1850C-G

1155

23

1834R-GR / 9007-LC / 9007-SC

9007

24

1155 / 1133 / 1120

1891-GR / 1850C-G

Pastes and other sealing materials

200˚C

page

Cloth gaskets

350˚C

Other usable gaskets

TOMBO No.

44

GA S K E T S

11

[Type of fluid] Weak acids (acetic acid, carbonic acid, etc.)/ weak alkalis (ammonia, etc.)/ Saline
Working conditions
Temperature [˚C] Pressure [MPa]Recommended gasket

0.5 1.0 1.5 1.8 3.0 4.6 9.0

11

260˚C

200˚C

Room temperature

100˚C

TOMBO No.

Other usable gaskets(TOMBO No.)

page

1834R-GR

39

1891-GR

1215-A / 1210-A

34

1834R-GR / 1891-GR

1133

23

1880-GR / 1215-A / 1210-A / 1120

9007-LC

23

1133 / 1834R-GR

1834R-GR

39

1133

23

1834R-GR / 1215-A / 1210-A

1995

18

1133 / 1880-GR / 1120

9007

24

1133 / 1880-GR / 1120

[Type of fluid] Strong acids (sulfuric acid, hydrochloric acid, nitric acid, etc.)
Working conditions
Temperature [˚C] Pressure [MPa]

0.5

1.0

1.5

Recommended gasket
1.8

3.0

9.0

11

260˚C

9090-IORNote 141Note 2239090-IOR

23

Note 29007-LCNote 3
100˚C

Note 1
Note 11133/ 9090-IOR

9090-IORNote 141Note 2239090-IOR

23

Note 21133/ 9090-IOR

24

1133

Note 2/ 9090-IOR

1133

Room temperature(TOMBO No.)

page

1133
200˚C

Other usable gaskets

TOMBO No.

9007-LC

Note 39007

Note 1
Note 1
Note 1

Note 1: Select a metal material that is resistant to fluid.
Note 2: Cannot be used for chromic acid.
Note 3: Cannot be used for chromic acid and hydrofluoric acid.

[Type of fluid] Strong alkalis (caustic soda, caustic potash)
Working conditions
Temperature [˚C] Pressure [MPa]

0.5

1.5

1.8

Recommended gasket
3.0

4.6

9.0

11

260˚C

200˚C

1834R-GR

39

1891-GR

1215-A / 1210-A

34

1834R-GR / 1891-GR / 1880-GR

9007-SC

23

1834R-GR / 1880-GR / 1215-A / 1210-A

Note 423

1834R-GR / 9007-SC / 1215-A / 1210-A

39

1834R-NA

1133

23

1834R-GR / 1834R-NA / 1215-A / 1210-A

9007-SC

23

1133 / 1834R-GR / 1120

9007

24

1133 / 1834R-GR / 9007-SC

1834R-GR

Room temperature

100˚C(TOMBO No.)

page

1133

120˚C

Other usable gaskets

TOMBO No.

Note 4: Use at a concentration of 30% or less.

[Type of fluid] Air
Working conditions
Temperature [˚C] Pressure [MPa]

600˚C
300˚C
260˚C
Room temperature

200˚C
100˚C

Note 5: Use gasket paste

12

GAS K ET S

0.3

0.5

Recommended gasket
1.0

1.5

5.0

Other usable gaskets(TOMBO No.)TOMBO No.

page

1841-FI-GNote 5

54

1838R-NM / 1891-NM

1834R-GR

39

1841-FI-G

1155

23

1133 / 1834R-GR / 1880-GR / 1120

1215-A / 1210-A

23

1880-GR

1995Note 5181155 / 1133 /1834R-GR / 1050 series

9007

24

1155 / 1133 / 1834R-GR / 1995

Note 5/ 1891-GR / 1850C-G

Note 512 ─ 1516 ─ 19[Type of fluid] Exhaust gas
Working conditions

1.0

700˚C
500˚C
300˚C
Room temperature

260˚C
200˚C
100˚C

20 ─ 33

Other usable gaskets

Sheet gaskets

Recommended gasket
0.01

Temperature [˚C] Pressure [MPa](TOMBO No.)TOMBO No.

page1420-STNote 6721420-S

1420-THNote 6721420-ST

1374Note 6721420-ST

1155

23

1133

1120

18

1155 / 1133 / 1834R-GR

1995

18

1155 / 1133 / 1834R-GR / 1120

Note 6Note 6/ 1420-S

Note 6Note 6/ 1420-TH

Note 634 ─ 36/ 1400-NA

Note 6Note 6/ 1400-NA

41 ─ 49

51 ─ 52

Semi-metallic gaskets

Note 6: Use at locations where a certain amount of leakage is tolerated.

53 ─ 54

56 ─ 63[Type of fluid] Combustible gas/ Toxic gas/ Hydrogen gas/ Ammonia
Working conditions
Temperature [˚C] Pressure [MPa]

0.5

1.0

1.5

5.0

6.0

9.0

Recommended gasket
17

18

21

23

29

34

39

600˚C
450˚C

200˚C
100˚C
0.5

1.0

1.5

5.0

6.0

9.0

21

23

29

34

(TOMBO No.)

1850C-G (316 stainless steel)

60

1838R-NM / 1891-NM

1850C-G (316 stainless steel)

60

1838R-NM / 1891-NM

1834R-GR

39

1850C-G

1850C-G (316 stainless steel)60

1834R-GR

39

1891-GR / 1850C-G

1834R-NA

39

1834R-GR / 1891-GR / 1850C-G

1850C-G (316 stainless steel)60

1834R-GR

39

1891-GR / 1850C-G

9090-IOR

41

1834R-GR / 1891-GR / 1850C-G

1834R-NA

39

1834R-GR / 9090-IOR / 1891-GR

1155

23

1133 / 1834R-GR / 9090-IOR

9007-LC

23

1133 / 1834R-GR / 9090-IOR

9007

24

1155 / 1133 / 1834R-GR / 9007-LP

17

18

39

TOMBO No.

page

1850C-G (316 stainless steel)60

64 ─ 67

68 ─ 69

70 ─ 71

Rubber gaskets

Room temperature

260˚C

page

Metallic gaskets

350˚C

Other usable gaskets

TOMBO No.

39

[Type of fluid] Oxygen gas
Working conditions
Temperature [˚C] Pressure [MPa]

1.0

2.0

9.0

Recommended gasket
11

20

100˚C

(TOMBO No.)

Cloth gaskets

260˚C

Other usable gaskets

9090-IOR-OX

41

1133

23

9090-IOR-OX

1133

23

9007-LC / 9090-IOR-OX

Pastes and other sealing materials[Type of fluid] Low temperature fluid/ Liquefied gas/ LNG/ LN 2 / LO2 / Ethylene
Working conditions
Temperature [˚C] Pressure [MPa]

1.0

2.0

9.0

Recommended gasket
11

20

39

TOMBO No.

Other usable gaskets(TOMBO No.)

page

−200˚C

1133

23−270˚C

1834R-GR

39

1839R

41

1120-LN / 1839R

GA S K E T S

13S a fet y p r e c a u t i o n s
Please observe the following items in order to maintain theoriginal functions of the gaskets in this catalog and use them safely.

Common precautions for handling the products listed in this catalog
The physical characteristics, application selection, range of use, etc. described in this catalog are typical.
In addition, the performance data is based on our test results and achievements in general applications.
Since this product is used in various places and equipment and the actual usage conditions are also
different, it is recommended to carry out a confirmation test under the actual conditions when using it.
For individual applications, it is necessary to judge the selection after evaluating individual design andcompatibility. Please contact us for special applications.
・Do not use for any purpose other than those listed in the catalog.
・Use products within the service temperature range specified in the catalog.
・When processing, use sharp cutting tools.
・Always follow the instructions in the instruction manual when installing equipment, etc.
・Do not reuse the gaskets.
・When replacing, carefully remove all of the old material before installing the new product.
・Store products indoor at ordinary temperature and humidity, and strictly avoid to get wet.
・Check the precautions for occupational health using the SDS.
・For disposal, follow local regulations.

Precautions for handling GRASEAL™ Gasket
Since there is high risk of causing deformation and/or scratch damage on this product, pay enough attention to thefollowing handling precautions.
If deformation and/or scratch damage is caused on the surface of the product, original performance may not be
maintained.
・Do not place heavy items on the product.
・Do not hit GRASEAL™ product on a hard item.
・Do not step on the product nor bend the product.
・When a cutter knife, etc. is used to open a package, be careful not to damage the product.
・Do not pick up the product before completely opening the package.
・Wear the protection glove in order not to be hurt, when reinforcing metal sheet is exposed on the edge.

Precautions for handling Manhole Gasket
・Wear the protection glove in order not to be hurt, when reinforcing metal sheet is exposed on the edge.

Precautions for handling Jointing Sheet
・The surface sometimes becomes white, but this has no effect on performance.
・Recommended gasket paste TOMBO No.9105, 9106, or 9400. Please consult us when using any other paste.

Precautions for handling fluoropolymer gaskets

DANGER
Never allow the product to come into direct contact with body tissues or fluids.
Never administer (including by mistake) to humans.

・In cases when using or processing the product at above the maximum service temperature, fluorinated gas will be
generated. The room must be adequately ventilated so as to prevent inhalation of gas.

14

GAS K ET S

Product1

Sheet gaskets
NICHIAS has sheet gaskets such as jointing sheets, fluoropolymer gaskets, and expanded graphite (GRASEAL®) gaskets, which are used at relatively low temperatures and low pressures.
Sheet gaskets
Semi-metallic gaskets
Metallic gaskets
Rubber gaskets

Jointing sheets

Fluoropolymer gaskets
A sheet gasket based on
fluoropolymer such as
PTFE, which has excellent
heat resistance and chemical resistance.

P18-P21

P22-P33

Cloth gaskets

A highly versatile gasket
that can be processed into
the required dimensions
and shape with a sheet
gasket that is made bymixing rubber, fiber, andfiller kneaded together andthen rolled using a roller.

Pastes and other sealing materials

Expanded graphite gaskets
A cut gasket made fromexpanded graphite sheet
which has excellent heat
resistance and pressure
resistance.

P34-P36GA S K E T S

15Sheet gaskets

When ordering When ordering, please specify the product number (TOMBO No.) and the following.
Shape

Item
ThicknessSheetlengthPlease specify the shape of the gasket.

Cut gasket

For complicated shapes, please specify in the drawing.

Shape

How to specify gasket dimensions
Standard size

Ring gasket(Gasket for raised face)Non-standard sizeStandard size
Full-face gasket(Gasket for flat face)Non-standard size

short inner sidewidth

For example) 1.5t × 1270 × 1270 For example) 1.5t × 1Slong inner side

Frame-shaped

Pressure class x nominal size x thickness
For example) 10K × 50A × 1.5T × RF、150LB × 2B × 1.5T × RF

inner diameter X outer diameter X thickness
For example) 60φ × 100φ × 1.5T

Pressure class x nominal size x thickness
For example) 10K × 50A × 1.5T × FF、150LB × 2B × 1.5T × FF

Inner diameter x outer diameter x PCD X n-h X thickness
For example) 60φ × 130φ × PCD105 × 4n-12φ × 1.5T

Thickness x short inner side / long inner side x short outer side / long outer side
For example) 1.5T × 50/150 × 70/170

long outer sideOval

For heat exchangers

Blind (BF)

Eclipse x Thickness x Short outer diameter x Long outer diameter x Width
For example) Oval × 1.5T × 100 × 130 × 10W

Inner diameter x outer diameter x thickness x rib width-rib R x rib shape
For example) ○○φ × ○○φ × ○T × ○○W-○○R × HE○

Blind x outer diameter x thickness
For example) blind × 105φ × 1.5T

Standard size
With handle
Non-standard size

Handle x pressure x nominal size x thickness x rib shape
For example) Tab × 〇〇K × 〇〇A × 〇T × RF × 〇W × 〇L × 〇R

Handle x inner diameter X outer diameter X thickness x rib shape
For example) Tab × 〇〇φ × 〇〇φ × 〇T × 〇W × 〇L × 〇R

one-point
The ring gasket set inside the bolt has a high surface pressure, so it has good sealing performance, and the full-face gasket with bolt holes has theadvantage of being easy to set and difficult to tighten on one side.

Gasket thickness
The thinner the sheet gasket, the better the sealing
performance and stress relaxation performance. The
thicker the sheet gasket, the better the absorption offlange warping. Basically, we recommend 1.5mm forsmall and medium nominal size of 150A or less, and3.0mm for medium and large nominal size of 200A or
more.

16

GAS K ET S

fluidnominal size

tickness

150A (6B) and below

1.5mm

200A (8B) and above

3.0mm

gas type

all size

1.5mm and below

steam / hot water line

all size

1.5mm

water oil typeSheet gaskets

Sheet gaskets

Case study
Q. Why does the allowable seating stress decrease when paste is used for the jointing sheet?
A. This is because the paste reduces the frictional force with the flange and the jointing sheet is easily to deform.
When the jointing sheet is tightened, the internal voids are

Figure 1 With and without paste
Schematic diagram when the paste is applied too muchcompressed and the thickness becomes thinner, and at theWithout paste

the deformation is usually suppressed by the frictional force

When too much paste is applied
flangewith the flange, but if slippery material such as gasket paste

Semi-metallic gaskets

same time, it tries to deform in the radial direction. Therefore,

flangeintervenes, the frictional force between the jointing sheet andthe flange becomes small and the deformation cannot begasketgaskettolerated and destroyed.
Therefore, when paste is used, the allowable seating stress ofpaste

the jointing sheet (Jointing sheet will be damaged if applied

Fig. 3 Estimated amount of paste applied

350
300

294.2

250

196.1

200

Rubber gaskets﹇ N/mm﹈2
Allowable seating stressFig. 2 Allowable seating stress when applying paste(TOMBO No.1120)

Slippery (easy to deform)

Metallic gaskets

Friction works (hard to deform)

seating stress high than allowable value) is reduced.

150

98.0

100

68.6
50
0

0.8t

1.5t
Without paste

3.0t

All thickness
With paste(In the case of TOMBO No.9400 NAFLON paste)

As an example, Fig. 2 shows the allowable seating stress at room temperature with and without the paste of TOMBO No. 1120. If
Cloth gaskets

there is a paste, the allowable seating stress will be smaller. Therefore when using a paste, apply it thinly and evenly as shown by the“○” mark in Fig. 3. The “X” mark shown in Fig. 3 is too thick.

For other case studies, see “FAQ” of Gasket NAVI.

Pastes and other sealing materials

The jointing sheet
cracked in thecircumferential direction
and was damaged. What
could be the cause?

GA S K E T S

17Jointing sheets
A jointing sheet is a sheet gasket consisting of rubber, fibers and filler which are kneaded together and then rolled using a roller.
It is formed to the necessary dimensions and shape and is used at joints of utility piping and equipment.

CLINSIL™ Top
Fluid pressure［MPa］

1120

TOMBOTM No.

Service range
Water type fluid
Oil type fluidGas type fluidNote 1

120℃

4.0

120℃

3.0
50℃

215℃

2.0

260℃
260℃

1.0

Note 1: For this area, pleaseconsider carefully inadvance before use.

−200

−100

−29 0

100

200

300

Temperature [°C]

Features

Since it is mainly composed of expanded graphite, it has excellent heat resistance, steam resistance, and corrosion resistance.
It is not easily scratched and has excellent flexibility.

Used for relatively high temperature flanges, valves and equipment.

Main constituents: NBR, aramid fibers, expanded graphite
Line-up: TOMBO No.1120-LN For low temperature fluids such as LNG. Product with special treatment for TOMBO No.1120

1995

TOMBOTM No.

CLINSIL™ Brown
Service range
Note 2

Oil type fluid
Fluid pressure［MPa］

Fluid pressure［MPa］

Water type fluid
4.0
3.0
2.0

183℃

1.0
−100 −29 0

100

200

4.0
3.0
2.0
183℃
180℃
183℃
180℃

1.0
−100 −29 0300

Gas type fluid

100

Temperature [°C]

200

300

Temperature [°C]

Note 2: The guideline for the usage period when used as a piping gasket for steam seals of 100°C or higher is as follows. Area: 1-2 years
Features

Standard grade jointing sheet

Large size gasket is available. Can be manufactured without joints to a maximum of 3810mm x 3810mm (9S size)

Can be used with relatively low temperature flanges, valves and equipment.

Main constituents: NBR, aramid fibers, inorganic fibers

1995-W

TOMBOTM No.

CLINSIL™ White
Service range
Oil type fluid
Fluid pressure［MPa］

Fluid pressure［MPa］

Water type fluidNote 3
4.0
3.0
2.0
183℃

1.0
−100 −29 0

100

200

300

Gas type fluid

4.0
3.0
2.0
183℃
180℃
183℃
180℃

1.0
−100 −29 0100

Temperature [°C]

Features

Note 3: The guideline for the usage period when used as a piping gasket for steam seals of 100°C or higher is as follows. Area: 1-2 years

A white jointing sheet with the same performance as TOMBO No.1995.
Suitable for places where you want to avoid black foreign matter entering the fluid.

Main constituents: NBR, aramid fibers, inorganic fibers

18

GAS K ET S

200

300

Temperature [°C]

Sheet gaskets

Sheet gaskets

1993

TOMBOTM No.

CLINSIL™ Super
Service range
Note 4

Fluid pressure［MPa］

Oil type fluid

4.0
3.0

120℃

2.0

215℃
183℃

1.0
−100 −29 0

100

200

300

Gas type fluid

4.0
3.0
2.0

Semi-metallic gaskets

Fluid pressure［MPa］

Water type fluid

200℃

1.0
−100 −29 0100

Temperature [°C]

200

300

Temperature [°C]It has excellent heat resistance, steam resistance and issuitable for steam lines.

Main constituents: Specially blended rubber, aramid fibers, inorganic filler

Metallic gaskets

1991-NF

TOMBOTM No.

Do not use TOMBO No. 1993 for gas-based fluids that cannot
tolerate even the slightest leak. If you want to perform an airtight testwith water / oil fluid, please use paste together. Alternatively, we
recommend using TOMBO No.1133 and TOMBO No.1120.

CLINSIL™ NF
Service range
Water oil type fluidGas type fluid

Fluid pressure［MPa］

Features

Note 4: The guideline for the usage period when used as a piping gasket for steam seals of 100°C or higher is as follows. Area: 1-2 years

4.0
180℃

3.0
2.0

180℃

1.0

−29 0

100

200

Rubber gaskets

−100

300

Features

Temperature [°C]It has high resistance to alternative CFCs and is suitable for equipment that uses CFC substitutes (HCFC, HFC, etc.)
such as refrigerator compressors.

Main constituents: NBR, aramid fibers, special inorganic filler

Cloth gaskets
Pastes and other sealing materials

GA S K E T S

19Jointing sheets
Design criteria
TOMBO No.

1120

Gasket factor m [—]Minimum design seating stress y [N/mm2]
Minimum seating stress σ3 [N/mm2]

3.50

1.5 t

2.75

3.0 t

2.00

0.8 t

44.8

1.5 t

25.5

3.0 t

11.0

Water oil type fluid

14.7

gas type fluid

34.3Note 1

0.8 t

without paste

Allowable

1995

0.8 t

294.2

1.5 t

196.1

3.0 t

seating stress

1993

98.0

Note 1: We do not recommend athickness of 3.0t for gasbased fluids.
Note 2: 58.8N/mm2 when used with
anticorrosion paste.

147.1

0.8 t

[N/mm2]

with paste

68.6Note 2

1.5 t
3.0 t

Standard dimensions
TOMBO No.

1S (1270 × 1270mm)

3S (1270 × 3810mm)

6S (2540 × 3810mm)

9S (3810 × 3810mm)

1120

1995

1995-W

1993

1991-NF

0.4 t

●

─

─

─

●

0.5 t

●

─

●

●

●

0.8 t

●

●

●

●

●

1.0 t

●

●

●

●

●

1.5 t

●

●

●

●

●

2.0 t

●

●

●

●

─

3.0 t

●

●

●

●

─

0.4 t

●

─

─

─

●

0.5 t

●

─

●

●

●

0.8 t

●

●

●

●

●

1.0 t

●

●

●

●

●

1.5 t

●

●

●

●

●

2.0 t

●

●

●

●

─

3.0 t

●

●

●

●

─

0.8t

●

●

─

─

─

1.0 t

●

●

●

─

─

1.5 t

●

●

●

─

─

2.0 t

●

●

●

─

─

3.0 t

●

●

●

─

─

0.8 t

─

─

─

─

─

1.0 t

─

─

─

─

─

1.5 t

─

●

─

─

─

2.0 t

─

●

─

─

─

3.0 t

─

●

─

─

─

3.63

4.35

4.35

4.23

3.75

Weight (kg) per sheet of thickness 1.5t and 1S size (reference) [kg] (reference)* The above are standard dimensions. We can also manufacture some sheets that are not marked. For details, please contact us.

Typical physical properties
1120

1995

1993

Sample thickness

TOMBO No.
[mm]

1.5

1.5

1.5

1.0

Tensile strength[N/mm2]

27.5

24.1

14.7

26.2

Compressibility

[%]

Recovery[%]
IRM903 oil
150˚C×5h

Oil resistanceResistance to fuel oil

IRM903 oil
40˚C×48h
ASTM Fuel B(JIS fuel oil B)
R.T.×5hStress relaxation ratio
Density[%]

34.3N/mm2

9

7

7

6

70

65

52

67

thickness increase ratio [%]

2

3

24

1

tensile strength reduction ratio [%]

11

23

33

−1

thickness increase ratio [%]

─

4

─

1

tensile strength reduction ratio [%]

─

4

─

6

compression ratio

[%]

─

6

─

6

recovery

[%]

─

64

─

73

thickness increase ratio [%]

2

4

18

3

mass increase ratio [%]

1

6

17

5

100˚C × 22h[g/cm3]

25

28

20

15

1.53

1.84

1.71

1.62

* The above values are measured value. They are not standard values.

20

GAS K ET S

1991-NF

Measured by: NICHIAS

シ ー ト ガ ス ケ ット

Sheet gaskets

Precautions concerning jointing sheets
Gasket contact surface finish
The recommended surface roughness when using a jointing
sheet is as follows.
・For sealing liquid: 6.3μm Ra or below
・For sealing gas: 3.2μm Ra or below

Nominal diameter

ThicknessShape

max 150A（6B）

1.5mm

─

min 200A（8B）

3.0mm

─

Gas type

all sizes

max 1.5mmNote 2ring shapedNote 3

Steam and hot water lines Note 1

all sizes

1.5mm

ring shapedNote 3

Note 2: It is recommended that a thin gasket to prevent permeation leakage.
Note 3: If the FF shape does not provide sufficient seating stress, it isrecommended to use a ring shape with the gasket inside the bolt.

Gasket shape
Gasket- Although TOMBO No.1120 can be retightened, retightening (hotbolting) is not possible when the temperature is high because
the allowable seating stress decreases at high temperatures.

To prevent compressive breakage
To prevent compressive breakage of the jointing sheet,strictly observe the following items.
Do not overtighten- Do not tighten the gasket more than the allowable seating stress.
∙ Tighten with a uniform force.

Metallic gaskets

Note 1: Recommended when TOMBO No. 1995 is used in a steam or hot waterline at 100°C or higher or when TOMBO No. 1993 is used in a steam or
hot water line at 120°C. use a VORTEX gasket or a kammprofile gasket
in a location where maintenance is difficult to carry out.

- For TOMBO No. 1995 and TOMBO No. 1993, the gasket
will harden over time after the temperature rises therefore
retightening is not possible.

Semi-metallic gaskets

The recommended thickness and shape of jointing sheets
are as follows.

water type and oil typeCompared to an asbestos jointing sheet, a non-asbestos
jointing sheet contains only a small amount of soluble
halogen. Therefore it can also be used with stainless steel
flanges as well. There is no need to use anti-corrosion paste.

Additional tightening

Recommended thickness and shape of gasket

fluidsUsing a jointing sheet between stainless steel flanges

Sheet gaskets
ジョ
イントシートPrecautions concerning design and selection(Please note that if the load is easily applied to a part of the gasket by
one-sided tightening, compression breakage may occur even if theseating stress is less than the allowable tightening surface pressure.)∙ In the case of small I.D. flange, a large tightening force
may be applied to the gasket therefore be careful not
to overtighten.W36
Precautions when using gasket paste∙ Recommended gasket paste
TOMBO No. 9105, 9106, 9400
*Please consult us when using any paste other than the above

Bolt hole

Ring shape

Precautions for use

Rubber gaskets

FF shape∙ Unusable gasket paste
Do not use the following pastes as they may cause
compressive breakage below the allowable seating stress.
Solvent-based liquid gasket (it may swell the gasket)
Silicone oils and greases (promotes gasket slippage)
Tightening gasket at high temperature (hot bolting)
Hot bolting may cause compressive breakage eventhough below the allowable seating stress.

For gas-based fluids
The surface may turn white but there is no
problem with performance.

Cloth gaskets

A jointing sheet consists of fibers, filler and rubber which are
kneaded together and then rolled. It has a structure with many
voids inside. Since gas-based fluids are prone to permeation
leakage, please note the following points when using.
- Apply gasket paste thinly and evenly to the seating surfaces and inner periphery.
- Apply sufficient seating stress.
- Before carrying out an air tightness test, install the gasket withpaste and leave it for 2 to 3 hours to allow it to bond with the flange.

Applicable standards

For Steam or hot water line

JIS F 0602
“Shipbuilding - Non-asbestos gasket to cargo piping system - Application standard”(HJ TOMBO No.1995, TOMBO No.1993, TOMBO No.1991-NF, TOMBO No.1938)

When using TOMBO No. 1995 for steam / hot water lines at
100°C or higher and TOMBO No. 1993 at 120°C or higher,
the seating stress should be 29.4N/mm2 or higher and be
careful not to apply piping stress to the gasket.

Pastes and other sealing materials- Do not use a jointing sheet as a seal for a toxic gas line or a highvacuum line or combustion promoting gas (oxgen) that cannot
tolerate even a small amount of leakage.

JIS F 7102
“Standard for Using Gaskets and Packing for Pipes in Marine Engines”(HJH TOMBO No.1995, HJT TOMBO No.1993)

GA S K E T S

21

Fluoropolymer gaskets

1155

TOMBOTM No.

Service range
Water type fluid
Oil type fluidGas type fluid

Fluid pressure［MPa］

CLINSIL™ Next
4.0
3.0
2.0
1.0

−200

−100

−29 0

100

200

300

Temperature [°C]

FeaturesC an be used for utility applications such as high-temperature water, oil, steam, various organic solvents, low-temperature fluids, flammable gas, inert
gas, and non-combustible gas. (Can also be used for some alkaline / acid fluids)
Creep at high temperature is small and can be used at high temperature. It can be used for a long time with little deterioration at high temperatures.

Main constituents: PTFE, silica, graphite

Positioning of our sheet gasket
High

Utility use(Water, oil, steam, etc.)

Chemical resistant use(Acid, alkali, etc.)

Heat resistant

TOMBO No.1155

TOMBO No.1133

low

TOMBO No.1120

Poor

Chemical resistant

Excellent

310°C thermal cycle seal test result
TOMBO No.1155 has high thermal resistance and exhibits sealing performance even at 300°C.
Test condition

Test result

Sample dimension
FlangeSeating stress

JIS 10K 25A FR 3.0t

Number of test

n=3

Number of cycles

Leakage*2

JIS 10K 25A FR

Leak detection

Pressure drop

1

No

Heating condition
No. of heat cycles

310˚C*1 × 18hours
10 cycle

2

No

3

No

4

No

5

No

〜10

No

2

34.3N/mm

Fluid

N2 gasInternal pressure

0.98MPa

18 hours

18 hours

18 hours

18 hours

1 cycle2 cycle3 cycle10 cycle

310˚C

Measured by: NICHIAS

Room
temperature
Seal test

Seal test

Seal test

Seal test*1 This evaluation is measured at 310°C, which exceeds the maximum operating temperature as an accelerated deterioration test. We do not guarantee theuse of 310°C.
*2 L
 eakage-free standard: 0.12 ml/min
3
JIS B 2490-2008 “Test method for sealing behavior of gaskets for pipe flanges” The leak amount 3.0 × 10-4 Pa・m /s that can be detected by the soapy
water foaming method described in Section 7 “Quantification of non-leakage” is converted to the leak amount at the sample size JIS 10K 25A.
*3 This is an actual measurement value, not a standard value.

22

GAS K ET S

Sheet gaskets

A gasket based on fluoropolymer, which has excellent heat resistance and chemical resistance. Gaskets containing a filler suchas alumina are less likely to creep when heated than gaskets containing only PTFE because the filler suppresses deformation.
Sheet gaskets

1133

TOMBOTM No.

CLINSIL™ Clean
Service range
Fluid pressure［MPa］

Oil type or corrosive fluid

4.0
3.0

175℃

−29℃

2.0

215℃

1.0
−200 −100 −29 0

100

200

300

Temperature［℃］

Gas type

4.0
100℃

3.0
2.0

260℃

1.0

Semi-metallic gaskets

Fluid pressure［MPa］

Water type fluid

260℃−200 −100 −29 0

100

200

300

Temperature［℃］

The area marked with * is the range that can be used depending on the conditions. Please be sure to consult us in advance.

Features* Since the amount of deformation due to creep increases as the thickness increases, we recommend a gasket thickness of 1.5mm for gas lines exceeding 200°C.

Can be used for a wide range of fluids such as acids/alkalis, petroleum / petrochemical products, organic solvents, hot oils, heating medium gases, and steam. (excluding some strong alkalis and strong acids)
It has the highest chemical resistance compared to other fluoropolymer gaskets.

Can also be used where electrical insulation is required.

Main constituents: PTFE, alumina

9007-SC NAFLON™ special carbon filler filled PTFE cut gasket
water.oil, corrosive fluids
Gas type

Fluid pressure［MPa］

Service range

4.0
3.0
2.0
1.0

−200

−100

−29 0

100

200

300

Rubber gaskets

Features* When using the welded productof TOMBO No.9007-SC for agas-based fluid or when
performing an airtightness test,
please use together with paste.

Metallic gaskets

TOMBOTM No.

Temperature［℃］ an be used mainly for strong alkaline fluids. (Cannot be used for oxidizing fluids such as nitric acid, concentrated sulfuricCacid, and chromic acid)

Main constituents: PTFE, carbon

NAFLON™ PTFE low creep cut gasket
Service range
Gas type

4.0

Cloth gaskets

water.oil, corrosive fluids

Fluid pressure［MPa］

9007-LCTOMBOTM No.

3.0
2.0
1.0

−200

−100

−29 0

100

200

300

Features

Pastes and other sealing materials

Temperature［℃］

Can be used mainly for strong acid fluids. (Cannot be used for hydrofluoric acid and strong alkali).
Can be used where electrical insulation is required.

Main constituents: PTFE, silica
Information
Creep is the deformation that occurs to a material after exposed to a certain temperature and stress after a certain amount of time. Creep at room
temperature is also called “cold flow”.
GA S K E T S

23

Fluoropolymer gaskets
NAFLON™ glass fiber filled PTFE cut gasket
Fluid pressure［MPa］

9007-G20

TOMBOTM No.

Service range
water.oil, gas, corrosive fluids

4.0
3.0
2.0
1.0

−100

−29

0

100

200

300

Temperature［℃］

Features

Standard filler filled PTFE gasket.
Cannot be used for hydrofluoric acid and strong alkali.

Main constituents: PTFE, glass fiber

TM

NAFLON™ PTFE cut gasket
NAFLON™ ST cut gasket
Service range
TOMBO No.9007
(water.oil, gas, corrosive
fluids)TOMBO No.9007-ST(water.oil, gas, corrosive
fluids)Fluid pressure［MPa］

9007
TOMBO No.9007-ST
TOMBOTM No.

4.0
3.0
2.0
1.0

−100

−29 0

100

200

300

Temperature［℃］

Features

Since it does not contain filler, it can be used for lines that contamination is not allowed.
Can also be used where electrical insulation is required.

Main constituents: TOMBO No.9007: PTFE TOMBO No.9007-ST: Modified PTFESGM™ gasket
Service range
water.oil, corrosive fluids
gas type fluids

Fluid pressure［MPa］

9096-SGM

TOMBOTM No.

4.0
3.0
215℃

2.0
200℃

1.0

−200

−100

−29 0

100

200

300

Features

Temperature［℃］

It is very flexible.

Since it does not contain filler, it can be used for lines that contamination is not allowed.

Can also be used where electrical insulation is required.

Main constituents: ePTFE
When using TOMBO No.9096-SGM for gas-based fluids
Ring shape (FR type) gasket is recommended. (Because the seating stress may be insufficient for the FF type)
It is recommended to use TOMBO No.9400 (NAFLON paste) together to improve the sealing performance.
Information
Modified PTFE is a PTFE whose chemical structure has been partially changed.
It has better creep resistance than general PTFE and can be used at higher temperatures.
ePTFE is made porous by expanded, it has excellent flexibility and cushioning properties.

24

GAS K ET S

Please use TOMBO No.9096SGM only for general industrialuse.
It cannot be used in the manufacturing,processing and packaging processesof foods, pharmaceuticals, cosmetics
and pharmaceutical equipment.

Sheet gaskets

NAFLON™ GL cut gasket
Service range
Gas type fluids

4.0

Sheet gaskets

water.oil, corrosive fluids

Fluid pressure［MPa］

9007-GLTOMBOTM No.

3.0
2.0
1.0

−200

−100

−29 0

100

200

300

Semi-metallic gaskets

Features

Temperature［℃］Due to its high flexibility, it is suitable for places where high seating stress cannot be applied such as glass lining pipes
and plastic pipes.

Main constituents: PTFE, silica filler
When using TOMBO No.9007-GL for gas-based fluids
Ring shape (FR type) gasket is recommended. (Because the seating stress may be insufficient for the FF type)
It is recommended to use TOMBO No.9400 (NAFLON paste) together to improve the sealing performance.

Service range
water.oil, gas, corrosive fluids

Fluid pressure［MPa］

NAFLON™ ML cut gasket
Metallic gaskets

9007-MLTOMBOTM No.

4.0
3.0
2.0
1.0

−100

−29

0

100

200

300

Features

Gasket suitable for monomer line.

Rubber gaskets

Temperature［℃］

In a radical polymerization environment, the monomer fluid permeates and stays in the gasket,

suppresses the “popcorning phenomenon” that breaks due to volume expansion and exhibits stable sealing properties for a long period of time.

Main constituents: PTFE, special additives

NAFLON™ LP gasket
Service range

4.0

Cloth gaskets

water.oil, gas, corrosive fluids

Fluid pressure［MPa］

9007-LPTOMBOTM No.

3.0
2.0
1.0

−100

−29

0

100

200

300

Features

Pastes and other sealing materials

Temperature［℃］

Since it has less penetration of chemicals and gases than PTFE, it is suitable for highly permeable halogen-based fluids.

Main constituents: PFAGA S K E T S

25

Fluoropolymer gaskets
Design criteria
TOMBO No.
Gasket factorm [─]Min. design
seating stress y[N/mm2]

Min. seating stress

σ [N/mm ]2

3

Allowable seating stress

1133

1155

9007-SC

9007-LC

9007-G20

9007

9007-ST

9096-SGM

9007-GL

9007-ML

9007-LP

1.0 t

3.50

─

─

3.50

3.50

3.50

─

2.50

─

─

─

1.5 t

2.75

2.75

3.20

3.20

3.20

3.20

3.20

2.50

─

3.20

─

2.0 t

2.75

2.75

3.00

3.00

3.00

3.00

3.00

2.50

─

─

3.00

3.0 t

2.00

2.00

2.50

2.50

2.50

2.50

2.50

2.50

2.50

2.50

─

1.0 t

44.8

─

─

24.5

24.5

24.5

─

19.6

─

─

─

1.5 t

25.5

25.5

22.5

22.5

22.5

22.5

22.5

19.6

─

22.5

─

2.0 t

25.5

25.5

19.6

19.6

19.6

19.6

19.6

19.6

─

─

19.6

3.0 t

11.0

11.0

19.6

19.6

19.6

19.6

19.6

19.6

19.6

19.6

─

Water.oil type fluids

14.7

14.7

14.7

14.7

12.7

10.8

10.8

19.6

14.7

10.8

14.7

Gas type fluids

34.3

34.3

29.4

24.5

24.5 Note 1

19.6 Note 1

19.6 Note 1

19.6 Note 2

14.7Note 2

14.7Note 2

39.2

14.7

[N/mm2]

150.0

150.0

49.0

58.8

49.0

Note 3

39.2

39.2

117.6

9007

9007-ST

9096-SGM

19.6 Note 1
14.7Note 2

19.6

39.2

39.2

29.4

9007-GL

9007-ML

9007-LP

Note: 1 Minimum seating stress for a thickness of 1.0t or 1.5t.
Note: 2 Minimum seating stress for a thickness of 2.0t or 3.0t.
Note: 3 The allowable seating stress for a thickness of 2.0t or 3.0t is 78.4N/mm2.

Standard dimensions
TOMBO No.
Maximum O.D
［mm］

1133

1155

9007-SC

1.0 t

φ610

─

─

1.5 t

φ1250

φ1250

φ1200

3.0 t

φ1430

φ1250

φ1200

φ1430

1.0 t

●

─

─

●

●

●

1.5 t

●

●

●

●

●

2.0 t

●

●

●

●

3.0 t

●

●

●

●

2.0 t

Standard thickness

9007-LC

9007-G20

─
φ1200

─

─

φ1380

─

φ930
─

φ277

φ1380

φ600

φ930

─

─

●

─

─

─

●

●

●

─

●

─

●

●

●

●

─

─

●

●

●

●

●

●

●

─

9007-ML

9007-LP

φ1200

φ1200

φ1200

* The yellow part in the figure can be manufactured with a larger diameter than indicated by welding.
* The green part in the figure can be manufactured with a larger diameter than the indicated by adhesive.

Physical properties
TOMBO No.

1133

1155

9007-SC

9007

9007-ST

［mm］

1.5

1.5

1.5

1.5

1.5

1.5

1.5

1.5

3.0

1.5

2.0

Specific gravity

［─］

2.74

2.24

2.06

2.30

2.21

2.18

2.17

1.83

1.94

2.18

2.18

tensile strength［N/mm2］

18

11

24

18

21

34

35

141

22

22

28

5

6

4

5

8

9

14

18

18

13

9

47

46

67

55

53

60

69

39

69

62

78

100℃ × 22h

27

23

56

50

67

73

57

43

62

59

65

200℃ × 22h

59

41

79

74

─

─

─

67

87

─

─

Thickness

Compressibility［%］
Recovery ［%］Stress relaxation ratio ［%］34.3MPa

9007-LC 9007-G20

9096-SGM 9007-GL

The above values are actual measurements, not standard values.

Measured by: NICHIAS

Precautions for fluoropolymer products
Precautions concerning design and selection

Precautions for use

Gasket contact surface finish

Unusable fluid

The recommended surface roughness according to JIS
B 2220-2012 is as follows.
・For sealing liquid: 6.3μm Ra max
・For sealing gas: 3.2μm Ra max

Conformity to food applications
Please contact us for the suitability of each product forfood applications.

26

GAS K ET S

・Do not use the PTFE gasket for molten alkali metals, hot
fluorine, trifluorinated chlorine and other fluids that attack
the PTFE.

For monomer fluids
・When used for various monomer fluids, the fluid may
penetrate inside the gasket and polymerize. TOMBO
No.9007-ML is recommended for the monomer fluid.

For gas-type fluids
・When using it for gas sealing, use TOMBO No.9400 (NAFLON
paste) together to improve the sealing performance.

Sheet gaskets

9096-EZLTOMBO No.9096-TRI
TOMBOTM No.

EZL™ gasket

TM

TOMBO No.9096-TRI

Semi-metallic gaskets

Features

Sheet gaskets

TOMBO No.9096-EZL-S

TriGuard™ gasket

TOMBO No.9096-TRI-SP

A gasket using expanded PTFE with high compressibility is ideal for lining pipes and equipment that cannot apply highseating stress and flanges with large warping.
The EZL gasket does not require gasket adjustment because the cushion material absorbs the distortion of the flange
and the metal ring is used for the core thus installation work is easy even with a large diameter.

Service range

TOMBO No.9096-TRI
(water.oil, gas types,
corrosive fluids)

Since TOMBO No.9096-EZL has a high compressibility,
it is recommended to perform retightening after initialtightening work or after applying a temperature cycle.
* Please contact us if you would like to use the product outof the recommended service range shown on the left.

4.0
3.0
214℃

2.0

Metallic gaskets

TOMBO No.9096-EZL
(water.oil, gas types,
corrosive fluids)

Fluid pressure［MPa］

Use a tri-guard gasket for JIS 10K and JPI class 150 standard flanges. EZL gaskets are suitable for other sizes.

Use TOMBO No.9096-EZL, -TRI only
for general industrial use.

1.0

230℃

−100

−29

0

100

It cannot be used in the manufacturing, processing andpackaging processes of foods, pharmaceuticals,
cosmetics and pharmaceutical equipment.

260℃

200

300

Temperature［℃］

Structure［TOMBO No. 9096-TRI］

A metal ring is sandwiched between expanded PTFE cushioning materials with high compressibility. These are covered with PTFE and the outer peripheral part is sewn and integrated
with expanded PTFE thread. There are S type and F type depending on the shape on the innerdiameter side of the covering material. It is also available with metal hooks.

A three-layer structure in which the surface
layer of expanded porous PTFE is covered withan extremely thin special PTFE barrier membrane.

Rubber gaskets［TOMBO No. 9096-EZL］

PTFEPTFE skinskin
Expanded
Expanded PTFEPTFE yarn
yarn

PTFE barrier membrane

Expanded
Expanded PTFE
PTFE
cushioning
cushioning materialmaterial

Expanded porous PTFE

Metal
Metal ring
ring

TOMBO No. 9096-EZL-S (S type)

TOMBO No. 9096-EZL-F (F type)

TOMBO No.9096-TRI
Cloth gaskets

Design criteria
PTFE
PTFE barrier
barrier membrane
membrane

TOMBO No.9096-EZL

TOMBO No.9096-TRI

Gasket factor [m]S typeF type3.5
4.0

Min. design seating stress [y]14.7N/mm2
19.6N/mm2

Gasket thickness [mm]Gasket factor [m]Min. design seating stress [y]

1.5
3.0

2.4

10N/mm2
Pastes and other sealing materials

Shape

Expanded
Expanded porous
porous PTFE
PTFE

Standard dimensions
TOMBO No.9096-EZL

TOMBO No.9096-TRI
Note 1: It depends on the thickness.

Shape

Thickness [mm]Nominal diameter

Maximum outer diameter [mm]4.5, 8, 12300A ~ 600A
650A ~ 1500A

1000
3000

S typeF typeStandard

Nominal diameter

JIS10KJPI class150
Dimensions for lining piping JIS 10K

10～350ANote1
1/2B ~ 12B
15 ~ 300A

Thickness [mm]1.5, 3.0, 6.0
3.0, 6.0
GA S K E T S

27

Fluoropolymer gaskets
NAFLON™ PTFE envelope gasket
A PTFE envelope gasket with a PTFE outer skin covered on a core material such as a jointing sheet.
When ordering

Outer skinFelt

Please specify the productnumber (TOMBO No.).
Please note that the productthickness varies dependingon the core material and core
structure.

Corematerial
TOMBO No.1995

TOMBO No.9010-A-6

TOMBO No. indication
TOMBO No.

When ordering, please specify the product specifications (TOMBO No.) as below.

9010

A

5

S

D

Skin shapeCore materialType of application sizeCore type

Skin Shape

Indication symbol
A standard type

B large diametertype
AS right angled
type
KA Outside
sewing type
KB Outer sewing
type (large diameter)
KS Outer sewing type(right angled type)
RA Outside
welded typeCore material

Indication symbol
TOMBO No.
1880-GRA

B

TOMBO No.
1993

AS

TOMBO No.
1995-WKA

TOMBO No.
1995

KB

TOMBO No.
1995

KS

type (large diameter)
RS Outside welded
type (right angled type)
Others28

GAS K ET S

3

4

5

6

Felt
TOMBO No.
1120

7

RA
TOMBO No.
1120

RB Outside welded

2

RB

8

Felt
TOMBO No.
1120

RS

9

Stainless steel mesh

Z

Others* A version of this product using rubber for the core is alsoavailableZSheet gaskets

Selection example
Skin shapeCore structure

Applicable dimensions

Core structureStandard specifications

9010-A-5-S

Basic shape

TOMBO No.1995

Standard dimensions

SingleFor glass lining

9010-A-5-G-D

Basic shape

TOMBO No.1995

Glass lining
standard size

2 pieces

Used at 150°C or higher

9010-A-2-Z

Basic shape

TOMBO No.1880-GR

Specified dimensions

SingleOuter diameter is Φ
1000mm or more

9010-B-5-Z

Large diametercompatible type

TOMBO No.1995

Specified dimensions

SingleSemi-metallic gaskets

TOMBO No.

Sheet gaskets

Application

Information
The felted jointing sheet (core material code: 6, 8) has a larger amount of compression than the jointing sheet alone (core material code: 5, 7), thus it is easier toconform the unevenness of the sealing surface. Suitable to use on lining flanges with uneven sealing surfaces.

Indication symbol

Indication symbolCore type

S

Standard dimension

F

Glass lining standard dimension Note 2

G

Insulation gasket standard dimension

E

Customized dimension

Z

SingleNote: (1) NICHIAS standard. Refer to the dimensions table fordetails.

TOMBO No.1880(2) Applicable to the GL JPI flange from AGC Technology
Solutions, Co., Ltd

TOMBO No.1850-P

No
symbol

H

DoubleD

Corrugatedmetal insert

C

Flat metal
insertP

OthersZ

Cloth gaskets

With
handleRubber gaskets

NAFLON lining standard dimension Note 1

Metallic gaskets

Dimension type

* When core matenal 6 or 8 is used in the double, corrugatedor plate core structure, attach the felt only to the top andbottom surfaces.

Information

Example TOMBO No.9010-A-6-S
Outer skin: 0.4mm
Product thickness

Jointing sheet + felt: 2.4mm
Product thickness: 2.4 + (0.4×2) = 3.2mm

Pastes and other sealing materials

The product thickness of NAFLON PTFE envelopoed gasket is the combined thickness of the core and the outer skin.

* The standard outer skin thickness for the basic type (Atype) is 0.4mm, and the standard outer skin thickness
for the right-angled type (AS type) is 0.5mm.
* The thickness of the core changes depending on thesize. Please refer to the TOMBO brand gasket / Dimensions for the product thickness of standard dimensions.

GA S K E T S

29

Fluoropolymer gaskets
Service range
For standard: Jointing sheet, jointing sheet with felt

For high temperature use (core material symbol: 2)[MPa] Fluid pressure[MPa] Fluid pressure(Core material symbol: 3-8)

2.0
60°C

1.0

2.0

—100
—100

0

100

200

230°C

1.0

0

100

200

300

Temperature [˚C]300

Temperature [˚C]

For high temperature use (core material symbol: 9)*The total thickness of the core refers to the thickness not including
the outer skin.
*When the core structure is corrugated (symbol: C), the servicepressure should be up to 1.0MPa.
Note 1: When the core material is “6,8”, the usage range of the total
core thickness: ~ 3.0mm is applied even if the core thickness
is 4.2t.

[MPa] Fluid pressure

Total core thickness : ~3.0mmNote 1
Total core thickness : ~4.0mm
Total core thickness : ~6.0mm

2.0

1.0

—100

0

100

200

300

Temperature [˚C]

Design criteria
Shape symbol

A / AS / KA / KS / RA / RS TypeB / KB / RB Type

3、4、5、7(jointing sheet)

2(TOMBO No.1880-GR)

3、4、5、7(jointing sheet)

6、8(jointing sheetwith felt)

9(TOMBO No.1120+
SUS mesn)

6、8(jointing sheetwith felt)

[—]

3.50

3.50

4.00

4.00

2

[N/mm ]

14.7

19.6

19.6

19.6

Min. seating stress Water.oil type fluid

9.8

14.7

14.7

14.7

14.7

19.6

19.6

19.6

29.4

24.5

Core material
symbolGasket factor mMin. design
seating stress y3

Gas type fluid[N/mm2]

Allowable seatingstress2[N/mm ]

29.4

Note 124.5 (39.2)

Note 1: The values in parentheses are TOMBO No.1120 + stainless steel net type values.

Standard dimensions
Shape
Minimum I.D
Maximum O.D

A / KA / RA TypeB / KB / RB TypeAS / KS / RS Type

[mm]

φ15

φ300

φ20

[mm]

φ1000

Note 1

Note 1arbitrary

Note 1: Please contact us for the maximum outer diameter of the outer peripheral welding type.

30

GAS K ET S

φ700

Note 1

2(TOMBO No.1880-GR)

Sheet gaskets

Precautions for NAFLON™ PTFE Envelope gasket

Gasket contact surface finish

Sheet gaskets

Precautions concerning design and selection
Outer skin shape (inner periphery)

The recommended surface roughness according to JIS
B 2220-2012 is as follows.
• For sealing liquid : 6.3μm Ra max• For sealing gas : 3.2μm Ra max

NAFLON PTFE cushion gasket outer skin shape A type(basic type) may cause liquid accumulation due to its
structure. We recommend the outer skin shape AS type(right angled type) especially for places where there is aconcern about liquid accumulation.

Tightening torque control
Outer skin shape (outer periphery)Semi-metallic gaskets

The gasket factor m, minimum design tightening pressure yand minimum tightening surface pressure 3 of the NAFLONPTFE cushion gasket are designed assuming the above
gasket contact surface finish.
If the gasket contact surface is uneven or distorted, it may
require tightening beyond the design value.
Due to the structure of the NAFLON PTFE envelope gasket,
the allowable seating stress is low. In such cases, perform
sufficient tightening control.

NAFLON PTFE envelope gasket with types A, B and AS
may deteriorate in the following situations:• Operated under vacuum pressure• Forcibly installed with insufficient distance between
flange faces
If such situation is expected, we recommended using thetype sewn on the outer periphery (KA, KB, KS) or welded(RA, RB, RS).

Metallic gaskets

Precautions for use
Although PTFE envelope gaskets can be used in a wide range of applications but they can cause problems in the following cases.
We recommend using fluoropolymer gaskets such as the TOMBO No. 1133 and TOMBO No. 9007 series whenever possible.
Case

Assumed phenomenon

Countermeasures

During long term use, the fluid may permeate into
the gasket through the PTFE outer skin, deteriorate
the core material and causing the gasket to lose its
function.

Replace the gasket as soon as possible.
Use a fluoropolymer gasket.

Gasket with jointing sheet + felt
as core material is used

If the core material gets wet with liquid, thecompression breakage strength will decrease. If
soapy water or rainwater during the airtightness
test permeates and the felt softens and is pushedout, the gasket seating stress may drop andpossibly lead to leakage.

Store the gasket in waterproof condition.
Take note that there is no ingress of rainwater after
installing the gasket.
Ensure the tightening force is sufficient.

Air bubbles were found between
the PTFE outer skin and the corematerial when airtightness test
was performed

The air contained in the core material and the air
accumulated in the inner periphery are discharged.

Core material is rubber

Excessive deformation or air trapped in the innerperiphery may compress and damage the outer skin

Tighten below allowable seating stressInsufficient tightening

Since the range between the minimum recommended tightening value and the allowable tightening value is narrow, the gasket seating stress may
be insufficient and leakage may occur even whentightening to the target torque. (Especially the large
diameter type has a heat seal part, so the sealing
performance is lower than the basic type and theright angle processing type.)

Use TOMBO No. 9400 (NAFLON paste)

Liquid accumulation or leakage may occur due todifferent inner diameters.

Use NAFLON lining standard dimensions (applicable dimension symbol: F)
Use Glass lining standard dimensions (applicabledimension symbol: G)
Design appropriate gasket dimensions.

After applying internal pressure load, wait a certain
period of time before airtightness test is performed.
* It is especially likely to occur with the jointing sheet + felt type.

Pastes and other sealing materials

GA S K E T S

Cloth gaskets

Use standard size gaskets forlining piping.

Rubber gaskets

Used for highly permeable
fluids. Nitric acid, ethyleneoxide, Halogen (chlorine,
bromine, etc.), molten sulfur,
monochloroacetic acid.

31

Fluoropolymer gaskets
TOMBO No. 9096 series NICHIAS SOFTSEAL™
This is a PTFE soft type gasket. It is extremely soft and the version with adhesive tape can be easily installed on
sealing faces that are complicated shapes. It is suitable to be used as a piping sealant or as a gasket for tanks,
casings, ducts, pressure vessels, reaction tanks, lining vessels, large diameter equipment and other applications.

TOMBO No. indication When ordering, please specify the product specifications (TOMBO No.) as below.
T OMBO N o .

9096

R

10

Shape symbol

Size symbol

Shape

Shape symbol

Elliptical

No shape symbol

Flat

3.0

30

3.0

6.0

15

4.5

9.0

8

6.0

12.0

5

1.0

20.0

15

1.0

30.0

15

1.0

50.0

15

B

1.0

100.0

15

(Without adhesive tape)

2.0

20.0

5

2.0

30.0

5

2.0

50.0

5

3.0

20.0

5

3.0

30.0

5

3.0

50.0

5

3.0

100.0

5

3
6
9
12
1020
1030
1050
1100
2020
2030
2050
3020
3030
3050
3100

5.0

14.0

10

5014

7.0

20.0

5

7020

BT
(With adhesive tape)

Flat

SquareKT(With adhesive tape)

K(Without adhesive tape)
Square

Shape

Round

Shape symbolR

without adhesive tape

Shape

Round

Tube

32

GAS K ET S

Tube

without adhesive tapeSize symbol

1.5

Not available without adhesive tape

Elliptical

Size
Thickness [mm] width [mm] standard length/roll [m]Shape symbol

TB

Size
thickness [mm]standard length/roll [m]

10.0

5

12.0

5

Size
Outer diameter Inner diameter standard length/roll [m]
[mm]
[mm]

2.0

1.0

30

3.0

2.0

30

4.0

3.0

30

5.0

4.0

20

6.0

5.0

20

7.0

6.0

20

8.0

7.0

10

10.0

8.0

10

12.0

10.0

10

14.0

12.0

10

Size symbol

1012Size symbol

21
32
43
54
65
76
87
108
1210
1412

■ TOMBO No. の表示例
■形状：楕円型

Sheet gaskets■サイズ：幅 3mm、厚さ 1.5mm■形状：シート型（粘着テープ付き） ■サイズ：幅 1500mm×1500mm、厚さ 1.0mm■形状：チューブ型■サイズ：外径φ2.0mm、内径φ1.0mm

9096

Shape■サイズ：
symbol幅 20mm、厚さ
Size1.0mm
symbol■形状：平型（粘着テープなし）■形状：ガスケット打ち抜き品（粘着テープなし）

形 Shape
状

平
型
Sheet

■サイズ：ご指定ください

サSize
イズ

Shape
形 状 記symbol号

width [mm]
幅［mm］
厚 さ［mm］

20.0

BT（粘着テーST
プ付き）

30.0

B

(With adhesive tape)

形

状

形状記号

角

型

（粘着テープ付き）

Gasket

1.0

15
2.0

100.0

1.0

20.0

2.0

30.0

2.0

50.0

2.0

3.0
20.0
1500 × 15003.0
30.0

15
3.0
5
4.0
5
0.5
5
1.0
5
1.55

1500 × 30003.0
50.0

2.05

3.0

3.05
4.0

K

14.0

Shape symbol
20.0

形

GT

10.0
10

Remarks
5

7.0

7020

形 状G記 号GT

JIS、JPI 配管用ガスケットは、シート状ソフトシー(Without adhesive tape)

ガスケット打ち抜き品

5.0

Gaskets for JIS and JPI piping are cut from softseal sheets.
備please
考 consult us.
For other dimensions,(With adhesive tape)

状

5.0

1.0
1020
1.5
1030
1050
2.0
1100
3.0
2020
4.0
2030
0.5
2050
1.0
3020
1.5
3030
2.0
3050
3.0
3100
4.0
5.0
表示記号
6.5
10.0
5014

（粘着テープ付き）

Please use TOMBO No.9096-S, -ST, -G, -GT only for general industrial use.

G

（粘着テープなし）

Metallic gaskets（粘着テープなし）

Cut gasket

サ イズ1500 × 1500
6.5 巻き［m］
幅［mm］
厚 さ［mm］ 標準長さ／1

KT

Shape

1.0
15

50.0
1500 × 15001.0

100.0(Without adhesive tape)

1.0

Size
表 示symbol
記号

Semi-metallic gaskets

S

Thickness [mm]標準長さ／1
巻き
［m］

1.5
15

（粘着テープなし）

Sheet

ふ っ 素Sheet
樹 脂gaskets
ガスケット

9096-039096-ST-1.0
9096-TB-21
T OMBO N o .
9096-B-1020
9096-G

ルから打ち抜きます。
それ以外の寸法については別途ご相談ください。

It cannot be used in the manufacturing, processing and packaging processes of foods,
pharmaceuticals, cosmetics and pharmaceutical equipment.

形

温度

状

Shape

Temperature
Pressure
圧力 [MPa]
[MPa]

楕円型

■ 設計基準Design criteria

シート型

Elliptical

形

sheet

−100~260

[℃]
[°C]

5
5

液体
LiquidElliptical

2
2

シート型
sheet

3 mm 6 mm 9 mm 12 mm[N/mm]
最小締付線圧Minimumseating stress[N/mm]
2
Minimumseating stress[N/mm[N/mm2]]
最小締付面圧

2
2

Gas
ガ
ス

楕円型

状

Shape

−100~260

Rubber gaskets■ 使用範囲Service range

3mm

6mm

9mm

12mm

75
75

100
100

125
125

150
150

—

—
─

15~20
15~20

Compression characteristics● Compression-recovery curve (sheet: thickness 2mm)

3

20

2
1.5
1

15

10

Pastes and other sealing materials

Seating stress (N/mm2)

12mm width
9mm width
6mm width
3mm width

2.5
Gasket thickness (mm)

Cloth gaskets● Relationship between thickness and width with respect
to tightening force (Elliptical)

5

0.5

0

50

100

150

200

250

300

350

400

450

500

Tightening force (N/mm)* The above values are measured value. They are not standard values.
Measured by: NICHIAS

0

0

0.5

1.0

1.5

2.0

Amount of gasket strain (mm)* The above values are measured value. They are not standard values.
Measured by: NICHIASGA S K E T S

33

Expanded graphite gaskets
GRASEAL™ Gasket is a cut gasket made from expanded graphite sheet or an expanded graphite sheet containing a metal reinforcing plate.

TOMBO No.

1200

GRASEAL™ gasket

expandedgraphite sheet

FeaturesMore economical than other GRASEAL gaskets.
This gasket has lower strength and poor handling compared to a gasket containing a steel plate. For this reason, it isrecommended for small diameter with nominal diameter 4 inches or less.

Service temperature: Oxidizing atmosphere –240~400°C Non-oxidizing atmosphere –240~800°C Service pressure: ~3.0MPa

TOMBO No.

1215-AGRASEAL™ gasket PM-A
Other lineup
TOMBO No.1215-AT
1215-A with impermeable treatment.

expandedgraphite sheet

TOMBO No.1215-B
The steel plate is thicker than
1215-A, and a large diameter with anouter diameter of 2800mm can be
manufactured by welding.
316 stainless steel sheet(thickness 0.05mm)

Features

It is easy to handle and can be processed into complicated shapes.
Used for specially shaped flanges, valve bonnets, heat exchangers, etc.

Service temperature: Oxidizing atmosphere –240~400°C Non-oxidizing atmosphere –240~800°C Service pressure: ~5.2MPa

TOMBO No.

1210-AGRASEAL™ gasket MI-A

expandedgraphite sheet

Features

Tanged 316 stainless steel(thickness 0.1mm)

Higher strength than TOMBO No.1215-A.
* TOMBO No.1215-A is recommended when the strength is insufficient or there are restrictions on the specifications.

Service temperature: Oxidizing atmosphere –240~400°C Non-oxidizing atmosphere –240~800°C Service pressure: ~5.2MPa

34

GAS K ET S

Sheet gaskets

Sheet gaskets

1880-GRTOMBOTM No.

CMGC gasket

Expandedgraphite sheet

Semi-metallic gaskets

Features316 stainless steel

Gasket that is corrugated to concentrate the contact pressure, thus improving the sealing performance.
Can also processed into special shapes such as frame shape and full face.
Used for specially shaped flanges, valve bonnets, heat exchangers, etc.

Service temperature: Oxidizing atmosphere –240~400°C Non-oxidizing atmosphere –240~800°C Service pressure: ~5.2MPa
Metallic gaskets

1220/1221 GRASEAL™ Gasket Tape (Plane / Crinkle)

TOMBOTM No.

Example of use· TOMBO No.1220 Thickness 0.13mm
As a tape sealant for high temperaturescrew coupling. (maximum operating
temperature is 300°C)
TOMBO No.
1220

· TOMBO No.1220 Thickness 0.25mm
For sealing large diameter flanges of 18
inches or more.

Rubber gaskets

TOMBO No.
1221

· TOMBO No.1221

Features

For flange seals of 16 inches or less.

Attached directly to the flange surface as a one-size-fits-all gasket.
Attached to a hard gasket (TOMBO No.1850, 1841) as an auxiliary sealing material.
* Do not apply this tape to a soft gasket such as jointing sheet.

Service temperature: Oxidizing atmosphere –240~400°C Non-oxidizing atmosphere –240~800°C Service pressure: ~3.0MPa

Cloth gaskets

Information
Oxidizing atmosphere: A state in which gas contains large amount of oxygen, ozone, nitrogen dioxide or other oxidized gas. “Ambient atmosphere”
refers to oxidizing atmosphere.
Non-oxidizing atmosphere: A state filled with noble gas, nitrogen, carbon dioxide, etc.
Impermeable treatment: Expanded graphite is a graphite that has been expanded between the crystalline layers. It has a porous structure so
GRASEAL gasket is unable to completely prevent minute amounts of gas leakage. If high gas sealing performance is required, use a gasket with impermeable treatment to which sufficient seating stress can be applied.
The impermeable treatment lowers the heat resistance (maximum operating temperature: 260°C) but improves the gas sealability.

Pastes and other sealing materials

GA S K E T S

35

Expandedgraphite gaskets
製 品 情 報 膨 張 黒 鉛ガ スケット

Sheet gaskets■ Design criteria
1200

1215-A

1210-A

1880-GR

[—]

2.00

2.00

2.00

2.00

[N/mm2]

26.0

29.4

29.4

26.0

Water.oil type fluids

14.7

14.7

14.7

14.7

Note 1

39.2

TOMBO No.
Gasket factor m
Minimum design seating stress y
Minimum seating stress σ3[N/mm2]膨張黒鉛ガスケット

Allowable seating stress

49.0

49.0

49.0

0.8 t

170.0

294.0

294.0

1.6 t

106.0

167.0

167.0 Note 2

166.0

3.2 t

79.0

98.0

98.0

166.0

Gas type fluids[N/mm2]—

Note 1: Please note that it may be difficult to apply the specified seating stress with standard size products.
Note 2: TOMBO No.1210-A indicates the allowable seating stress of 1.5t.

■ Standard dimensions
TOMBO No.

1200

1215-A
1215-AT

1210-A

1880-GR

Nominal thickness [mm]0.4, 0.8, 1.6, 3.2

0.8, 1.6, 3.0

1.5, 2.0, 3.0

1.6, 3.2

Reinforcement [mm]plate thickness
Manufacturable [mm]gasket diameter

—

0.05

0.10

0.8

φ985

φ1480 Note 1

φ1480

φ3300 Note 2

Minimum width [mm]

—

5

—

12.8

Note 1: Manufacturable dimensions with a nominal thickness of 0.8mm are φ985 or less.
Note 2: Please contact us for dimensions exceeding φ3300.

［GRASEAL tape］
TOMBO No.

1220

1221

Thickness

[mm]

0.13

0.25

0.25

0.38

0.38

Width

[mm]

12.7

12.7

25.4

12.7

25.4

Length

[m]

7.6

7.6

15.2

7.2

14.2

Precautions for expanded graphite gasket■ Precautions regarding design and selection■ Precautions for use● Gasket contact surface finish● Since the expanded graphite gasket is easily deformed
and scratched, please be careful about the following
points when handling it. If the surface of the gasket isdeformed or has large scratches, it may not be
possible to maintain its original performance.

The recommended surface roughness according to JIS
B 2220-2012 is as follows.
・For sealing liquid : 6.3μm Ra max
・For sealing gas : 3.2μm Ra max● For gas-type fluids

Since expanded graphite is a sheet with expanded
layers, it has a structure with many voids inside.
Since gas-type fluids are prone to permeation leakage,please note the following points when using.
・Apply sufficient seating stress.
・Apply the paste and leave it for 2 to 3 hours until the gasket
conforms with flange surface.
・Do not use for toxic gas or high vacuum seals that cannot
tolerate even a small amount of leakage.
・ If you want to improve the airtightness, please use theimpermeable treatment product. (Maximum operating
temperature 260°C)

Fluids for which a GRASEALTMClassification

gasket is not suitable.

Nitric acid, concentrated sulfuric acid, hot sulfuric acid, chromic acid, mixed acid,etc.

Oxidizing salt

Nitrate, chloride, hypochlorite, etc

Halogen compound Bromine, fluorine, iodine, chlorine, dioxide, etc.

36

GAS K ET S

● When handling TOMBO No.1880-GR, 1215-A, 1210-A,
please note that the internal reinforcement metal plate
may cut your fingertips.
● When using TOMBO No.1880-GR, 1215-A, 1210-A, makesure that the stainless steel plate of the core is resistantto the fluid.

Name of fluid

Oxidizing acidCombustible gas

・Do not place heavy objects on top of the gasket
・Do not strike the gasket with a hard object.
・Do not step on the gasket or bend with your feet.
・When using a cutter or etc. when opening frompacking, please be careful not to damage the product.
・Please take out the product after opening the package
completely.

Oxygen (pure oxygen)

Applicable standards (TOMBO No.1200,1210,1215 series)■ JPI-7S-79 “Expnded Graphite Sheet Gasket for Piping”■ JIS F 7102 “Standard for Using Gaskets and Packing
for Pipes in Marine Engines”

Semi-metallic gaskets
Product2

Semi-metallic gaskets are gaskets that combine metals such as stainless steel plates with
non-metals such as expanded graphite, and are used at higher temperatures and pressuresthan sheet gaskets.
Sheet gaskets
Semi-metallic gaskets
Metallic gaskets

Kammprofile gaskets
A gasket in which
V-shaped metal
hoops and cushioning
materials called fillers
are alternately layered
and wound in a spiralshape.

A gasket in which
expanded graphite
sheets and PTFE
sheets are bonded toboth sides of a metalring with a groove
shape.

P39-P49

P50-P53
Cloth gaskets

Metal jacketed gaskets

Rubber gaskets

VORTEX™ gaskets

Gaskets for heat exchangers
Semi-metallic gaskets
can be manufactured
in a shape suitable forheat exchangers.
Please refer here forthe shape number.

P54-P55

P56-P57

GA S K E T S

Pastes and other sealing materials

A gasket in which an
inorganic heat-resistant cushion material
is covered with a thinmetal plate.

37

Semi-metallic gaskets

How to make an order
When ordering, please specify the product specifications (TOMBO No.) as below.
Type

Shape

How to specify gasket dimensions

Standard
product

Pressure class x nominal diameter x thickness

VORTEX
BasicW
 ith inner ring ith outer ringWW ith inner andouter rings

Custom size

VORTEX
With ribs

In addition to the gasket dimensions, specify the rib shape, type, material, corematerial, P dimension, rib R, etc. separately.

Kammprofile
BasicWith outer rings

Body inner diameter x body outer diameter x outer ring outer diameter x thickness

Kammprofile
With rib
With hanger

Body inner diameter x body outer diameter x outer ring outer diameter x thickness x
rib width x rib shape x P dimension

E.g. ) 300LB × 6B × 4.5

Pressure class x inner ring inner diameter x body inner diameter x
body outer diameter x outer ring outer diameter x thickness* Please specify the pressure class even for dimensions other than standard
products.
E.g.) 300LB × 738 × 750 × 780 × 804 × 4.5

E.g.) 66.9 × 88.9 × 111.3 × 4T
* For standard products, please specify the actual dimensions and also inform us of the pressureclass and nominal diameter.

E.g.) 1800 × 1840 × 1900 × 4T × 10W × HE5 × 123P × hanger* Please specify the dimensions of the hanger separately.

VORTEX™ gasket body outer diameter
For VORTEX with outer rings and inner and outer rings, the position indicating the outer diameter of the main body differs depending on the applicable standard of the flange.
Flange applicable standard

Approx.
1.6

Body outer diameterbody outer
diameter

For JPI pipe flange
For ASME pipe flange

Approx.
1.6

body outer
diameterOther than the above
standards
For JIS pipe flange
Other dimensions

body outer
diameterbody outer
diameter38

GAS K ET S

Convex part dimension
As shown in the figure on the left, it refers to the dimensions up to the convex part of the main body.
Please note that it is different from the contact outer
diameter with the flange

Shoulder part dimension
As shown in the figure on the left, it refers to the contact
outer diameter with the flange.

VORTEX™ gaskets
It can be used at higher temperatures and pressures than sheet gaskets and because it fits well with flanges,
it can be sealed with a lower tightening force than metal gaskets.
Sheet gaskets

How to make an orderSpecify the product number (TOMBO No.) andpressure class (working pressure).
Select an appropriate shape according to the typeof flange.

hoop

For heat exchangers, specify the shape as well.

fillerinner ring

1834R-GR series

TOMBOTM No.

How to indicate TOMBO No.

P41-P42

Flange shape and proper gasket shape

P45

Gasket shape for heat exchanger

P54

Semi-metallic gaskets

Outer ring

GRASEAL™ VORTEX™ gasket
Metallic gaskets

Service range

hoop

Expanded graphite filler

Maximum service water type fluid: class 2500 (Approx. 43MPa)pressure
oil/gas/corrosive fluid: class 1500 (Approx. 26MPa)

Low temperature fluid

50.0

450℃
450℃

10.0
5.0
1.0

0.1
−270

cryogenic fluid: 20MPa

oil/gas type fluid

−29 0

200

400

600

Rubber gaskets

water type fluid: 450˚C (650˚C)oil/gas/corrosive fluid: 450˚C (800˚C)
Minimum service temperature cryogenic fluid: −270˚C

Maximum service temperature

Fluid pressure［MPa］

water type fluid

800

Temperature [°C]

Features* The numbers in parentheses are non-oxidizing fluids, which are the maximum service temperatures when used for confined flanges.

Expanded graphite is used as the filler and it exhibits excellent sealing performance even under severe conditions suchas high temperature and high pressure, extremely low temperature, and thermal cycle other than oxidizing fluids.
It is most often used in various applications such as piping and equipment for power plants and petrochemical complexes.

1834R-NA series

NA VORTEX™ gasket
Cloth gaskets

TOMBOTM No.

Service range

hoop

Maximum service temperaturewater/oil/gas type fluids: 350˚C

Maximum service water type fluid: class 1500 (Approx. 26MPa)pressure
oil type fluid: class 600 (Approx. 10MPa)

gas type fluid: class 400 (Approx. 7MPa)

oil type fluidgas type fluid

50.0
350℃
350℃

10.0
5.0

350℃

Pastes and other sealing materials

NA filler

Fluid pressure［MPa］

water type fluid

1.0

0.1
−200

−29 0

200

400

600

800

Features

Temperature [°C]

NA paper (inorganic paper) is used for the filler, and it is economical because it can be used without an inner ring for
piping of 24B or less.
Used for plumbing and equipment for utilities such as steam, cooling water, and compressed air.
GA S K E T S

39VORTEX™ gaskets

1836R-GS/-GM/-GH series

TOMBOTM No.

mica
Hoop

VORTEX™ gasket-GS / -GM / -GH

GS
Expanded graphite filler containing antioxidant

GM

GH

Service range
water type fluid

oil/gas type fluids

water/oil type fluids

50.0
10.0
5.0
1.0
0.1
−200

−29 0

200

400

gas type fluid-GH series
Fluid pressure [MPa]Fluid pressure [MPa]-G S se ri e s, - GM s e r ie s

600

800

10.0
5.0
1.0
0.1
−200

−29 0

200

400

Temperature [°C]

600

800

Temperature [°C]

Maximum service temperature water type fluid: 650˚C

Maximum service temperature water/oil type fluids: 800˚C

Maximum service pressure water type fluid: class 2500 (Approx. 43MPa)
oil/gas type fluids: class 1500 (Approx. 26MPa)

Maximum service pressure water/oil type fluids: class 1500 (Approx. 26MPa)
gas type fluid: class 600 (Approx. 10MPa)

oil/gas type fluids: 650˚C* This product is designed to reduce
the loss of expanded graphite byoxidation, but if the internal fluid
contains oxygen, the loss of
expanded graphite may start when
the temperature exceeds 450°C.
* Do not use -GS series gasket at
450°C or higher if internal fluid
contains oxygen.
* Do not use -GM, -GH seriesgasket at 450°C or higher ifinternal fluid contains air.

50.0

gas type fluid: 800˚C

Since it uses special expanded graphite containing an antioxidant, it can be used under high temperature conditions of 450°C or higher.
Features* GR vortex is recommended below 450˚C.

You can select from three types, -GS, -GM, and -GH, depending on the usage conditions.
-GS series: Suitable for high temperature conditions of 450°C or higher, which does not contain oxygen in the internal fluid.
-GM series: Suitable for high temperature conditions of 450°C or higher and usage conditions with decoking.
-G H series: Suitable for high temperature conditions of 650°C or higher and usage conditions with decoking.

1838R-NM series

TOMBOTM No.

VORTEX™ gasket -NM
Service range

hoop

Featuresoriginal filler

 n ultra-high temperature spiral gasket that can be used up to 1000°C
A
using an original oxidation-resistant filler.
 ince the filler does not oxidize and disappear even at high temperatures, itS
is suitable for maintaining stable sealing properties for a long period of time.
Can also be used with highly oxidizing molten salts.

Fluid pressure [MPa]water type fluid

oil/gas type fluids

50.0
10.0
5.0
1.0
0.1
−200 −29 0

200

400

600

800

1000

Temperature [°C]
Maximum service temperature water type fluid: 1000˚C

oil/gas type fluids: 1000˚C

Maximum service pressure water type fluid: class 2500 (Approx. 43MPa)

oil/gas type fluids: class 1500 (Approx. 26MPa)

Information
Decoking is the process of burning and removing coke deposited on the inner walls of heating furnaces and equipment in ethylene plants. Since it is generally heated to a high temperature, the gasket is also required to have heat resistance.

40

GAS K ET S

Semi-metallic gaskets

1839R series

TOMBOTM No.

GRASEAL™ VORTEX™ gasket-L
Service range
Fluid pressure [MPa]Expanded graphite

Expanded graphite filler

Features

Minimum service temperature low temperature fluid: −270˚C

50.0

450℃

10.0
5.0
1.0

0.1
−270

Maximum service water/oil/gas/corrosive type fluids: class 600 (Approx. 10MPa)
pressure
low temperature fluid: class 600 (Approx. 10MPa)

low temperature fluid

−29 0

200

400

600

Semi-metallic gaskets

Maximum service temperature water/oil/gas/corrosive type fluids: 450˚C

Sheet gaskets

water/oil/gas/corrosive type fluids

800

Temperature [°C]

A gasket that consists of large amount of filler on the sealing surface and enables sealing with a lower tightening force
than a normal GRASEAL vortex gasket.
F or JPI standard flanges dimensions designed with a narrow seal width, please refer to TOMBO Brand Gasket (Dimensions).
Can be used in cryogenic lines such as LNG, LN2, liquefied hydrogen, and liquefied air.

1839RAL series

Metallic gaskets

GRASEAL™ VORTEX™ g asket-AL

TOMBOTM No.

Service range

Expanded graphite

Stainless steel
hoop

Fluid pressure [MPa]water/oil/gas type fluids

Aluminum hoop

Features

Minimum service temperature low temperature fluid: −270˚C

50.0
300℃

10.0
5.0
1.0

0.1
−270

Maximum service water/oil/gas type fluids: class 600 (Approx. 10MPa)
pressure
low temperature fluid: class 600 (Approx. 10MPa)

−29 0

200

400

600

Rubber gaskets

Maximum service temperature water/oil/gas type fluids: 300˚C

low temperature fluid

800

Temperature [°C]GRASEAL VORTEX gasket for aluminum flange with a structure that does not easily damage the flange surface.
Can also be used in cryogenic lines such as LNG, LN2, and liquefied air.

9090-IOR series

TOMBOTM No.

NAFLON™ VORTEX™ gasket
Cloth gaskets

Service range

Hoop

PTFE filler

Maximum service temperature water/oil/gas corrosive type fluid: 300˚C

Features

Minimum service temperature low temperature fluid: −200˚C

Maximum service water/oil/gas corrosive type fluid: class 600 (Approx. 10MPa)
pressure
low temperature fluid: class 600 (Approx. 10MPa)

low temperature fluid

50.0
300℃

10.0
5.0

Pastes and other sealing materials

Fluid pressure [MPa]water/oil/gas corrosive type fluid

1.0

0.1

−200 −29 0

200

400

600

800

Temperature [°C]Using PTFE as the filler, it exhibits excellent sealing performance even in harsh conditions where corrosive fluids, pure oxygengas, and airtightness are required.
Used in piping and equipment such as petrochemical process lines and heat medium lines.
GA S K E T S

41

VORTEX™ gaskets

セミ メタルガ スケット

Line upWith inner rod
It is a specification with a metal rod attached to the inner diameter sideand is used in places where the required inner ring width is narrow.
We recommend TOMBO No.1891 (Kammprofile gasket) because it is easy
to buckle when the diameter is large.

rodWith would metal hoop
It is a specification in which only the hoop is wound on the inner or outer

metal hoop
winding

diameter side, and it is used for male & female type and tongue & groove
type flanges where the width is narrow and a normal outer ring cannot be
manufactured.
metal
hoop
winding
thicknesswidthIt cannot be used for FF and RF flanges because the wound metal winding part does not have the strength of the inner ring and outer ring.
Only 4.5mm gasket thickness can be manufactured. (The thickness of thewound metal winding part is 3.2mm, and the maximum width of the metal
winding is 3.0mm.

width

Irregular shape
It is mainly used for boiler manholes, handholes, and other valve
bonnets.
 lease specify the dimensions of A, B, C, R1, R2 and R3 shown in thePfigure below.
It is difficult to manufacture a shape with a long straight part and a shapewith an extremely small radius of curvature, so please contact us separately.

Track type

Elliptical type

A

C

A
R1

R1
R2
B

R3

R2
B

C

Square type

A

A

R1
R1 = A
2

Diamond type

R1
R3

B

* If R3 is a straight line with a diamond shape, R3 is not required.
* A dimension of track type and oval shape must be 40mm or more, diamond type and square shape must be 60mm or more.
* Ratio A / B must be 2/3 or more.
* As a guide, the length of the straight part (marked within the below figure) should be 100mm or less, as it will easily break apart.

42

GAS K ET S

A

C
C

ボルテックス ガスケット

Only 4.5mm gasket thickness can be manufactured.
(The rod diameter is φ3.2, the rod material is 304 stainless steel or 316
stainless steel)®

Semi-metallic gaskets

TOMBO No. 1834R-GR series

GRASEAL VORTEX gasket

TOMBO No. 1834R-NA series

NA VORTEX gasket

TOMBO No. 1836R-GS/-GM/-GH series
TOMBO No. 1838R-NM series

Sheet gaskets

TOMBO No. indication method
hoop

VORTEX gasket-GS/-GM/-GH
Outer ring

fillerinner ring

VORTEX gasket-NM

1 8 3 4RGR

EES
Semi-metallic gaskets

With outer ring
No

0

Yes

3

Special specifications
Nil

Hoop material
304 stainless steel

4316 stainless steel

6others8

No symbol

Gas-tight treatment

G

Degreasing treatment

K

With inner ringNo

No Symbol

Yes

R

Metallic gaskets* GRASEAL Vortex is the only productthat is suitable for gas-tight treatment
and oil-free / degreasing treatment.

With outer ring
No
OthersO
See Table below

Specification
Standard

No Symbol
EX

With inner rod

RDWith inner wound metal

IH

With outer wound metal

OH

With inner & outer wound metal

IOH

With inner ring
No
OthersO
See Table below* With inner rod, hoop with wound metal winding indicate the material of therod and wound metal winding hoop.

Rubber gaskets

For heat exchangers (with rib(s))

Hoop material

Gasket type
GRASEAL VORTEX gasket

GR

NA VORTEX gasket

NA

VORTEX gasket-GS

GS

VORTEX gasket-GM

GM
GH

VORTEX gasket-NM

NM

Material indication symbols for hoops, inner rings, and outer rings
S

310 stainless steel

V

TitaniumT

304 stainless steelE

410 stainless steel

R

Alloy 600

Y

316 stainless steelG

430 stainless steel

U

Alloy 400

M

304L stainless steel

L309S + cb stainless steel

W

Nickel

N

316L stainless steel

H316ELC stainless steel

X

OthersZ

321 stainless steelJ

347 stainless steelK* The above includes materials that can be used only for hoops and inner and outer rings. Please contact
us for availability. Materials not listed may be available as individual specifications, so please contact us. In
that case, use “Other: Z” and indicate the material name.

 ecommended service
R
temperature for hoop metenal
304 stainless steel,
304L stainless steel

500˚C max

316 stainless steel,
316L stainless steel

600˚C max

347 stainless steel

750˚C max

321 stainless steel

750˚C max

Titanium

500˚C max

Alloy 400

750˚C max

Alloy 600

1000˚C max

GA S K E T S

Pastes and other sealing materials

Carbon steel

Cloth gaskets

VORTEX gasket-GH

See Table below

43

VORTEX™ gaskets

TOMBO No. 1839R series

GRASEAL VORTEX gasket-L

TOMBO No. 1839RAL series

GRASEAL VORTEX gasket-AL

1 8 3 9R

EEEWith outer ringSpecial specifications

No

0

No

Yes

3

Gas-tight treatment

G

Degreasing treatment

K

No Symbol

With inner ringNo

No Symbol

Yes

R

With outer ring/ materialNoO
See Page 41

OthersApplication (flange material)
Stainless steel

With inner ring/material

No Symbol

AluminumNo

ALO
See Page 41

OthersHoop material
See Page 41

TOMBO No. 9090-IOR series

NAFLON VORTEX gasket

9 0 9 0IOR

TTG

With inner and outer ringSpecial specification

Basic

No

No Symbol

With inner ringIR

With outer ringOR

With inner and outer rings

IOR

No symbol

For Oxygen use (OX treatment)

OX

With outer ring/ materialNo* With inner rod + With outer ring 9090- RD - OR
Inner hoop winding + outer ring 9090- I H - ORO
See Page 41

OthersSpecifications

With inner ring/material

standard

No symbol

For heat exchangers (with rib(s))

No

EX

O

OthersSee Page 41

Hoop material
See Page 41

Examples of TOMBO No. indication
Shape

Specification

Type of productHoop material

1806-GR-GOO

Basic

—

GRASEAL VORTEX

316 stainless steel

none

none

1834-NA-EOS

With outer ring—

NA VORTEX

304 stainless steelnonecarbon steel

9090-IOR-TTG

With inner and outer rings—

NAFLON VORTEX

Titanium

Titanium

316 stainless steel

1838-IH-GR-ZZZ

With outer ringWith inner hoop wound metal winding

GRASEAL VORTEXOthersNote 1

OthersNote 1

OthersNote 1

Note 1: please specify material name for other materials.

44

GAS K ET S

inner ring material outer ring materialセミ メタルガ スケット

Semi-metallic gaskets

1804-GRTOMBO No. Note 1
Gasket factor m

9090

1806-GS-GM,-GH

1808-NM

[—]

3.00

3.00

[N/mm2]

68.9

58.8

water. oil type fluids

29.4

34.3

29.4

34.3

34.3

─

gas type fluid

39.2

78.4

39.2

78.4

78.4

class 300 39.2

Min seating stress[N/mm2]

1809
1809ALボ ル テ ッSemi-metallic
ク ス ガgaskets
スケット

Min. design seating stress y

1804-NA

Sheet gaskets

Design criteria

class 150 29.4
class 600 49.0

Allowable seating stress

294.2[N/mm2]294.2®

Note 1: Indicates the basic type of TOMBO No.

Recommended width of gasket body (When gasket thickness is 4.5mm)
When setting the vortex dimensions individually, make sure that the gasket body width is at least the recommended minimum width
shown in the figure below.
30

Metallic gaskets

25

Recommended minimum widthfor NA VORTEX and VORTEX-GM,-GS, -GH, -NM
20

Recommended minimum width for
GRASEAL VORTEX and NAFLONVORTEX

15

Rubber gaskets

Maximum width of the main body [mm]Recommended width

10

5

0
100

200

300

400

500

600

700

800

900

1000

1100

1200

1300

Cloth gaskets

16

1400

Main body inner diameter [mm]Standard dimensions
Gasket thickness [mm]Note 1

inner and outer ring thickness [mm]Recommended manufacturable body
inner diameter Note 2 [mm]Other than carbon steel

Min.

Max.

2.0

2.0

φ16

φ600

4.5 (standard)

3.2

3.0

φ16

φ3000

6.4

4.5

4.0

φ1500

φ3000

Pastes and other sealing materials

Carbon steel

3.2

Note 1: Vortex Gasket-NM thickness lineup is only 4.5mm.
Note 2: We can also manufacture gaskets dimensions other than the above. However, this may result in deformation, warping, or breaking up of thegaskets. In addition, the delivery period may be longer than usual due to special specifications. Please consult us for details.

GA S K E T S

45

VORTEX™ gaskets

Available main body width and minimum inner and outer ring width
Main body I.D.
Inner ring I.D.
Outer ring I.D.
[mm]

Available body width [mm]Main body thickness 3.2mm(basic, with outer ring) (with inner and outer ring)

Main body thickness 4.5mm Main body thickness 6.4mm

Minimum width of Minimum width of
inner ringouter ring(all snapes)(all snapes)

[mm]

[mm]
－

14 max

4.0 ~ 84.0 ~ 84.5 ~ 8－－30 max

4.0 ~ 10

4.0 ~ 10

4.5 ~ 10

－

2.5

－

46 max

4.0 ~ 15

4.0 ~ 15

4.5 ~ 15

－

2.5

4.0

55 max

4.0 ~ 20

4.0 ~ 20

4.5 ~ 20

－

3.0

4.0

70 max

4.0 ~ 224.0 ~ 22

4.5 ~ 25

－

3.0

4.0

90 max

4.0 ~ 224.0 ~ 22

4.5 ~ 30

－

3.5

4.0

110 max

4.5 ~ 22

4.5 ~ 225.0 ~ 35

－

3.5

4.0

150 max

4.5 ~ 22

4.5 ~ 225.0 ~ 35

－

4.0

4.0

170 max

4.5 ~ 22

4.5 ~ 225.0 ~ 40

－

4.0

4.5

200 max

4.5 ~ 20

4.5 ~ 22Note 1

5.0 ~ 40

－

4.0

4.5

300 max

4.5 ~ 20

4.5 ~ 225.0 ~ 40

5.0 ~ 404.5

4.5

400 max

4.5 ~ 18

4.5 ~ 225.0 ~ 40

5.0 ~ 405.0

5.0

500 max

5.0 ~ 18

5.0 ~ 27

5.5 ~ 40

5.5 ~ 405.5

5.5

600 max

5.5 ~ 15

5.5 ~ 27

6.0 ~ 35

6.0 ~ 35

6.0

6.0

700 max

6.5 ~ 15

6.5 ~ 29

6.5 ~ 35

6.5 ~ 35

7.0

7.0

800 max

6.5 ~ 15

6.5 ~ 107.0 ~ 35

7.0 ~ 358.0

8.0

900 max

6.5 ~ 15

6.5 ~ 10

7.5 ~ 35

7.5 ~ 359.0

9.01000 max

6.5 ~ 15

6.5 ~ 108.0 ~ 30

8.0 ~ 30

10.0

10.0

1100 max

8.5 ~ 15Note 2－

8.5 ~ 30

8.5 ~ 30

11.0

11.0

1200 max

Note 2

9.0 ~ 15－

9.0 ~ 30

9.0 ~ 30

11.0

12.0

1300 max

10.0 ~ 15Note 2－

10.0 ~ 27

10.0 ~ 27

11.0

13.0

1400 max

11.0 ~ 15Note 2－

11.0 ~ 27

11.0 ~ 27

11.0

14.0

1500 max

Note 212.0 ~ 15－

12.0 ~ 27

12.0 ~ 27

11.0

15.0

1600 max－－(12.0) ~ 27

(12.0) ~ 30

15.0

16.0

1700 max－－(12.0) ~ 25

(12.0) ~ 30

15.0

17.0

1800 max－－(12.0) ~ 25

(12.0) ~ 30

15.0

18.0

1900 max－－(12.0) ~ 25

(12.0) ~ 30

15.0

19.0

2000 max－－(12.0) ~ 25

(12.0) ~ 30

20.0

20.0

2100 max－－(12.0) ~ 22

(12.0) ~ 30

20.0

20.0

2200 max－－(12.0) ~ 20

(12.0) ~ 30

20.0

20.0

2300 max－－(12.0) ~ 20

(12.0) ~ 25

20.0

20.0

2400 max－－(12.0) ~ 18

(12.0) ~ 25

20.0

20.0

2500 max－－(12.0) ~ 18

(12.0) ~ 25

20.0

20.0

2600 max－－(12.0) ~ 15

(12.0) ~ 22

20.0

20.0

2700 max－－(12.0) ~ 15

(12.0) ~ 22

20.0

20.0

2800 max－－(12.0) ~ 15

(12.0) ~ 22

20.0

20.0

2900 max－－(12.0) ~ 15

(12.0) ~ 20

20.0

20.0

3000 max－－(12.0) ~ 15

(12.0) ~ 20

20.0

20.0

3000 or more－－

(12.0) ~ 15

(12.0) ~ 20

20.0

20.0

* Indicates the range that can be manufactured. Design the appropriate dimensions according to the usage conditions.
* If the above dimensional range is exceeded, deformation, warpage, and breaking may easily occur and delivery may take longer than usual as a special specification, so please contact us for details.
* The above dimensions may not be available depending on the type of filler and the material of the hoop.
* As a general rule, the thickness of TOMBO No. 1808-NM, 1809, 1809AL and special shape vortex is only 4.5mm.
* The maximum available size of TOMBO No.1809 is up to φ1200 and TOMBO No.1809AL is up to φ600. Please contact us for larger dimensions.
Note 1: The maximum width is 20mm when the filler type is “NA filler”.
Note 2: Please contact us if you have an outer ring.

46

GAS K ET S

ボルテックス ガスケット®

Semi-metallic gaskets

Sheet gaskets

Design guidelines for gasket standard clearance and appropriate groove depth(Tongue and groove(T&G)or male andfemale(M&F)type flange)
Gasket clearanceStandard clearance [mm]Gasket main body [mm](b)

250 or lower

0.5

0.5

251 ~ 630

0.7

0.7

f

(a)

•

631 ~ 1600

1.0

1.0

1601 min

1.5

1.5

aa

bb

Semi-metallic gaskets

Groove depth

Gasket thickness [mm]Appropriate groove depth (f) [mm]3.2

3.5 min

4.5

5.0 min

6.4

7.0 min

When used in tongue and groove flange

Metallic gaskets(Face and groove(F&G)type flange)•

Gasket clearance•

Groove depth

The clearance (b) differs according to the gasket
seating stress.
Please consult us for details.
f

ボルテックス ガスケット®

•aAppropriate groove depth (f) [mm]3.2

2.4 (+0.1,−0)

4.5

3.2 (+0.1,−0)

6.4

−

b

Rubber gaskets

Gasket thickness [mm]When used in face and groove flange

Type of flange face and appropriate gasket shape
Raised face (RF)Male and female (M&F)

Tongue and groove (T&G)

With inner ring

Basic type

Cloth gaskets

Flat face (FF)Type offlange face

With inner and outer ring

Pastes and other sealing materials

Appropriate
With inner and outer ringshape

* If all of the following conditions are met, it can be used without an inner ring.
• Size: Nominal diameter Ø24B or less or 600A or less • Pressure rating: Class 600 or less or 40K or less • NA vortex gasket

GA S K E T S

47

セミ メタルガ スケット

VORTEX™ gaskets

Precautions for VORTEX gasket
Precautions for VORTEX gasket

Precautions regarding design and selection•

Gasket contact surface finish•

Shape of VORTEX

The recommended surface roughness according to JIS
B2220-2012 is as follows.

Not suitable for flanges with V-groove on the gasket seatsurface.

•

Bolt material

VORTEX gaskets require greater tightening force thansheet gaskets. Therefore, it is recommended to use
high-strength bolts such as SNB7 or higher as the bolt
material.

•

Plating of inner and outer rings

When the material of the inner ring and outer ring iscarbon steel, the surface is plated to prevent rust duringstorage. Therefore, please note the following points.
• The heat resistant temperature of plating is 200°C.
• If you need to be careful about the small amount of elution of plating
components, please use stainless steel.

• When the filler material is other than NA• When the filler material is NA, the pressure rating is class 900 or
more, or the nominal diameter of the flange is 650A (26B) or more.

•

For large diameter gaskets

When using a large-diameter gasket under high pressure
conditions, the gasket may be deformed by the end force
or the flange may be deformed. Please contact us inadvance.

•

Recommended gaskets for various fluids
FluidsPrecautions

Combustible gas

Do not use GRASEAL VORTEX or NA VORTEX gasket.
Oxidative loss of organic components in GRASEAL andNA filler may occur.

• NAFLON VORTEX for oxygen(TOMBO No. 9090-OX series)

Strong oxidizing fluid(Oxidizing acid, oxidizing salt, halogen
compound)

Do not use GRASEAL VORTEX gaskets. There is apossibility of GRASEAL being oxidized.

• NAFLON VORTEXHigh temperature fluid

Select materials for the hoop and inner ring that canwithstand the conditions of use.

• Vortex Gasket-GS, -GM, -GH• Vortex Gasket-NM

Corrosive fluid

Do not use NA VORTEX gasket because the fluid
corrodes the filler• Do not use NA Vortex as it will damage thefiller.

•When used for the full face flange (FF)

If the flange is thin and low strength, tightening may distort
the flange. If this happens, the flange surface and theouter ring may come into contact with each other, and theseating stress required for sealing may not be obtained.
Therefore, the FF flange must have sufficient strength(thickness).

•

Use with low pressure flanges(JIS 5K or lower flange, vacuum flange, etc.)

Vortex gaskets require greater tightening force than sheet
gaskets. Low pressure flanges are not recommended asthey often do not provide sufficient bolt or flange strength
to tighten the gasket.

48

Recommended gaskets

GAS K ET S•

Use with aluminum flanges

Use the TOMBO No.1809AL series for aluminum flanges.
Use of any other vortex gasket may damage the flange.

ボルテックス ガスケット• For sealing liquid : 6.3μm Ra max• For sealing gas : 3.2μm Ra max

By preventing the inner ringfrom deforming to the innerdiameter side of the gasket
body during tightening, it has
the functions of preventing
Buckling
buckling of the gasket body,maintaining a high tightening
force and preventing
damage (breaking) of thegasket. Be sure to attach theinner ring when installing ona flange that is not restricted on the inner diameter side, orin the following cases.

®

Semi-metallic gaskets

 hen used for slip-on weldingWflanges
When using for slip-on welding flanges, thebutt welded flanges, so please check the types

Shape

Slip-on welding
type Plate flange
(SOP)

—

FigureSheet gaskets

gasket dimensions are different from those ofFlange typeof A, B, and C before ordering.

A
Slip-on welding
type Hub flange(SOH)

B
Semi-metallic gaskets

C· Place the gasket in an appropriate position so that it does
not shift to one side of the flange.

—

Lap joint flange(LJ flange)—

Thread flange (TR)—Integrated flange(IT)—

Blind flange (BL)—

Applicable standard▀ JIS F 0602

“Shipbuilding-Non-asbestos gaskets to cargo piping system”(HUC TOMBO No.1834-NA, HUD TOMBO No.1834R-NA,
KUD TOMBO No.1834R-GR, FUC TOMBO No.9090-IOR)▀ JIS F 7102

“Standard for using gaskets and packing for pipes in marine engines”(HUC TOMBO No.1834-NA, HUD TOMBO No.1834R-NA,
KUD TOMBO No.1834R-GR)· As a general rule, it is not necessary to apply gasket paste
but if there is a particular request, it is recommended to use
TOMBO No. 9400 (NAFLON paste) together under theconditions of 260°C or lower.

▀ JPI-7S-41· The gasket cannot be reused.

“METALLIC GASKETS FOR PIPE FLANGES”

When using the basic vortex

The basic vortex (including irregular shapes) may
be deformed by a slight external force, so handle
with care. In addition, even if some deformation
occurs, it may be possible to use it by inserting it
into the flange groove as it is, so please contactus.

“Spiral wound gaskets for piping”(TOMBO No.1804-GR series, TOMBO No.9090 series)▀ ASME B16.20▀ API 601（旧 )Pastes and other sealing materials•

Cloth gaskets· Handle the gasket with care. In particular, large-diameter
gaskets are easily damaged (disassembled), so arrange
appropriate persons to handle them carefully.

Butt welding type
Flange (WN)

Rubber gaskets

Before installation· Before installing the gasket, clean the flange surface andcheck that there are no foreign objects or scratches.

—

Metallic gaskets•

Precautions for use

Socket welding
type Flange (SW)

METALLIC GASKETS FOR RAISED FACE PIPE
FLANGES AND FLANGED CONNECTIONS(DOUBLE JACKETED CORRUGATED AND SPIRAL-WOUND)▀ BS 3381

METALLIC SPIRAL-WOUND GASKETS FOR
USE WITH FLANGES TO BS 1560, PARTS 1 AND 2▀ ISO 7483

DIMENSIONS OF GASKETS FOR USE WITH FLANGES TO ISO 7005

GA S K E T S

49

Kammprofile gaskets
It has the same sealing performance as a vortex gasket and can be used only with the main body.
Since it can be designed even with a narrow gasket width, it is suitable for equipment such as heat exchangers and pressure vessels.
When ordering
Surface layer

Please specify the product number (TOMBO No.).
Select an appropriate shape according to the typeof flange.
 or heat exchangers, please specify the shape ofFthe gasket.

Core

TOMBO No. indication
TOMBO No.

1891

Surface layer

Expanded graphite

Flange seat and proper gasket shape

P51

The gasket shape for the heat exchanger

P54

When ordering, please specify the product specifications (TOMBO No.) as below.

GR

E

E

Surface layerCore material

Outer ring materialindication
symbolCore materialindication
symbolGR

304 stainless steelE

304 stainless steel

316L stainless steelH

430 stainless steelU

321 stainless steel

J

none

O

Alloy

Y

matenal other than above

Z

Material other than the aboveZ

Outer ring materialindication
symbolE* For ribs and hangers, please specify thedimensions.

With hangers

PTFE

TF

With outer ring

NM sheetNM* If the flange shape is raised face (RF) or a flatface (FF), use a hanger or an outer ring for centering.
* This is a picture with a part of the surface material is removed.

50

GAS K ET S

Semi-metallic gaskets

1891-NMTOMBOTM No.

Sheet gaskets

High temperature kammprofile gasket that can be used at 1000°C
Service range

Maximum service temperaturewater/oil/gas fluids: 1000˚C

water type fluid

oil/gas type fluids

water type fluid:
class 2500 (about 43MPa)
oil/gas fluids:class 900 (about 16MPa)

10.0

Semi-metallic gaskets

Fluid pressure [MPa]Maximum service pressure

1.0

0.1
—200

—29 0

200

400

600

800

1000

Temperature [°C]

 gasket that uses the NM sheet as the surface layer material for high temperature that isA
originally developed, and can be used in the high temperature up to 1000°C.
T here is almost no oxidation loss of the sheet even if it exceeds 400°C, and stable sealing
performance is maintained for a long period of time.

Metallic gaskets

Features

Can be used under high temperature and oxidation conditions

Excellent workability here is no worry that it will come apart even with a large diameter exceeding φ1000, and itTis excellent in handleability.

Test result

The gasket sandwiched between the simulated flanges is loaded with heat of 1000°C for apredetermined time, then cooled to room
temperature, and a seal test is performed.

1000˚Cgasket dimension

ASME class 300 2B

Seating stress78.4 n/mm2

Internal pressure

before heating: 2.1 MPa
after heating: 0.2 MPa

Test fluid

nitrogen gas

Evaluation method

pressure dropMarket distribution products

100

10

1
Cloth gaskets

Test temperature

NM Kammprofile
Leakage amount [ml/min]

Test method

Rubber gaskets

1000˚C heat resistance test

0.1

0.01
0

50

100

150

200

Heating time [h]Pastes and other sealing materials* Measured by: NICHIASGA S K E T S

51

Kammprofile gaskets

1891-GRTOMBOTM No.

Service range

Maximum service temperaturewater/oil/gas type fluids: 400°C

Fluid pressure [MPa]water/oil/gas type fluids: Class
2500 (about 43MPa)

Fluid pressure [MPa]water/oil/gas corrosive type fluids

Maximum service pressure

50.0

10.0
5.0

1.0

0.1
—200

—29 0

100

200

300

400

1891-TF

500

600

700

800

Temperature [°C]

TOMBOTM No.

Service range

Maximum service temperaturewater/oil/gas type fluids: 260°C

water/oil/gas/corrosive type fluids

50.0

Fluid pressure [MPa]Fluid pressure [MPa]Maximum service pressure

water/oil/gas type fluids: Class 600(about 10MPa)

10.0
5.0

1.0

0.1
—200

—29 0

100

200

300

400

500

600

700

50.0

10.0
5.0

1.0

0.1
—200

800

—29 0

100

200

300

400

Temperature [°C]

500

600

700

800

Temperature [°C]

Design criteria
TOMBO No.

1891-GR

Gasket factor m[─]Min. design seating stress yMin. seating stress σ3[N/mm2]1891-TF

1891-NM

Note 1

3.00

Note 12.25

2[N/mm ]

15.2

44.8Note 1

water/oil type fluids

29.4

34.3

gas type fluid

39.2

78.4

2

450

450

Allowable seating stress[N/mm ]

Note 1: The applicable range is the standard flange and the design flange of the existing equipment. For new flange design, design criteria for spiral woundgaskets is as follows. (m = 3.00, y = 68.9 [N/mm2]).

Standard dimension
Gasket thickness [mm]Manufacturable range

Core width

2.3

4.0

5.0

Inner diameter10 ~ 690.0

20.1 ~ 3980.0

Outer diameter

20 ~ 700.0

30.1 ~ 4000.0

Standard width－

10, 13, 15, 20

Manufacturable width

10～20

outer diameter φ 30.1 ~ φ 50.0 : 5～15
outer diameter φ 50.1 ~ φ 100.0 : 8～20
outer diameter φ100.1 ~ φ4000.0 : 10～30

Standard Core material

304 stainless steel, 316L stainless steelStandard hanger material

304 stainless steel

Construction

Basic type, with hanger type, with ribs type and with outer ring type

Note 1

Note 1: Kammprofile gaskets cannot be manufactured with “bolt holes for flat face” or “irregular shapes (track type, oval shape, etc.)”.

52

GAS K ET S

50

10

5

1

0

Semi-metallic gaskets

1891 カンプロファイルガスケット

TOMBO No.
TM

■ Design guidelines for standard gasket clearance and appropriate groove depth● Groove and gasket clearance● Groove depth (For a gasket thickness of 4mm)
Flange type

Appropriate groove depth (f) [mm]

(a)

(b)

Tongue and groove type (T&G)

5.0 or higher

250 or lower

0.5

0.5 or higher

Male and female type (M&F)

5.0 or higher

251 ~ 630

0.7

0.7 or higher

631 ~ 2000

1.0

1.0 or higher

2001 ~ 3000

1.3

1.3 or higher

3001 or higher

1.5

1.5 or higher

Sheet gaskets

Standard clearance [mm]Gasket body [mm]ffSemi-metallic gasketsab

When used in tongue and groove (T&G) flangeb

Metallic gaskets

カンプロファイルガスケットaWhen used in male and female (M&F) flange■ Type of flange face and appropriate gasket shape
Flat face (FF)Raised face (RF)Tongue and groove (T&G)

Basic

Basic

Rubber gaskets

Male and female (M&F)

Type offlange face

Appropriate
shapeWith hangerNote 1

With hangerNote 1

Note 1: For piping standard gaskets (class 150 / class 300), an outer ring is attached.

● Gasket contact surface finish● Since the Kammprofile gasket has expanded graphite,
PTFE and NM sheet attached to the surface layer, thesurface of the gasket is easily scratched, and if
scratches are made until the metal is visible, it may
cause leakage. Please be careful.

Fluids for which a Kammprofile gasket (clad with expandedgraphite) is not suitable.

Classification

Name of fluid

Oxidizing acid

Nitric acid, concentrated acid, hot sulfuric acid,
chromic acid, mixed acid,etc.

Oxidizing salt

Nitrate, chloride, hypochlorite, etc.

Halogen compound

Bromine, fluorine, iodine, chlorine dioxide, etc.

Combustible gas

Oxygen (pure oxygen)

Pastes and other sealing materials

The recommended surface roughness according to JIS
B2220-2012 is as follows.
· For sealing liquid : 6.3μm Ra max· For sealing gas : 3.2μm Ra max

Cloth gaskets

Precautions for use● As a general rule, Kammprofile gaskets with expandedgraphite cannot be used for the fluids shown in thetable on the right.
GA S K E T S

53Metal jacketed gaskets
A gasket in which a heat-resistant cushion material is jacketed with a thin metal plate. It is manufactured invarious shapes and covering methods depending on the application and location to be use. It is used forhigh temperature joint flanges, manholes, etc. for heat exchangers, pressure vessels, tower tanks, equipment, valves, etc.
When ordering

Jacketed metal

Please specify the product number (TOMBO No.).
For heat exchangers, please specify the shape of the gasket.

Filler material

TOMBO No.1841
Jacketed metal

Filler material

The gasket shape for the heat exchanger

TOMBO No.1861

TOMBO No. indication
TOMBO No.

54

FI

S

GR

Shape

Filler material

Metal jacketed material

Facing materialindication
symbolFlat

1841

CorrugatedGAS K ET S

When ordering, please specify the product specifications (TOMBO No.) as below.

1841

Shape

1861

P54

Filler materialindication
symbolMetal jacketed indicationmaterial
symbolFacingmaterial

indication
symbolMillboardNo symbpl

No symbpl

carbon steel

S

None

Millboard for high temperatureFI

304 stainless steel

E

Expanded graphite

Expanded graphiteGR

316 stainless steel

G

310S stainless steel

V

AluminumA

copperC

Alloy 400

M

other than the aboveZ* Please contact us for materials otherthan the above.

GR

A type in which expandedgraphite tape is attached to thesealing surface. (Maximum
operating temperature: 400°C)

Semi-metallic gaskets■ Maximum service temperaturetemperate [℃]

Jacketed material

Millboard

530

carbon steel

temperate [℃]535

Millboard for high temperature

1300

304 stainless steel

800

Expanded graphite

400

316 stainless steel

800

copper400

Aluminum

400

310S stainless steel

1150

Alloy 400

800

Sheet gaskets

Filler material* Please check the heat resistance of both filler material
and the jacketed material metal when using.

1841-E
1841-G others

1841-C1841-A

1861-S

1861-E
1861-G others

1861-C

1861-A

carbon steel

304 stainless steel
316 stainless steel others

copperAluminum

carbon steel

304 stainless steel
316 stainless steel others

copperAluminum

3.75

3.75

3.50

3.25

3.00

3.50

3.25

2.50

[N/mm2]

52.4

62.1

44.8

38.0

31.0

44.8

38.0

20.0

water/oiltype fluid

39.2

49.0

34.3

29.4

—

—

—

—

Gas
type
fluid

101.4

120.4

76.2

58.8

—

—

—

—

Jacketed material
Gasket factor m[—]Min. design seating stress yMin. seatingstress σ3[N/mm2]

Metallic gaskets

メタルジャケットガスケット

1841-STOMBO No.

Semi-metallic gaskets■ Design criteria■ Standard dimension
Jacketed material

coebon steel

304 stainless steel

316 stainless steel

310S stainless steel

Aluminumcoppermaterial symbol

S

E

G

V

A

C

1480

1180

1180

1180

980

1180

standard dimension

Rubber gaskets[mm]* Indicates the largest diameter of gasket that can be made using a single metal sheet.
If a larger gasket is necessary, we will make it by welding two or more metal sheets together.

Precautions for metal jacketed gasket■ Precautions for use● Gasket contact surface finish· When used for gas-based fluids, use with GRASEAL(expanded graphite) tape or gasket paste (NEVERSEEZ
Nickel Special Grade: Operating temperature: -183-1316°C,etc.).

The recommended surface roughness according to JIS
B2220-2012 is as follows.
· For sealing liquid : 3.2μmRa max· For sealing gas : 1.6μmRa max● For temperature is 400°C or less

● For standard flanges
Metal jacket gaskets are not recommended for standard
flanges as it is difficult to obtain sufficient tightening force.
If it is necessary to use metal jacketed gasket, werecommend that you use a hanger instead of aself-centering type.

· When using for a grooved
flange, the folded side of thegasket shall be installedfacing inside the groove.

Pastes and other sealing materials

Since the sealing surface of the metal jacket gasket ismetal, we recommend TOMBO No.1891 (Kammprofile
gasket), which has good compatibility with the flange andprovides stable sealing performance at temperatures below
400°C.

Cloth gaskets■ Precautions conceming design and selection

Reference standard■ ASME B16.20「Metallic Gaskets for Pipe Flanges」

GA S K E T S

55

Gasket for heat exchangers
Nichias semi-metal gaskets can be manufactured for various heat exchangers.

VORTEX™ gasket

Metal hollow tube

Type of main body

Metal jacketed
Inner ring - branch welding type

Metal jacket
Inner ring - integrated

NA Vortex Gasket, GRASEAL Vortex Gasket, NAFLON Vortex Gasket
material

stainless steel 321

Dimension

4.8 (Tube diameter) ×0.5 (thickness)

Metal hollow tube

Type of ribs
(For thickness 4.5 mm)

TOMBO No.1841(Metal jacketed gasket)

Metal jacketed

The standard is same material with the hoop or inner ring.

Standard shape

10 (width) ×4.7 (thickness)

Kammprofile gasket
It can be manufactured in any shape suitable for heat exchangers.
There is no need for an inner ring or outer ring for reinforcement and there is noworry of disintegration even with a large diameter.

Metal jacketed gasket
It can be manufactured in any shape suitable for heat exchangers.
Install the gasket where the folded surface is in contact with the bottom of theflange groove.

56

GAS K ET S

Semi-metallic gaskets
セミ メタルガ スケット

Shapes of gaskets for heat exchangers
When ordering a gasket for a heat exchanger, please specify the shape with the symbol below or the drawing.
〔HE5〕

O.D.
I.D.

O.D.
I.D.

O.D.
I.D.

O.D.
I.D.

O.D.
I.D.

〔HE6〕

〔HE7〕

〔HE8〕

O.D.
I.D.

O.D.
I.D.

O.D.
I.D.

P

〔HE9〕

〔HE10〕

O.D.
I.D.

O.D.
I.D.

P

W

P

R

P

R

P1

P1

R

R

P

W

R

P

R

R

R

R

R
W

P1

R
P

W

P1

t

t

R

R
R
PP

t

W

t

R

Semi-metallic gaskets

t

R

P P

R

R
P

R

P

R

W

R

W

〔HE4〕

W

〔HE3〕

W

〔HE2〕

Sheet gaskets

〔HE1〕

R
R

O.D.
I.D.

O.D.
I.D.

R

t

R

R

R

R
P

W

R

R

R

R

P

P

R

t

t

W

O.D.
I.D.

P

P

W

W

R
R

t

t

〔HE20〕

O.D.
I.D.

O.D.
I.D.

O.D.
I.D.

O.D.
I.D.

O.D.
I.D.

P1
P1
P P

W

〔HE25〕

O.D.
I.D.

O.D.
I.D.

R

R

W

R

R
R

P1

R
R

W

R

R

P

R

R

R
R

P1

R

R

W

P
P1

R

R

P1

P

R

W

W

t

O.D.
I.D.
P
P

R

R
t

〔HE27〕

O.D.
I.D.

O.D.
I.D.

t

〔HE28〕

R

t

t

P1 P1

● For metal jacket gaskets

O.D.
I.D.
P P

The folded surface is facing down
Pastes and other sealing materials〔HE26〕

R

R

R

R

W

R

P1 P1

P1

R

P P

R

R

P1

W

R

P1

R

W

R

R
R

R

〔HE24〕

t

R

R

t

O.D.
I.D.
P
P

P1

P1
P

R

R

R

Cloth gaskets

R

R〔HE23〕

R

R

R
R〔HE22〕

O.D.
I.D.

R

R

P P

P

〔HE21〕

R

t

t

t

R

R

R

R

R

W

R
R

P1
P1
P P

R

P

R

P

R

R

P

R

R

P

R

W

〔HE19〕W〔HE18〕W〔HE17〕

Rubber gaskets〔HE16〕

R
P〔HE15〕

R

R

R

P1

〔HE14〕

R

R
R

P P

〔HE13〕

O.D.
I.D.
P
P

W

〔HE12〕

O.D.
I.D.
P
P

t

Metallic gaskets〔HE11〕

t

t

t

P

t

R

R
R

R
R

t

t

t

GA S K E T S

57

Semi-metallic gaskets

Points to use properly for semi-metal gaskets
VORTEX gasket

Kammprofile gasket

Metal jacketed gasket

Necessarycan be used with hanger

can be used with hanger

Conformability with flange
Heat resistance
Large diameter workability
Non-sticking to the flange
Necessity of outer ring for centering

Conformability with flange
VORTEX gaskets and Kammprofile gaskets, which have a non-metallic surface, can fill the irregularities of the flange whentightened, and have better sealing properties than metal jacket gaskets.

Heat resistance
VORTEX gaskets and metal jacket gaskets come in a variety that can withstand high temperatures.
VORTEX gaskets are recommended for high temperature conditions. A metal jacketed gasket can also be used for the heat exchanger but retightening is required because the seating stress tends to decrease due to heating.

Large diameter workability
Kammprofile gaskets and metal jacketed gaskets have excellent workability with large diameters because they do not fall apart.

Non-sticking to the flange
The surface layer of the Kammprofile gasket may stick to the flange surface.
Therefore, VORTEX gaskets are recommended for piping where flange space cannot be widened

Necessity of outer ring for centering
If the flange shape is a flat face or raised face, centering is required. It requires an outer ring, but the Kammprofile gasket andmetal jacketed gasket can be centered on a hanger.

What is the “breakage” of vortex gaskets?

What is centering?

A phenomenon in which the hoop and filler fall apart.

Align the gasket with the center of the pipe.

There is a hanger
By aligning with the bolt
holes, the gasket can becentered.

58

GAS K ET S

No hanger
The gasket is off centerProduct3

Metallic gaskets
A gasket made by processing various metal materials into the required shape and dimensions according to theconditions. It is used at high temperature and high pressure conditions and high sealing performance are required.
Sheet gaskets
Semi-metallic gaskets
Metallic gaskets

Metallic gaskets
Ring joint gasket
used for flanges
specified in JPI7S-15, ASME B16.5,
etc.

A flat gasket manufactured by cutting
and lathe processing
from flat plates, roundbars, forged metals,
etc.

P60-P61P62-P64

Rubber gaskets

Ring joint gaskets

Cloth gaskets

Metal O seals
A hollow metal O ring

Pastes and other sealing materials

P65-P67

GA S K E T S

59

Ring joint gaskets
A gasket made by processing various metal materials into the required shape and dimensions according to
the conditions. It is used at high temperature and high pressure conditions.

1850C

TOMBOTM No.

Octagonal ring joint gasket
Application:	Pipe flanges, valves, pressure
vessels, heat exchangers, etc.
under high temperature andhigh pressure which are difficult
to seal with plain metal gaskets.
Service range: Depends on the material

Features

A gasket made by processing forged metal into an octagonal cross section.

The sealing surface of ring joint gasket and the flange groove come into surface contact to exhibit sealing performance.
It can be reused by performing the grinding work*1.
Note 1: Work to finish a smoother surface by rubbing metal surfaces together.

1850V

TOMBOTM No.

Oval ring joint gasket
Application:	Pipe flanges, valves, pressure
vessels, heat exchangers, etc.
that emphasize conformability.
Service range:	Depends on the material

TOMBO No.
TM

Features

製品情報

1850C ／ V

A gasket made by processing forged metal into an oval
cross section.

シリーズ

 ompared to an octagonal type, the sealing surface of this gasket contacts the flange along the line, thus it is easily to fit
Cinto flange groove
but the ring cannot be reused.
リングジョイントガスケット■ Line-up
Shape

Product nameIndication symbol

Octagonal ring joint gasket

C

FeaturesRing joint gasket used for flanges
specified in JPI-7S-15, ASME B16.5, etc.

メタルガスケット60

GAS K ET S

Oval ring joint gasket

V

RX type ring joint gasket

RX

A special octagonal ring joint used forthe 6B flange specified in API spe 6A.

BX type ring joint gasket

BX

A special octagonal ring joint used forthe 6BX flange specified in API spe 6A.

スケット

BX type ring joint gasket

A special octagonal ring joint used forthe 6BX flange specified in API spe 6A.

BX

Metallic gasket■ TOMBO No. indication
TOMBO No.

18 5 0

When ordering, please specify the product specifications (TOMBO No.) as below.

D

Shape

Material

メタ ル ガ ス ケ ット

Indication symbol

Material Note 1 Indication symbol

OctagonalC

Pure iron

D

Oval

V

Dead soft steel

S

RX

RX

5Cr-0.5Mo steel

F

BX

BX

13Cr steelR

304 stainless steel

E

304L stainless steelL

316 stainless steel

G■ Metallic material and service temperature 316L stainless steel
Material
symbolMaterialMax. service
temperature [ ˚C ]321 Max.
stainlesssteel
hardness
HB steel
347 stainlessDiron (Softmaterial
iron)
Metallic
and service
temperature Alloy 400 90■ Pure538

Dead soft steel (Low-carbon-steel)
5Cr-0.5Mo steel
Material

538

Max.649
servicetemperature [ ˚C ]
704
538
816

R
D
E

13Cr steel
Purestainlessiron (Softsteel
iron)
304

Nickel120

Max. hardness130

Titanium

HB

304
stainless steel
AlloyL400
316
stainlesssteel
Nickel

L
M
G
N

816
800
816
760

150
(130)
160
(120)

316 L stainless steel
Titanium
321 stainless steel

H
T
J

816
800
816

150
(140)
160

347 stainless steel

K

538
S
steelmaterial(Low-carbon-steel)
Metallic
and service
temperature
816
L
304
L softstainlesssteel■ Dead5Cr-0.5Mo
steel
316 stainless
steel
13Cr
steel
Material
316 L stainless
steel

304
321 stainlessstainless steel
steel
Pure
iron
(Soft iron)304
Lstainlesssteel
347 stainless steel
Deadsoft steel(Low-carbon-steel)316
stainlesssteel
Alloy 400
5Cr-0.5Mo
steel
316
L stainless steel
Nickel
13Crstainless
steel
321
steel
Titanium304
stainless347 stainless steel
steel

F
G
R
MaterialH
symbolGasketcontact surface finish
M
400■ AlloyN
TheNickel
recommended surface roughness is as follows.
T· Titanium
For sealing liquid : 1.6μmRa max· For sealing gas : 1.6μmRa max

816

160

800

(130)

760

(120)

800

(140)

H
J * The material is based on JPI-7S-23
Note Gaskets
1: Other metalmaterials“Ring-Joint
and Grooves
forarealso manufactured as
K Petroleum Industry”.
specified. It is recomM * ( ) Is a reference value.
mended that the gasket
N * Pleasecontact
us madefor theavailability
a Brinell of
The material
is be
based
onofJPI-7S-23
that
arenotandlisted.
hardness(HB)
that is“Ring-Joint
Gaskets
Groovesfor30
T materials
to 40 degrees softer thanPetroleum Industry”.
Zthe flange material.
* ( ) Is a reference value.

* Please contact us for the availability ofmaterials that are not listed.
* The material is based on JPI-7S-23“Ring-Joint Gaskets and Grooves for
Petroleum Industry”.

メタルガス
メケ
タッ
ルRubberト
ガ スgaskets
ケメッタト
ル ガ ス ケ ッ ト Cloth gaskets

E
J
D
L
K
S
G
M
F
H
N
R
J
T
E
K

649
816
Max.704
service816
temperature [ ˚C ]
816
816
538
816
816
538
816
800
649
816
760
704
816
800
816
816

Materials 170
other than
the above 90
160
120
150
130
160
Max. hardness
170
150
HB
160
160
90
150
160
120
160
(130)
130
150
(120)
170
160
(140)
160
160

メタ ル ガ ス ケ ット

Metallic gaskets

S

MaterialF
symbolメタ ル ガ ス ケ ット

Semi-metallic gaskets

Shape

Sheet gasketsC* ( ) Is a reference value.
* Please contact us for the availability ofmaterials that are not listed.

■ Gasket contact surface finish
The recommended surface roughness is as follows.
· For sealing liquid : 1.6μmRa max· For sealing gas : 1.6μmRa max

Ring joint
gaskets
contact
surface finish■ GasketMin. design seating stress y[N/mm2]

124.2

1850C-F, 1850V-F

1850C-E, 1850C-G
1850V-E, 1850V-G, others

F5

Stainless steel

6.00

6.50

150.3

179.3

Pastes and other sealing materials

The recommended
surfacefollows. 1850V-D
TOMBO™
No.roughness is as
1850C-D,
1850C-S, 1850V-S· For sealing liquid : 1.6μmRa max
Pure iron
Mild steel
Material· For sealing gas : 1.6μmRa max[─]
5.50
Gasket coefficient m

Applicable standard■ JPI-7S-23“Ring-Joint Gaskets and Grooves for Petroleum Industry”. (TOMBO No.1850C, 1850V)■ ASME B16.20

Applicable standard「Metallic Gaskets for Pipe Flanges」(TOMBO No.1850C, 1850V, 1850RX, 1850BX)■ API spec 6A■ JPI-7S-23「Specification for Wellhead and Christmas Tree Equipment」(TOMBO No.1850C, 1850V, 1850RX, 1850BX)“Ring-Joint Gaskets and Grooves for Petroleum Industry”. (TOMBO No.1850C, 1850V)■ ASME B16.20

GA S K E T S

61

TOMBO No.
Metallic
gaskets
製品情報
TM

1850P ／ D ／ L ／ 1890

メタルガスケット■ Line-up
TM
TOMBO

1850P

Plain metallic gasket

No.

Shape

Product nameFeatures

Indication symbol

Application:	
Pipe flanges, valves, pressure vessels,
heat exchangers, etc. under hightemperature
anda highpressure
Flat metallic
gasket withsquarecross section
conditions where the flange cannot beprocessed into the specified shape.

Ｐ

Plain metallic gasket

Service use:	Depends on the material

D

Delta metallic gasket

Plain type gasket madeLensby flatprocessing
metal.
shapedmetallic
gasketFeatures

メタルガスケット

Self-sealing
gasketwith triangularcross section
A flatgasketmanufactured
Construction:	by(Delta ring)lathe processing by cutting out
from flat plates, round bars,
forged metals,
etc.
High pressure
metal self-sealing
gasket(lens ring) that has a cross-sectional
shape with the lens shaped cross section
and makes line contact with the flange.

L

High seating stress is required to ensure good sealing with the flange

1890

Double cone shaped metallic gasket

TOMBOTM No.

High pressure metal self-sealing gasket
with double conical cross section

No symbol

Serrated metallic gasket

Application:

Bridgeman shaped metallic gasketF or pipe flanges, valves, pressure

vessels, heatexchangers,
that
Metal self-seal
gasketfor high etc.
pressurerequiredw i t h we
d g e - stoh obtaina p e d betterc r o s ssealing
sectionperformance(pressureseal, sealwithring)the same

No symbol

tightening force as plain gaskets.
Service range: Depends on the material

FeaturesRound metallic gasket

flat metal
MetallicAgasket
with gasket
a round withcross section
No symbolConstruction:	

triangular grooves processed
concentrically and a gasket witha sawtooth cross section.

Compared to flat metalSerrated
gaskets, its
shape gasket
provides higher sealing
metallic
No performance.
symbolMetallic gasket with a sawtooth cross section
This gasket can withstand high seating stress, however the flange surface sometimes could be damaged.
* Please contact us for shapes other than the above.

■ TOMBO No. indication

1850
TOMBO No. 1890
TOMBO No.

Type of product

Type of product Indication symbol

Shape

When ordering, please specify the product specifications (TOMBO No.) as below.

Ｐ

Ｓ
Ｓ

Ｆ

Shape

Materials

Special treatment

Indication symbol

Materials Note 1 Indication symbol Materials

Indication symbol

Ｆ

1850

Plane

P

Pure ironD

321 stainless steel

J

Polishing

Serrated type

1890

Delta

D

Dead soft steelS

347 stainless steel

K

None

Lens shapedL

5Cr-0.5Mo steel

F

Alloy 400

M

13Cr steel

R

NickelN

304 stainless steel E

TitaniumT

304L stainless steel L

AluminumA

CopperC* In order to improve
conformability, it can beapplied only to TOMBO
No.1850P-S by polishing
the sealing surface withconcentric circles.

Materials other than the above

Z

OthersNo indication symbol

Other than TOMBO 1890

316 stainless steelG

316L stainless steel H

Note 1: Other metal materials are also manufactured as specified. It is
recommended that the gasket be made of a Brinell hardness(HB) that is 30 to 40 degrees softer than the flange material.

62

Special treatment Indication symbol

Other than serrated typeGAS K ET S

No indication symbol

TOMBO No.
TM

製品情報

1850P ／ D ／ L ／ 1890

Metallic gasket

メタルガスケット

Shape

Product name

Sheet gaskets■ Line-upＰ

Flat metallic gasket with a square cross section

Delta metallic gasket

D

Self-sealing gasket with triangular cross section(Delta ring)L

High pressure metal self-sealing gasket(lens ring) that has a cross-sectional
shape with the lens shaped cross section
and makes line contact with the flange.

Double cone shaped metallic gasket

No symbol

High pressure metal self-sealing gasket
with double conical cross section

Bridgeman shaped metallic gasket

No symbol

Metal self-seal gasket for high pressure
w i t h we d g e - s h a p e d c r o s s s e c t i o n(pressure seal, seal ring)

Round metallic gasket

No symbol

Metallic gasket with a round cross section

Serrated metallic gasket

No symbol

Metallic gasket with a sawtooth cross section

Lens shaped metallic gasket

Rubber gaskets

Plain metallic gasket

Metallic gaskets

Features

Semi-metallic gaskets

メタルガスケット

Indication symbol* Please contact us for shapes other than the above.

■ TOMBO No. indication

When ordering, please specify the product specifications (TOMBO No.) as below.

Ｐ

1850
TOMBO No.
TOMBO™
No.
1890

PlainNo.
type metallic gaskets
TOMBO
Material

1850P-S

Gasket coefficient m[─]

304 stainless steel, 316 stainless steel, others

Copper

5.50

6.50

4.75

[N/mm ]

TypeMin.
of productIndication
symbolseating
stressσ3

Water-type andShapeoil-type
fluids98.1
Indication symbol

Materials

Plane fluids
Gas-type

P 235.4

Pure iron

Delta

D

Lens shaped

L

2

1850

Serrated type

1890

2

124.2

Serrated metallic
Othergaskets
than TOMBO 1890
TOMBO™ No.

1890-S

Material
Gasket coefficient m
Min. design seating stress y

Carbon steel
[─]

3.75

2

52.4

[N/mm ]

Materials

179.3
Note 1

1850P-A
AluminumSpecial treatment
4.00

89.6

117.7symbol Materials
Indication

58.8 symbol
Indication

Special treatment39.2
Indication symbol
Ｆ

D
343.2

321 stainless steel

Dead soft steelS

347 stainless steel

K

None

5Cr-0.5Mo steel

F

Alloy 400

M

13Cr steel

R

NickelN

304 stainless steel E

TitaniumT

304L stainless steel L

Aluminum* In order to improve
conformability, it can beapplied only to TOMBO
No.1850P-S by polishing
the sealing surface withconcentric1890-A
circles.

1890-E, 1890-G, others

J
98.1

60.7

A

1890-CC
CopperZ
4.25
3.50
Note 1: Other metal materials are also manufactured as specified. It is
44.8
recommended69.6
that the gasket be made of a Brinell
hardness(HB) that is 30 to 40 degrees softer than the flange material.
G
304 stainless steel, 316 stainless steel, others

316 stainless steel

Copper

316L stainless steel H

Materials other than the above

Polishing

78.5

No indication symbol

Pastes and other sealing materials

No indication symbol

Others1850P-C

Carbon steel

Shape

Min. design seating stress y
Other[N/mmthan serrated] typeＦ
Cloth gaskets

Type of product

Ｓ
1850P-E, P-G, others
Ｓ

Aluminum
3.25
38.0

GA S K E T S

63

メタ ル ガ ス ケ ット

Metallic gasket■ 金属材質と使用可能温度
材

材質
記号

質

最高使用温度［℃］

硬さ注 1

Type of metal and service temperature
538

HB

HV

90

−

極軟鋼（Low-carbon-steel）

140
120Hardness

純鉄（Soft iron）

Ｄ

Material

5Cr-0.5Mo 鋼

注1

[˚C]
temperature
649

HB
130

−HV

Ｄ
Ｒ

538
704

90
170

190－

538
816

120
160

140
180

649
816

130
150

170－

704
816

170
160

190
180

816
816

160
150

180
170

Ｌ
Ｊ

816
816

150
160

170
180

816
816

160
160

180
180

Ｈ
Ｍ

816
800

150
（130）

170
150

816
760

160
（120）

180
140

816
800

160
（140）

180
180

800
300

(130)
―

40150

760
400

(120)
―

80140

Ｆ

Soft
13Criron
鋼

Ｓ
Ｅ

Low-carbon-steel
304 鋼

Ｆ
Ｌ

5Cr-0.5Mo
304Ｌ鋼 steel

Ｒ
Ｇ

13Cr
steel
316 鋼

Ｅ
Ｈ

304
stainless steel
316Ｌ鋼
304Ｌ
321 鋼stainless steel

Ｇ
Ｋ

316
steel
347stainless
鋼
316Ｌ
stainless steel
Alloy400

ＪＮ

321
stainless steel
ニッケル

Ｋ
Ｔ

347
stainless steel
チタン

Ｍ
Ａ

Alloy400
アルミニウムＮ
Ｃ

Nickel銅
Titanium

Ｔ

800

(140)

180

Aluminum

Ａ

300

―

40

■Copper
製作範囲

Ｃ

TOMBO NO.1850P-D と
TOMBO NO.1850P-S-F の製作範囲
製品厚さ

1850P-S-F

1.6mm 未満）
内は参考値。

※ 記載のない材質の製作可否についてはお問い合
わせください。

■ ガスケット座の仕上げ
400
80
―

Note 1: Hardness HB is based on
JPI-7S-23 “Ring-Joint Gaskets
and Grooves for Petroleum
Industry” when forged material isused as a material.
HV is the standard hardness
when using steel plate.
* ( ) Is a reference value.
* Please contact us for the availability ofmaterials that are not listed.

ガスケット座は旋削仕上げとし、推奨表面粗さは次のとおりです。
・液体シールの場合：1.6μmRa 以下
Gasket contact surface finish
・ガスシールの場合：1.6μmRa 以下

Production range
TOMBO No.

※（The recommended surface roughness is as follows.
Production range of TOMBO NO.1850P-D
1.6mm 以上1850P-DFor sealing liquid: 1.6μmRa max
and TOMBO NO.1850P-S-F■ 使用上の注意事項
For sealing gas: 1.6μmRa max

ガス、真空および揮発性流体のシールにはガスケットペースト（ネバーシーズ ニッケルTOMBO（口径、No. 幅）によっては製作でき
Gasket thickness※ 上記以外でも寸法スペシャルグレード：使用温度 -183〜1316℃）などの併用を推奨します。
る場合がありますのでお問い合わせください。
1850P-D
1.6mm and above
1850P-S-F

1.6mm and below* Other than the above dimensions (nominal size, width), we may
be able to manufacture, so please contact us.

Precautions for use

It is recommended to use together with gasket paste for sealinggas, vacuum and volatile fluids (Neverseez Nickel Special Grade:
Operating Temperature -183 ~1316˚C)

Blinds, spacers, spectacle blinds
We also manufacture spectacle blinds that are integrated with blinds and spacers that are used together withvarious gaskets to block pipes and to shut off pressure during sealing and pressure resistance tests. Some areintegrated with the ring joint gasket. Please specify the material, dimensions, etc.
shape
TOMBO No.1850-BL
blind
TOMBO No.1850-SP
spacer
TOMBO No.1850-SB
spectacle bilnd

64

GAS K ET S

RF type

RTJ type

メタルガスケットＳ
Material
symbolMax.538
Service

注 1：硬さＨＢは鍛造材を材料として用いる場合で、JPI-7S-23「石油工業用リングジョイントガス
ケット及び溝」に基づいています。
ＨＶは鋼板を用いる場合の標準的な硬さです。

Metal O seals

9200P

9200V

TOMBOTM No.

TOMBOTM No.

Standard Metal O seal

Vent hole type Metal O seal
Sheet gaskets
Semi-metallic gaskets

9200 シリーズ

Structure: gasket in which a metal thin tube is formed into an O-ring shape, the end face is welded, and the surface is
A
TM
TOMBO
No.
ultra-smoothfinished.
製品情報
TOMBO No.9200V has two or more small holes on the inside (for internal pressure) or outside (for externalpressure)of the ring,and fluid enters the ring, exhibits self-sealing performance.
O シール
メタル
S
 ince it is used by putting it in a groove and closing it, a high-pressure seal can be made with a small tightening force.

Usage:

Equipment fittings, processing machines, compression equipment, and various engines that require a compact design.
TOMBO No.9200P… Fluid from vacuum to about 7.0MPa.
メタルＯシールはつぶし（圧縮）による反力でシールする
穴あき型
TOMBO No.9200V… High pressure seal of 7.0MPa or more. 単 純 型

Metallic gaskets

ガスケットです。穴あき型はリングの中空部分に入り込ん
Service range: Depends on the material

だ流 体によりシール性が高められるため、7MPa 以 上のFeatures

高圧では穴あき型をお勧めします。

Stable and high sealing performance can be obtained over a wide range from high temperature to low temperature andhigh pressure to vacuum.
PTFE coating or silver plating specifications are recommended for gases, vacuum and highly volatile fluids.

■ TOMBO No. indication

9200

P

J

AG

Shape

Tube material

Surface treatment material

Rubber gaskets

メタルガスケットTOMBO No.

When ordering, please specify the product specifications (TOMBO No.) as below.

[Reference: old material symbol]

Shapeindication symbol

Tube material indication symbol

Surface treatment material indication symbol
No symbol

321 stainless steel

321

Alloy 600

InP

321 stainless steel

J

None

vent hole type

V

Alloy 600

Y

Silver platingAG

Silver plating

Ag

PTFE coating

TF

PTFE coating

TFE

Cloth gaskets

standard type

■ Service range
Tube material Note 1

Surface treatment Note 2 Service temperature range［℃］ Service pressure

321 stainless steel

Silver plating
PTFE coating
None

Alloy 600

Silver plating
PTFE coating−250〜500−250〜250−250〜700−250〜250■ 締付基準チューブ 断 面 径 ［mm］

肉

厚［mm］

圧 縮 荷 重 ［N/mm］

High water pressure:
400MPaHigh pressure gas:
300MPaVacuum: 10 -4 Pa

Pastes and other sealing materials

None

Note 1: Metal O seals can only
be manufactured from321 stainless steel andAlloy 600.
Note 2: The surface treatment
thickness is 0.03 to
0.05 mm. Surface
treatment should beapplied to gas, vacuum
and volatile fluid seals.

GA S K E T S
実際の締付荷重は、流体圧力によるエンドフォース分の荷重（Wa）と圧縮荷重（Y）から算出した荷重（Wb）を足し合わ

65Metal O seals

Line-upStandard type

Vent hole typeFor high pressure of 7.0MPa and above, we recommend thevent hole type.

Tightening criteria
For the actual tightening load, apply the sum of the load (Wx) for the end force due to the fluid pressure and the load (Wy) calculated from the compression load (Y) as the minimum tightening load. We recommend to apply safety factor to this value.
Tube cross section diameter［mm］

Wall thickness［mm］

φ0.8

0.15

69

0.25

118

0.36

284

0.25

59

0.46

235

0.25

49

0.35

88

0.5

177

φ1.6
φ2.4

φ3.2

φ4.8
φ6.4

Compression load［N/mm］

0.5

69

0.8

333

0.8

177

Tube cross[mm]
section diameter
φ0.8
Total minimum tightening load
Ｗ = Wx + Wy
φ1.6
π
2
=─
4 G P + πGY
W : Total bolt load [N]φ2.4
G : Gasket O.D [mm]
P : Pressure [MPa]
Y : Compression load [N/mm]
φ3.2* Compressive load indicates the load required to close the flange.

Standard dimension
Tube cross[mm]
section diameter
φ0.8
φ1.6
φ2.4

φ3.2

φ4.8

Wall thickness [mm]Range of outer diameter [mm]recommended service range Manufacturable dimensions

0.15

6 〜 25

6 〜 300.25

─12 〜 200

0.36

15 〜 50

11 〜 200

0.25

─

40 〜 500

0.46

40 〜 200

20 〜 500

0.25

─

60 〜 1270

0.35 Note 1

─60 〜 1270

65 〜 700

40 〜 1270

─

150 〜 1500

0.8

500 〜 1200

150 〜 1500

0.81000 〜 1500

250 〜 1500 Note 2

0.5

φ4.8
φ6.4

0.5

Note 1

Note 1: The tube material that can be manufactured is only 321 stainless steel.
Note 2: Please contact us if it exceeds 1500mm.
*
*
*

66

GAS K ET S

Indicates standard wall thickness. For gas seals, use standard wall thickness.
The minimum outer diameter of the vent hole type is φ10.
The maximum outer diameter of PTFE coating is φ630, and the maximum outer diameter of silver plating is φ1300.
Please contact us for more information.

Minimum value of corner
R in the case of a square
φ6.4
gasketNote 1: The tube material that can be mNote 2:
Please contact us if it exceeds 1
For standard
wall
area)
thickness* (Indicates standard wall thickness.
The≥ minimum
Radius of* I.D side
6 times outer diameter of th*
The maximum outer diameter of P
the O.D of
the tube

Please contact us for more inform

For wall thickness that isless than standard wall
thickness
Radius of I.D side ≥ 8 times
the O.D of the tube

Metallic gasket

メタ ル ガ ス ケ ット

■ 標準寸法チューブ 断 面 径 ［mm］

Without surface treatment

肉

φ0.8

外 径 寸 法 範 囲［mm］

厚［mm］

推奨使用範囲製作可能寸法

6〜

6〜

0.15

25

Tube cross
For internal pressure For external pressure Groove radius (R)0.25
─ ［mm］
section diameter
seal Groove O.D
seal Groove I.D
φ1.6
［mm］

φ0.8 φ2.4

A

φ1.6 φ3.2

A

φ2.4

A
φ4.8

φ3.2 φ6.4

A

15 〜 Maximum
50

［mm］

0.36

+0.35

0.25

+0.25

0.46

+0.40

0.25

+0.30

0.35 注 1

+0.40

0.5

+0.30

0.5 注 1

+0.50

0.8

+0.35

0.8

(A−1.6)(A−3.2)(A−4.8)(A−6.4)

−0.25

─

−0.35

40 〜

−0.30

─

−0.40

─

−0.30

65 〜

−0.40

─

−0.35

500 〜 1200

40 〜

0.2

+0.55
注１： 製作可能なチューブ材質は 321 鋼のみです。
A
φ6.4を超える場合はご相談ください。
注２：1500mm(A−12.8)500

1.2 min1.1

0.60±0.05

2.0

1.15±0.05

2.91.75±0.05

4.8 min

3.7

2.55±0.05

7.2 min

5.6

3.75±0.05

7.5

5.00±0.05

20 〜

500

60 〜 1270

0.3

2.4 min60 〜 1270
40 〜 1270

700

0.5

3.6 min150 〜 1500
150 〜 1500

0.8

−0.50 1000 〜 1500

250 〜 1500 注 2

0.8

−0.50

メ タ ル ガMetallic
ス ケgaskets
ット(A−9.6)

+0.35

部分）

Groove depth (H)12Groove〜 200width (W) [mm]
標準肉厚より薄肉の場合[mm]
11 〜 200
チューブ断面径の 8 倍≦内径側の R
Recommended
Minimum200

標準肉厚を示します。ガスシールの場合は標準肉厚をご使用ください。
+0.50
−0.35

A
φ4.8
穴あき型の最小外径はφ10mmです。

標準肉厚の場合（

チューブ断面径の 6 倍≦内径側の R

Semi-metallic gaskets

［mm］

30

角形の場合のコーナー部
Ｒの最小値

Sheet gaskets

Groove dimensions

PTFE コーティングの最大外径はφ630mm、銀めっきはφ1300mmです。これ以上についてはご相談ください。

+0.40

−0.40

0.8

−0.55

9.6 minWith coating / plating■ 溝寸法

For internal pressure For external pressure Groove radius (R)Tube cross
Groove width (W) [mm]［mm］
seal Groove 内圧シールの場合
O.D
seal Groove I.D
section diameter
外圧シールの場合
溝 幅（W）注 1［mm］
チューブ［mm］ 断 面 径［mm］［mm］(A+0.1)

φ1.6 φ1.6(A+0.1)

φ2.4 φ2.4(A+0.1)

φ3.2 φ3.2(A+0.1)

φ4.8 φ4.8(A+0.1)

φ6.4 φ6.4(A+0.1)

+0.35
+0.25

A

+0.35(A−1.7)

A+0.40(A−3.3)A+0.40(A−4.9)

A+0.50(A−6.5)

A+0.50(A−9.7)

A

+0.55
(A−12.9)

+0.40
+0.30
+0.40
+0.30
+0.50
+0.35
+0.50
+0.35
+0.55
+0.40

+0.25

+0.30

+0.30

+0.35

+0.35

+0.40

Maximum［mm］
溝内径（ID）−0.25（A−1.6）

−0.35
−0.30

（A−3.2）

−0.40
−0.30

（A−4.8）

−0.40
−0.35

（A−6.4）

−0.50
−0.35

（A−9.6）

−0.50
−0.40

（A−12.8）−0.55

Recommended

推奨

最小

（H）
溝深さ
Minimum

最大

−0.25
0.2

1.2 以上1.3 min 1.1

1.2
0.60 ± 0.05

0.70±0.05
0.2

−0.30
0.3

2.4 以上2.5 min 2.0

2.1
1.15 ± 0.05

1.25±0.05
0.3

−0.30
0.5

3.6 以上3.7 min 2.9

3.0
1.75 ± 0.05

1.85±0.05
0.5

−0.35
0.8

4.8 以上4.9 min 3.7

3.8
2.55 ± 0.05

2.65±0.05
0.8

−0.35
0.8

7.2 以上7.3 min 5.6

5.7
3.75 ± 0.05

3.85±0.05
0.8

−0.40
0.8

9.6 以上9.7 min 7.5

7.6
5.00 ± 0.05

5.10±0.05
0.8

−0.35

−0.40

−0.40

−0.50

−0.50

−0.55

Rubber gaskets

φ0.8 φ0.8

［mm］
［mm］
溝外径（OD）

Groove depth (H)
［mm］
溝隅（R）
[mm]

注 1［mm］

Cloth gaskets［A=ガスケットの外径］
A = O.D of gasket

注 1：PTFE コーティングまたは銀めっきしたガスケットを用いる
場合は、溝の寸法を次のように変更します。

External pressure sealInternal pressure seal・溝幅（W）および溝深さ（H）を 0.1mm 加算します。

φA・溝幅が狭いとガスケットの取り外しが難しくなりますので、幅広をお勧めします。

φA
1.6a

H

1.6a

H

R

R
W

W
φ
ＩD

Pastes and other sealing materials

φＯD■ Gasket contact surface finish
The Gasket
recommended
surface roughnessis asfollows.
contact
surfacefinish・Fo gas seal or vacuum：0.8μmRa 以下
・Other cases：1.6μmRa 以下

The recommended surface roughness is as follows.
Fo gas seal or vacuum: 0.8μmRa max
Other cases: 1.6μmRa max

GA S K E T S

67

Rubber gaskets
Since it is made of elastic rubber as a base material, it has a feature that it fits well with the flange even at alow seating stress.

1050/1051 Rubber cut gaskets

TOMBOTM No.

TOMBO No. 1050

TOMBO No. 1051

Polyester cloth

Features

A gasket is formed by cutting a rubber
sheet into gasket shape

A gasket is made by cutting rubber
sheet reinforced with polyester cloth
into gasket shape.

A gasket that can be sealed with low seating stress due to the elasticity, resilience, and conformability of rubber.

1050 ／ 1051

* Since TOMBO No. 1051 is reinforced with a polyester layer, the bulging from the flange is small. However, this gasket is not suitable for gas seal beTM
cause leakage due TOMBO
to permeation isNo.
liable to occur.

製品情報

Service temperature range: Depends on the rubber material
ゴム打抜きガスケット
Maximum service pressure:
Maximum working pressure 1.0MPa■ Standard dimensions■ Design criteria
Gasket factor m

1.5

Min. design seating stress y

2.0

Min. seating stress σ3

φ1000

1000

[N/mm2]

5.0

Allowable seating stress

10.0

1050

1051

(HS Note 1 less than 75) (HS Note 1 75 or more)

1.0

3.0

[─]

0.50

1.00

1.25

[N/mm2]

0.0

1.4

2.8

water oil type fluids

1.5

2.0

2.9

gas type fluid

2.0

2.9

─

[N/mm2]

14.7

14.7

14.7

Note 1: Hardness of rubber (by Type A durometer)* The minimum thickness of 1051-NR gasket is
1.5mm■ Gasket contact surface finish

ゴム質ガスケットThe recommended surface roughness is as follows.
・For sealing liquid：12.5μmRa max
・For sealing gas：12.5μmRa max■ Standard materials
NICHIASmatenal service temperature range［℃］code

Material

TOMBO No.

1050

1051

Nitrile rubber(oil resistant)

NBR−30 ~ 120●●

Chloroprene(weather resistant)CR−30 ~ 120●●

Ethylene-propylene rubber (weather and vapor resistant)EP−40 ~ 150●

─

Butyl rubber (weather resistant, acid resistant, and vapor resistant)

IIR−30 ~ 150●

─

Silicone rubber (weather resistant and cold resistant)SI−50 ~ 200●─

(heat resistant)FA−15 ~ 200

●

─

FS

0 ~ 200●─NR−20 ~ 100●●

Fluorine rubber
Fluoro rubber(corrosion resistant)Natural rubber

68

1050

TOMBO No.

thickness［mm］width［mm］ max O.D.［mm］

GAS K ET S

製品情報

TOMBO No.
TM

9013 シリーズ

■ Standard dimension

φA
φB
PTFE
（0.3t）TOMBO No.

φC

φA

φB

φC

8A

─

─

─

34.0

27.5

10.5

10A

─

─

─

34.0

27.5

14.0

15A

─

─

─

34.0

27.5

17.5

1B

TM 32.5

49.5（49.0）

43.5

D

φB

TOMBO No.9014-A（For screw coupling）

1 1/ 2 B

46.0

42.7

35.6

49.5
（49.2）

43.5

35.8

2B

59.5

56.2

47.8

63.0
（62.5）

56.5

48.0

2 1/ 2 B

73.0

69.9

59.5

76.5

70.5

59.7

3B

86.5

82.6

72.1

90.0

83.5

72.3

3 1/ 2 B

─

─

─

105.0

97.0

85.2

112.5

108.3

97.6

118.0

110.0

97.8

23.1

2.0

rubber（EPDM）
φC

1.7

D

5.3

PTFE
（0.3t）
φA

φB

R1.2

Semi-metallic gaskets
ゴム質ガ
スケット

No.

23.0

φC

rubber（EPDM）

5.0

2670/2675 Rubber O-ring / BLAZER™ O-ring

TOMBO

29.2

4B

Rubber gaskets
4.8

φB

Sheet gaskets

φA

6.5

9014-B／ BW (for ferrule)［mm］

5.5

9014-A (for screw coupling)［mm］

1.7

Nominaldimension

TOMBO No.9014-B ／ BW（For ferrule）* For sizes with different standard dimensions for B type and BW type the numbers in parentheses
A rubber O-ring made by molding various elastic rubber.
indicate the standard dimensions for BW type. Also, 3 1/2 B is only B type.
FeaturesIt has excellent compatibility and can seal from vacuum to high pressure of about 25MPa even with a small tightening load.

2670 ／ 2675

Can be used as a gasket by putting it in a groove other than the shaft seal (packing).

TM
Service temperature range:
Depends
TOMBO
No.on the rubber material
製品
情報
Maximum service pressure: 25MPa *Considering the clearance and backup ring, it can be used even at 25MPa or more.

ゴム O リング

Metallic gaskets■ Standard dimensions●JIS B2401 “O-rings” ●AS 568B “Aerospace size standards for O rings” ●JIS B8365 “Dimension of Clamped
type Vacuum Couplings”■ Service temperature and basic physical properties
ASTM abbreviation (type of rubber)

FFKM

Special FKM

BLAZER BLAZER BLAZER BLAZER BLAZER
Next
A
S2
FC
FE

Material name

A

S2

FC

FE

FluororubberFB

FluororubberFA

Silionerubber

FB

FA

SI

EPDM

CR

NBR

Ethylene Chloroprene Nitrile
propylenerubberrubberrubberEP

CR

NBR

Acid and steam
Weather and water Weather and oil
Heat resistant Chemical resistant Steam resistant Plasma resistant Plasma resistantHeat resistant Heat resistantMineral oil resistantresistantresistantresistantFeatures─JIS classcolor
Service temperature range

［℃］

─

─

─

─

─

FKM-70

VMQ-70 EPDM-70

─

NBR-70-1

black

black

black

black

black

black

black

reddish brown

black

black

black

0~335

0~210

0~320

0~200

0~200

0~200

−15~200−50~200−40~150−30~120−30~120

76

75

80

60

60

70

69

70

70

67

68

［MPa］

11.1

13.1

15.3

18.8

11.4

15.7

15.3

6.3

15.3

12.8

16.4

［%］

140

150

198

210

230

460

300

260

280

260

300

Tensile stress ［100% elongation］

8.3

6.4

15.6

3.9

3.5

2.8

3.3

─

─

4.2

3.0

Compression Temperature x time ［℃］×［hrs］ 300×72
set
［％］
26
characteristics Compression set

150×72300×72

100×72

100×72

175×24200×72

175×72

100×72

100×72120×72

20

45

9

9

20

22

27

8

29

13

Temperature x time ［℃］×［hrs］

─

─

─

─

─

230×24230×24230×72

100×72

100×72120×72Type A Durometer Hardness change

physicalproperties

Tensile strength
Elongation

─

─

─

─

─

0

+1

−6

+1

+9

+4

resistance Rate of change in tensile strength［％］

─

─

─

─

─

−13.0

−5

−8

+9

+8

−3

Rate of change in elongation［％］

─

─

─

─

─

−6.0

0

−23

+4

−23

−29

Aging

Cloth gaskets

Type A Durometer Hardness

NormalRubber gaskets

BNX

NICHIAS material symbol

Q

FKM

GA S K E T S

Pastes and other sealing materials

Measured by: NICHIAS* The above values are actual measurements, not standard values.
* The Table above indicates the general physical properties of rubber O rings. For more details, please refer to “Rubber O rings” catalog.
* In addition to the above, there are butyl rubber (IIR) and hydrogenated nitrile rubber (ZR).

69

Rubber gaskets

TOMBO No.
TM

製品情報1050 ／ 1051

ゴム打抜きガスケット

EBILON™
gasketcriteria■ Design
9013/9013-D

No.dimensions
Standard■TOMBO
TM

1050

TOMBO No.

thickness［mm］width［mm］ max O.D.［mm］
1.0

Gasket factor m

1.5

Min. design seating stress y

2.0
3.0

rubberMin. seating stress σ3

φ1000

1000

[N/mm2]

5.0

Allowable seating stress

10.0

1050

1051

(HS Note 1 less than 75) (HS Note 1 75 or more)
[─]

0.50

1.00

1.25

[N/mm2]

0.0

1.4

2.8

water oil type fluids

1.5

2.0

2.9

gas type fluid

2.0

2.9

─

[N/mm2]

14.7

14.7

14.7

Note 1: Hardness of rubber (by Type AGasket
durometer)with a rubber core integrated with a pressunzed
PTFE* The minimum thickness of 1051-NR gasket is
1.5mm

and heat-formed PTFE film.

■ Gasket contact surface finish

FeaturesT his gasket combines the elasticity of rubber with the corrosion resistance of PTFE, resulting in excellent sealing performance.

ゴム質ガスケット

It is ideal for PVC pipes, glass lined pipes and other applications where a large tightening force cannot be applied.
The recommended surface roughness is as follows.
Service temperature range: -40 to 150°C
・For sealing liquid：12.5μmRa max
Maximum service pressure: 1.0MPa
・For sealing gas：12.5μmRa max
Flange shape:
Full faceLine-up:	
TOMBO No.9013 EPDM coated with PTFE TOMBO No.9013-D Special EPDM for electrolytic cell coated with PTFE
■ Standard materials
NICHIASmatenal service temperature range［℃］code

Material

1050

1051

−30 ~ 120●●

9013-EP/-DEP EBILON™ gasket

TOMBOTM No.

Nitrile rubber(oil resistant)

NBR

TOMBO No.

(weather resistant)CR−30 ~ 120●●

Ethylene-propylene rubber (weather and vapor resistant)EP−40 ~ 150●

─

Butyl rubber (weather resistant, acid resistant, and vapor resistant)

IIR−30 ~ 150●

─

Silicone rubber (weather resistant and cold resistant)SI−50 ~ 200●─

(heat resistant)FA−15 ~ 200

●

─

FS

0 ~ 200●─NR−20 ~ 100●●

Chloroprene

Fluorine rubber
Fluoro rubber(corrosion resistant)FeaturesNatural rubber

Stable sealing performance can be obtained with a lower surface pressure than the rubber cut gasket.
* This gasket is recommended for mild usage conditions and low requirement for chemical resistance.

9013 シリーズ

Service temperature range: -40 to 150°C
TM
TOMBO
Maximum service pressure:
1.0MPa No.
製品情報
Flange shape:
Full face®
Line-up:		TOMBO No.9013
EPDM coated with PTFE TOMBO No.9013-D Special EPDM for electrolytic cell coated with PTFE
ガスケット
エビロン

■ Standard dimensions■ Gasket contact surface finish

・Plastic flange (equivalent to JIS 10K) 15A to 300A
・ANSI class 150 1/2 ~ 12B

The thickness of the rib part is 5mm, and the thickness
other than the rib is 3mm.

70

GAS K ET S・For sealing liquid：12.5μmRa max
・For sealing gas：12.5μmRa max* When used for steel flanges, the roughness of the gasket seat is 6.3 μmRa.

■ Product thickness

3mm

The recommended surface roughness is as follows.

5mmRubber gaskets

9014-ATOMBOTM No.

SANICLEAN™ gasket for ferrules

SANICLEAN™ gaskets for screw coupling

Semi-metallic gaskets

rubberSheet gaskets

9014-B/BW

TOMBOTM No.

rubberPTFE

PTFE

Features

Conforms to FDA (US Food and Drug Administration)*1 and USP (US Pharmacopeia)*2.

ゴ ム 質 ガ ス ケ ット

No surface deterioration due to hot water, acid, or base used during cleaning work (sanitation).

Metallic gaskets

A type of combination sanitary gasket in which the surface is made of elastic rubber and covered with PTFE film that has excellent chemical resistance, heat
resistance and contamination free.

Since there is little liquid adhesion and penetration, it can be expected to shorten the sanitization process during the flavor change*3.
Note 1: §177.1550 Perfluorocarbon Resins §177.2600 Rubber articles intended for repeat use
Note 2: <87> Biological Reactivity Tests, In Vitro <88> Biological Reactivity Tests, In Vivo (Class VI)
TM production item on a production line that shares several types of beverages, such as a product filling line.
Note 3: Flavor change:
Changing the
TOMBO
No.

9014 シリーズ

Rubber gaskets

製品情報

Max service temperature: -40 ~ 150°C

Max. service pressure: 1.0MPa

サニクリーン ガスケット®

■ Standard dimension

φA
φB
PTFE
（0.3t）

φA

φB

φC

8A

─

─

─

34.0

27.5

10.5

10A

─

─

─

34.0

27.5

14.0

15A

─

─

─

34.0

27.5

17.5

1B

32.5

29.2

23.0

49.5
（49.0）

43.5

23.1

D

5.0

φC

rubber（EPDM）φB

TOMBO No.9014-A（For screw coupling）
PTFE（0.3t）
φA

35.6

49.5
（49.2）

43.5

35.8

2B

59.5

56.2

47.8

63.0
（62.5）

56.5

48.0

2 1/ 2 B

73.0

69.9

59.5

76.5

70.5

59.7

3B

86.5

82.6

72.1

90.0

83.5

72.3

3 1/ 2 B

─

─

─

105.0

97.0

85.2

112.5

108.3

97.6

118.0

110.0

97.8

5.3

rubber（EPDM）
φC

R1.2

2.0

42.7

1.7

46.0

Pastessealing
materials
ゴandムother質ガスケ
ット

1 1/ 2 B

4B

4.8

φC

Cloth gaskets

φB

5.5

9014-B ／ BW (for ferrule)［mm］

φAD

9014-A (for screw coupling)［mm］

1.7

Nominaldimension

6.5

TOMBO No.

φB

TOMBO No.9014-B ／ BW（For ferrule）* For sizes with different standard dimensions for B type and BW type the numbers in parentheses
indicate the standard dimensions for BW type. Also, 3 1/2 B is only B type.

TOMBO No.
TM

製品情報2670 ／ 2675

GA S K E T S

71

Clothgaskets
くら べ て わ か る 織 布 ガ ス ケ ット 一 覧
A sealing material made by processing a woven fabric coated with a rubber compound to a specified shape and thickness. Depending on the
shape, there are processing methods such as cutting with a die and sewing. Since it is possible to process large diameters and the amount ofcompression under low load is large, it is used for sealing high temperature ducts that cannot take high tightening surface pressure.
TOMBO
No. for tight seal applications.
TOMBOPleaseNo. use it in a place where
TOMBO
No.
Due
to the No.
characteristics of gasket,TOMBO
it is not suitablesome leakages
can be tolerated.
TMTM

1420-ST／STOMBOTM No.

TM

1420-THTM

1400-NA

1420-ST
スーパーマンホールシリーズ 1420-S
スーパーマンホールシリーズ
TOMBOTM No.

スーパーマンホールシリーズ

Super Manhole gasket-ST

Super Manhole gasket-S

1374

TOMBOTM No.

1420-TH

マンホールガスケット

Super Manhole gasket-TH

製 品 名
TOMBOTM No.

1400-NA

Super Manhole gasket-NA

特織布ガスケット

クロスの構造長
耐熱温度1420-TH

1400-NA1374

横 糸

AES 繊維 +ステンレス鋼線

AES 繊維 +ステンレス鋼線

AES 繊維 +ステンレス鋼線

ガラス繊維 +
ステンレス鋼線

ガラス繊維

縦 糸

AES 繊維 +ステンレス鋼線

ステンレス鋼線

AES 繊維 +ステンレス鋼線

ステンレス鋼線

ガラス繊維

［℃］

800

800

600

600

400

黄白色（一部緑色）灰色

黄白色（一部緑色）

黒色

クリーム色

1420-ST

1420-S

1420-THTOMBO No.
Weft

Cloth structure

評 Warp価

硬さ･柔かさMax. service temperature圧縮量［˚C］［%］注 1

AES fiber + SUS wire AES fiber + SUS wire AES fiber + SUS wire Glass fiber + SUS wire

1420-ST

1420-SAES fiber+ SUS wire
柔らかい

SUS
硬いwire1420-THAES 柔らかいfiber + SUS wire

SUS wire
硬い

Glass fiber
柔らかい

800
60

600
65

34600

59 400

評 価

Yellowish white (partly green)弱い
20% max

Black
非常に強い
15% max

Cream
強い
25% max

たわみ量［mm］注 2

42

0

47

Heat resistance

400˚C
やや強い

600˚C
やや強い

800˚C
やや弱い

Point of selection
とても強い
強い

114
—

1400-NA
124(Deflection amount: 1mm)

82 (0mm)
1420-S

25% 以下1374 (18mm)

20% 以下—Since568
products with strong stiffness
282 do noteasily bend even with a large diameter, they
are15%
excellent
installing
以下 in handling when25%
以下 with agasket upright or when inserting into a flange※実測値であり、保証値ではありません。
that does
not open between
faces. Please
select especially when handling is important.

取 扱 性

評 価

Strong [hardness]引張強さ注 3［N］
煙 注 （有機分量）
420% 以下—

注 1：5.9MPa の面圧をかけたときの圧縮量。
注 2：サイズ20mm×200mm の試験片の 1点を固定し、自重によりたわんだ量を測定。
—
1420-TH (47mm)
1420-ST (42mm)
Weak [softness]
注 3：クロス1本当たりの引張強さ。
注 4：使用条件によって異なりますので、実機にてご評価ください。
Value
inside ( ) holds one end of a test piece with a size of 20mm x 200mm and bends due to its own weight.
測定機関：ニチアス

1Diesel engine exhaust pipe, flue manhole, boiler combustion

ラインアップTOMBO No.1374-G
TOMBO No.1374 with anti-seizure treatment (graphite treatment). Black.

Line-up

用 途

Manholes for exhaust gas, hot air, hand holes, autoclaves, large diameter flanges.

TOMBO No.1420-THG
TOMBO No.1420-TH with anti-seizure treatment (graphite treatment). Black.

TOMBO No.9094 NAFLON Manhole Gasket
A manhole gasket that uses PTFE dispersion as the filler material, and is used for ducts that require chemical
resistance and solvent resistance, and for corrosive gases such as acidic exhaust gas. Heat resistant temperature is
300 ℃. The color is white.

72

GAS K ET S

Glass fiber

1374

Gray
非常に強い
20% max

引張強さ

Application

1400-NA

1374

800
66

Smoke
emission (organic matter)
コシの強さ

発

1400-NA

Yellowish white (partly green)弱い
25% max

Color tone

Stiffness

1374

Manhole gasket

1420-S

調

TOMBO No.

TOMBOTM No.

1420-STTOMBO No.

色

アルカリアースシリケートウール（AES）製クロス または ガラスクロスをゴムで目地止めし、指定の形状に打ち抜いたガスケット。

18

Measured by: NICHIAS

織布にゴムコンパウンドを塗布し、積層･加圧したテープ状のものと、各種マンホール形状に縫い合わせ加工したガスケットがあります。

フランジの口径が大きく、歪みがあったり、高い締付面圧がとれない場合の用途に最適です。

Cloth gaskets

TOMBO No.
TM

No.
1364 1364
TM

TOMBO

TOMBO No.

TOMBO No.

1368

1378

TM

TM

NA gasket tape

NA ガスケットテープ

Sheet gaskets

This gasket tape consists of woven glass cloth coated with natural rubber and folded to form a lamNA 芯入ガスケットテープ
NA 芯入ガスケット
inated tape.

Service temperature: 400˚C
Color tone:

gray

ガラス織布に天然ゴムを塗布し、積層しNA
tadpole gasket tape
たテープ状のガスケット。
4 層巻き■TOMBO No.1368 は、
ガラス織布にゴムコンパウンドを塗布したものを渦巻状に丸め、外NA Tadpole gasket
皮で上図のように形成したテープ。

A gasket ■TOMBO
tape consistsNo.1378
of
TOMBO
No. 1378 formed
は、TOMBO No.1368 をリング加工し、ガスケッ
ト形状に縫製したも
a core of woven glass
into ring and sewn into theの。
cloth coated with rubber
shape of a gasket
compound and coiled andits outer skin is formed asshown in left figure.
400℃

低 圧 蒸 気、排 気 ガス、熱 風、などのマンホール、ハンドホール、オートクレーブ、大炉、加熱器、乾燥機などのドア部、およびダンパー、排ガス、熱風、ダストなどのマンホール。

gray

Application:

Doors such as furnaces, heaters and dryers, and manholes such as dampers, exhaust gas, hot air and dust.

Line-up:■TOMBO
No.1368-G
Anti-seizure treatment for TOMBO
No.1368(Graphite treatment). Black.

口径のフランジ。

TOMBO No.1368 に焼き付け防止処理（黒鉛処理）を行ったもの。黒色。

ラインアップColor tone:

用 途

灰色

［mm］

1420-S

1420-TH
1420-THG

14０0-NA

1374
1374-G

9094

1364

1368
1368-G

1378

─

─

●

─

─

─

─

─

─

●

─

─

─

─

─

─

─

─

3.0

─

●

─

─

─

─

─

─

─

3.2

─

─

─

●

●

●

●

●

●

4.0

─

─

●

─

─

─

─

─

─

4.8

─

─

─

●

●

●

●

─

─

5.0

●

●

─

─

─

─

─

─

─

6.0

─

●

●

─

─

─

─

─

─

6.4

─

─

─

●

●

●

●

─

─

7.5

●

─

─

─

─

─

─

─

─

8.0

─

●

●

●

●

─

─

─

─

9.6

─

─

─

●

●

─

─

─

─

10.0

●

●

●

─

─

─

─

─

─

12.5

●

─

─

─

─

─

─

─

─

【width mm】
13、20、25、30、40、50【height mm】
6.4、7.9、9.5、
11.1、12.7、
15.9、19.1、
22.2、25.4

Pleasespecify

Dimensions

Please specify【length m】30

Pastes and other sealing materials

2.0
2.5

Cloth gaskets

Nominalthickness1420-ST

Rubber gaskets■ Standard dimension
TOMBO No.

織布ガスケットの使用上の注意事項
Precautions
when using cloth gaskets
有機バインダーを使用しているため、初期の加熱に際して、有機性ガスが発生します。
初期加熱運転時には、換気を行ってください。
Since an organic binder is used, organic gas is generated during the initial heating. Ventilate during initial heating
このガスケッ
トはタイ
トなガスシールには適しません。
多少の漏れが許容される箇所にご使用ください。
Gasket with metal wires may be injured by the metal wires protruding from the end face.
Please handle it with care.
GA S K E T S

Metallic gaskets

色相

灰色

Service temperature: 400˚C

使用温度

400℃

1378

TOMBOTM No.

73

織布ガスケット

3 層巻き

Semi-metallic gaskets

1368

TOMBOTM No.

製 品 名Application:	Low pressure vapor, Manholes for exhaust gas, hot air, handholes, autoclaves, large diameter flanges

Pas teA sealing aid for gaskets. By applying a thin layer on the contact surface with the flange, it is effective in improving the sealing property and preventing seizure.

9105

TOMBOTM No.

AQUA-TIGHT™ Paste
Features:	A gasket paste suitable for water-based fluids, which is a mixture ofa special oil-soluble binder and fine powder of mica.
Application:	Water-based fluids such as water, steam, hot water, seawater, acids, alkalis, and salt solutions.
Color:

cream color

Service temperature range: -200°C ~ 200°C
Application amount: Approximately 200g/m2 (12.5m2/can)Capacity:

9106

TOMBOTM No.

2.5 kg polyethylene container

OIL-TIGHT™ Paste
Features:	Gasket paste suitable for oil-based fluids, which is a mixtureof fine powder of mica in a water-soluble binder with excellent oil resistance and solvent resistance.
Applications:	Petroleum oil, oil gas, solvent, solvent steam, animal andvegetable oil, hydrocarbon fluid, exhaust gas, etc.
Color phase:cream color

Operating temperature range: -200°C to 900°C
Application amount: Approximately 300g/m2 (8.3m2/can)Capacity:

9400

TOMBOTM No.

2.5 kg polyethylene container

NAFLON™ Paste
Features:	Room temperature inert gasket paste in which colloidal fineparticles of fluororesin are dispersed in water.
	
A versatile gasket paste that has excellent chemical resistance and can be used for acidic fluids and corrosive fluids.
* NAFLON paste is the most suitable for PTFE gaskets.

Application:	Various water-based fluids, various oil-based fluids, acidic
fluids, corrosive fluids, vacuum seals.
Color:White

Operating temperature range: ~ 260°C
Application amount: Approximately 50g/m2 (2m2/tube)
Capacity:	65cc (about 100g) containing tube, 700cc (about 1kg) containing polyethylene container

9401

TOMBOTM No.

Fluorine grease
Features:	Grease made by adding a fine powder polymer substancethat is chemically inert and has high heat resistance to fluororesin oil.
Application:

Oxygen, corrosive fluid, vacuum seal.

Color:

Milky white

Operating temperature range: ~ 150°C
Application amount: Approximately 50g/m2 (1m2/tube)
Capacity:74

GAS K ET S

50g tubePastes

Applicable paste
Indicates the standard paste to use. It may not be usable depending on conditions such as temperature and fluid.
Fluid

Product name

TOMBO No.

Suitable pastegasliquidNote 1(TOMBO No.)

1995､ 1120、1993○△

9105、9106、9400

Fluoropolymer gasket

1133、9007-LC、9007-SC

○

△

9400

GRASEAL

1834R-GR series

× Note 3

× Note 3—

NA

1834R-NA series

△

△

—

NAFLON

9090 series

△

△

—

high temperature
combination

1836R-GM、-GS、-GH series

× Note 3

× Note 3—

Metal jacketed gasket

1841、1841-FI○△

Kammprofile gasket

1891-GR× Note 3

× Note 3—

Ring joint gasket

1850C、1850V

× Note 4× Note 4—

Flat metallic gasket

1850-P○△

NAFLON, high temperature
combination)

Semi-metallic gaskets

Jointing sheetNote 2

VORTEX gasket (GRASEAL,

Sheet gaskets

GasketNeverSeez

NeverSeez
Metallic gaskets○: Recommended to use△: Optional (can be used)
×: Cannot be used

Rubber gaskets

Note 1: When carry out air tightness test in liquid fluid condition, please follow the gas condition.
Note 2: When solvent based paste is used in jointing sheet, the jointing sheet may undergone compressive breakage at below allowable seating stress. In
addition, the use of silicone based paste, it may cause the slipping of the gasket during tightening and thus compressive breakage easily occurs.
Please consult us about this usage.
Note 3: If a gasket using expanded graphite is used and a paste containing metal such as NeverSeez is used under high temperature conditions, the expanded graphite may be oxidized and disappear due to the catalytic action of the paste components. Therefore, it cannot be used.
Note 4: Since the ring joint gasket is sealed by rubbing together, the paste may become foreign matter and the sealing performance may deteriorate if it isused continuously. Therefore, it cannot be used.

Precautions for using gasket paste

Cloth gaskets

Approximate paste
application amount

Pastes and other sealing materials

 asket paste cannot be used alone. Be sure to apply it to the gasket before use.
G
Use a brush, waste cloth, etc. to spread the gasket paste thinly as shown by “○”in the figure on the right. Applying a large amount such as “x” may lead to thedestruction of the gasket. (Refer to P17 case study)
When using for the purpose of improving the gas sealability of the jointing sheet,apply gasket paste to the end face on the inner diameter side to prevent gas permeation leakage.
Set the gasket on the flange before the gasket paste has completely dried.
Stir the canned gasket paste well before use.
After use, close the lid tightly and store in a cool and dark place.
A slight fine particles of paste may elute. Do not use for fluids that do not likeeven trace amounts of elution, such as for food applications.

(TOMBO No.9400
For NAFLON paste)

GA S K E T S

75

シ ー ト ガ ス ケ ット

Other sealing materials
TOMBO No.
TM

製品情報

4140 ／ 4140-NK

Soflex ® / Soflex ® -NK processed product4140/4140-NK

TOMBOTM No.

SOFLEX™ / SOFLEX™-NK processed product● Soflex is a black foam sheet made by mixing fluoropolymer and various inorganic fillers and molding it into a sponge structure.
● Since the compression rate is very large, it fits well to the flange even with a low tightening force, and high sealing performance can be obtained.
● Excellent chemical resistance due to the use of fluoropolymer.

■ Line-up
TOMBO No.4140-NK Soflex-NK. (coated with adhesive for temporary fixing)
Since the adhesive is dot-shaped, it is easy to peel off the release paper and it has excellent workability.

■ Applications● Sealing material for gas water heaters● Sealing material for petroleum combustion equipment● Other heat insulating materials■ Standard dimension
Nominal thickness

1000×570

3.0t* Any shape can be produced by punching.

Measured value

Item

Dimension［mm］

1.0t
2.0t

■ Basic physical properties
Density[g/cm3]Tensile strength[MPa]

Compression rate [％]Thermal conductivity[W/m・K]
Max service temperature

GAS K ET S

vertical 1.1
horixontal 0.3

load 0.05N/mm 221.0load 0.10N/mm 2

34.0

200℃

0.06
[℃]

* Physical property values are actual measurement values of ourstandard products, not standard values.

76

0.40

260
Measured by: NICHIAS

Other sealing materials

9082/9082-BL

TOMBOTM No.

Applications:

Sheet gaskets

NAFLON™ Seal Tape
Water, steam, oil, chemicals, solvents, etc. Seals for bolts and nuts.
* Do not use for flammable gas or toxic gas.

Operating temperature range: -200 to 260°C* Please use as a guide as it varies depending on the usage conditions.

Standard dimensions: Thickness 0.1mm, width 13mm, length 5m/15m
It is wound on a plastic reel and put in a decorative paper case as a set	of 10 rolls.
Semi-metallic gaskets

Features

A product made by extruding unsintered PTFE with an extruder and rolling it into a tape.
Because of its high flexibility, it is easy to seal complicated shapes, it does not contaminate fluids, it is easy to put on
and take off and it has excellent workability.
* When using for threaded joints, be sure to use for tapered screws.

Line-upStandard density/cm3

Reel color

9082

1.2

green

Standard type (tight sealing)9082-BL

0.95

blue

Low density type (easier to cut and install than 9082)

1600

TOMBOTM No.

Features

Metallic gaskets

TOMBO No.

METAKOTE™
Rubber gaskets

Applications:	Hydraulic equipment, pneumatic equipment, automobile
related equipment, compressor gaskets for refrigerators,
sealing washers.

Gasket with a thin rubber coating on both sides or one side of a thin metal plate and the surface treated with graphite.

Cloth gaskets

Features

Maximum service temperature: 180 ˚CGood thickness and dimensional accuracy, no leakage.
Since stress relaxation is small, retightening is not required.

Pastes and other sealing materials

GA S K E T S

77

軟 質 ガ ス ケット

Technical data
Technical data

ガ スケットの 基 本 事 項
Gasket tightening standards and tightening methods■ Gasket tightening criteria
ボ ル テック ス ガ ス ケット®

It is very important to tighten gaskets safely using anappropriate force and tightening method.
The “Wm1” and “Wm2” which are stipulated in “JIS B8265(construction of pressure vessel -- General principles)” aregenerally used as a rough guide for the required tightening
force to seal the internal fluid.
However, depending on the type of fluid and usage conditions,these “Wm1” and “Wm2” calculated can be insufficient, therefore
NICHIAS has set an additional value “Wm3”.
When tightening the gasket, it is necessary to apply force thatis at least the largest values among “Wm1”, “Wm2”, and “Wm3”.

メ タ ル ガ ス ケット■ Concept in tightening calculation- Effective diameter and effective width of a gasket The flange has a convex shape (flange rotation) as shown indiagram due to tightening of the bolts and internal pressure.
This is taken into account in the determination of the effective
diameter and effective width of the gasket.
● Effective gasket width
The width where a gasket actually sealed

クッション ガ ス ケット● Effective gasket diameter
The diameter where an internal fluid transmitted.

Effectivewidth■ To determine the effective gasket widthand effective gasket diameter● First, consider the basic width (b0) of the gasket.
The basic width of the gasket depends on the shape of the gasket
seat. However, it is generally half the gasket contact width.

b0＝gasket contct width / 2● Effective gasket width (b)Using the basic width of the gasket as a guide, calculate by
the following formula.

In the case of b0≦6.35 b=b0
In the case of b0＞6.35 b=2.52 √b0● Effective gasket diameter (G)Using the basic width of the gasket as a guide,
calculate by the following formula.

In the case of b0≦6.35
Ｇ＝Average diameter ofgasket contact surface
In the case of b0＞6.35
Ｇ＝O.D of gasket contact
surface−2b

Effective width

Effective
diameterG

contact width■ What are Wm1, Wm2 and Wm3?
● Wm1 is the necessary minimum tightening force[N] to prevent the flange from opening underpressure.it is calculated by the following formula.

Ｗｍ１＝ Ｈ ＋ Ｈｐ
H: Force which tends to open the flange due to internal pressureThis force is called end force (internal pressure reaction).

ゴ ム 質 ガ ス ケットπ
H ＝ ─ G2 P
4
Hp: Force required to seal the internal fluid pressure P
Effective diameter

Effectivewidth

Hp ＝ 2πbG mP
Hp is m (gasket factor) times the internal pressure P withrespect to the effective area of the gasket. Normally, thevalue is usually doubled in order to provide a safety margin.

πGP
Ｗｍ１ ＝ Ｈ ＋ Ｈｐ = ─（G + 8bm）
4
● Wm2 is the required bolt load [N] when tightening the gasket.
It is calculated by the following formula.

Ｗｍ2 ＝ πbGy
巻 末 付 録● Since Wm1 and Wm2 are calculated regardless of the type of fluid(gas, liquid), the tightening force may be insufficient with thesevalues. The minimum bolt load [N] set by NICHIAS to compensate
for this is Wm3, which is calculated by the following formula.

78

Ｗｍ3 ＝ σ3 A g

GAS K ET S

Ｐ ＝ Internal pressure [MPa]ｂ ＝ Effective gasket width [mm]Ｇ ＝ Effective gasket diameter [mm]ｍ ＝ Gasket factor [−] (Ratio of minimum effective tightening pressure without leakage and internal pressure)ｙ ＝ Minimum design seating stress [N/mm2]
σ3 ＝ Minimum seating stress [N/mm2]
Ag ＝ Gasket contact area [mm2]軟 質 ガ ス ケット

Technical data

■ Gasket seating stress

Leakage due to small
insufficient tightening

big
seating stress

Max value of Wm1,
Wm2 and Wm3

Damafe due toover-tightening

Fig. 1 Diagonal tightening
procedure

Allowable seating stress

The tightening torque of the bolts is calculated from the
maximum value [Wmax] of Wm1, Wm2 and Wm3.

Wmin

T ＝─ K ─ Dn1000
T = Bolt tightening torque [N･m]
K = Torque coefficient [—] (normally 0.20)
n = Number of bolts [—]D = Bolt diameter [mm]“Diagonal tightening” is widely adopted as the bolt tightening
method in which bolts in diagonal positions are tightened inorder. In 2008, JIS B 2251 established tightening method forjointing sheet and flange joint for spiral wound gasket. The
method is described in below.

<Temporary tightening>
If the number of bolts on the flange is 8 or less, temporarily
tighten them according to the following procedure. If thenumber of bolts is 12 or more, select the bolts to be
temporarily tightened according to Table 1 and tighten them inthe same way.

4

5

6

3
2

7

bolt selection criteria
Number of flange bolts

selection criterion

12 or more, less than 24

4 bolts equally spaced at 90°

More than 24

Two sets of four bolts 90 degrees apart andevenly spaced, and four bolts 45 degrees apartfrom the set of bolts (8 in total)<Final tightening>(1) If the number of flange bolts is 4, tighten diagonally with atightening torque of 100% of the target tightening torque.
(2) If the number of flange bolts is 8 or more, tighten them inclockwise based on the Table below.
Nominal flange diameter Number of turns〜 250A
250A 以上

8

4 turns
6 turnsFig. 2 clockwisetightening procedure

1

7

2

6

3
5

ゴ ム 質 ガ ス ケット<Introduction>
Install gasket correctly centered on the gasket seat to ensure it
is not tightened unevenly.Use a torque wrench to control thetightening torque.

®

クッション ガ ス ケット■ JIS B 2251-2008
Bolt tightening for pressure boundary
flanged joint assembly1

メ タ ル ガ ス ケット■ Calculation of tightening torque1

8

ボ ル テック ス ガ ス ケット

The tightening force of the gasket should be the value
calculated from the largest of “Wm1, Wm2, Wm3”. However, inorder to prevent compression breakage, it must be less than
the allowable seating stress
Tighten within this range* For VORTEX gaskets, at the end of temporary tightening, tighten
all bolts in clockwise direction at 50% of the target tightening
torque (to prevent one-sided tightening).
* Target tightening torque setting
8 or less bolts: 100% of the specified tightening torque12 or more bolts: 110% of the specified tightening torque4<Tightening>
If retightening is required, wait at least 4 hours after the end of
final tightening, and then tighten 1 to 2 times using the sameprocedure for final tightening.

巻 末 付 録(1) As shown in Fig. 1, tighten the diagonal bolts in order.
(2) Increase the tightening torque step by step (for example,
10% g 20% g 60% g 100% of the target tightening
torque) and tighten evenly.
(3) Measure the gaps between the flange surfaces diagonally atfour points with a caliper, etc., and check if they aretightened on one side.

GA S K E T S

79Technical data
Technical data

Flange type

JIS flange and JPI flange

Flange shape

Flange commonly used in Japan includes JIS flange and

JIS B 2220 “Steel Pipe Flange” classifies by the shape of

JPI flange.

the flange as shown in the table below.

JIS flanges are specified in JIS B 2220 “Steel pipe flang-

The A and B types of slip-on welded hub flanges (SOH)es”, JIS B2239 “Cast iron pipe flanges”, etc., and JPI

have larger inner diameters than the C type and butt

flanges are made by the Japan Petroleum Institute (JPI)

welded flanges of SOH.

and the American Society of Mechanical Engineers

Therefore, when using VORTEX gaskets for SOH A-type(ASME). It is stipulated in the JPI standard created soand B-type flanges with nominal pressures of 20K andthat the flange standard can be used in Japan.

30K, the dimensions of the gaskets will be different, so

JIS flanges are used in many industries such as building

be sure to specify the type when ordering.

equipment piping, and JPI flanges are widely used in the

In addition, SOH A-type and B-type flanges are prone topetroleum refining industry and are also the mainstream

compression failure, so be careful of tightening control

in overseas.

when using NAFLON PTFE enveloped gaskets.

JIS flanges and JPI flanges differ in pressure class classification, flange seat dimensions, bolt specifications andthe gasket dimensions also differ, therefore please specify
the standard when ordering.

 ifferences in specifications between
D
JIS flanges and JPI flanges
Flange nomi- Gasket contact area
nal diameter
(mm2)
A

B

JIS
10K

JPI
class
150

JIS
10K

JPI
class
150

15

1/2

1663

576

4×12

4×1/2

20

3/4

1847

830

4×12

4×1/2

25

1

2564

1119

4×16

4×1/2

50

2

4316

3740

4×16

4×5/8

80

3

6107

6306

8×16

4×5/8

100

4

7521

8840

8×16

8×5/8

150

6

13395

14178

8×20

8×3/4

200

8

16588

19200

12×20

8×3/4

250

10

25192

22950

12×22

12×3/4

300

12

25434

30540

16×22

12×3/4

350

14

32742

33175

16×22

12×1

400

16

45180

42680

16×24

16×1

GAS K ET S

Flange type

Shape

Slip-on welding
type Plate flange
(SOP)

—

Bolt specificationsNote 1(Number x size)

Note 1: JIS flange uses Metric bolt, JPI flange uese UNC bolt.

80

Flange typeA

Slip-on welded hubflange (SOH)

B

C

Socket welded
flange (SW)—

Butt welded flange(WN)—

Lap Joint flange(LJ)—

Threaded flange(TR)—

Integrated flange(IT)—

Blind flange (BL)—

FigureTechnical data

Type of gasket seat

Precautions when using a lap joint flange

Types of gasket seats include raised face, full seats, male

The loose flange (lap joint) is a type of flange in which aand female seats, tongue seats and group seats and ringstub end with a brim is inserted into the end and thejoint seats.

brimless side of the stub end is butt welded to the pipe

A ring-shaped gasket (F.R .: Flat Ring) is used for theend.

raised face seat (R.F .: Raised Face) with the gasket seat

The loose flange is widely used because the flange andfinished in a convex circular shape, and rubber is used

the pipe are not fixed and can rotate freely, so it is easy

for the flat face seat (F.F .: Flat Face) with the entire flange

to install, and because the flange material can beflat face finished. For rubber gaskets, full-face gaskets

changed to the pipe, it is also economical.

are used, and for sheet-based gaskets and coated

However, since there is a clearance between the flange

gaskets, ring-shaped gaskets are used.

and the outer diameter of the pipe, the center of the

It is possible to use a full-face gasket for the raised facegasket shifts and contacts one side, and the gasket

flange, but if a full-face gasket is used for the flat facesurface pressure tends to be uneven. Especially forflange, or if a spiral-wound gasket is used, please beflanges with flare processing, the angle of of the flange

cautious of insufficient tightening force or poor installationand the R processing of the inner diameter differ depend-

may occur. It is also possible to use a ring gasket for theing on the flange manufacturer, and the contact width

flat face flange, but in this case, the values of the mini-

between the gasket and the flange may become signifi-

mum tightening torque and the allowable tightening

cantly smaller.

torque are different from the values of the technical data,

For this reason, we generally recommend sheet gaskets

so calculate from the gasket tightening area.

for lap joint flanges, but this is not the case if the flange

In addition to this, there is also a type of gasket that has

manufacturer specifies a gasket.

a ring-shaped gasket with hangers for easy insertion into

In addition, compression failure is likely to occur, so

the flange.

appropriate torque management is required.

Types of flange seats and loose flanges
Raised face
(R.F.)

Flat face(F.F.)

Stub end

Brim processing
welding
welding
welding
welding
welding
welding
lap
lap
joint
lap
lapjoint
joint
joint
lap
joint
lap
joint
flangeflangeflangeflangeflangeflange

lap
lap
joint
lap
joint
lapjoint
joint
lap
joint
lap
joint
flangeflangeflangeflangeflangeflangebrim
brim
processing
brim
brimprocessing
processing
processing
brimprocessing
brimprocessing

Gasket shape
Flat ring gasket(F.R.)

Full-face gasket(F.F.)

With hangers

GA S K E T S

81

Metallic gasket

Technical data

General gasket selection guidelines(1) Carbon steel flange (Raised face / flat face)(4) Resin-coated steel pipe flange

General-purpose jointing sheets (TOMBO No.1995) areGeneral-purpose jointing sheets (TOMBONo.1995) arecommon and have a proven usage record for applications

common and have a proven usage record for applica-

below 100°C.

tions below 100°C.

For steam / hot water applications of 100°C or higher,

For parts where cleanliness is required, select various

use heat-resistant jointing sheets, fluoropolymer

fluoropolymer gaskets in consideration of performancegaskets, and VORTEX gaskets according to the condi-

and economy. Tighten the NAFLON PTFE envelope

tions.

gasket with the allowable tightening torque or less.
VORTEX gaskets cannot be used as they may dam-

(2) Carbon steel flange (flare processing)age the resin.

Since misalignment and one-sided contact are likely tooccur, sheet gaskets are generally selected.

(5) Resin flange

However, the flare processing flange manufacturer may

EBILON gaskets with ribs and NAFLON PTFE enve-

specify the gasket based on testings and actual

lope gaskets are recommended because it is often not

performance verification . In this case, use the gasket.

possible to apply high seating stress.

Since the NAFLON PTFE envelope gasket is easily

PTFE-coated products are recommended for areas

compressed and broken, when using it for a stub end

with high chloride ion concentration and temperature.

flange, follow the instructions of the flange manufacturer and perform appropriate tightening management.

(6) Exhaust pipe, flue flange(3) Stainless steel flange
For electrical insulation applications, use the most82

Select a manhole gasket that meets the temperature
conditions.

suitable electrical insulation gaskets and bolts accord-Other gaskets are not recommended as they often do

ing to the temperature and pressure conditions.

not meet the required seating stress.

GAS K ET S

List of standard dimensions of gasket■ Jointing sheets
TOMBO No.

１S (1270×1270mm)

1120

1995

1995-W

1993

1991-NF

0.4 t

●

─

─

─

●

0.5 t

●

─

●

●

●

0.8 t

●

●

●

●

●

1.0 t

●

●

●

●

●

1.5 t

●

●

●

●

●

2.0 t

●

●

●

●

─

3.0 t

●

●

●

●

─

●

─

─

─

●

0.5 t

●

─

●

●

●

0.8 t

●

●

●

●

●

1.0 t

●

●

●

●

●

1.5 t

●

●

●

●

●

製 品 情 報 ふっ 素 樹 脂 ガ
0.4 スケットt
３S (1270×3810mm)■ 設計基準TOMBO No.

ふっ素 樹 脂 ガスケット

ガスケット
係数 m [─]

1133

1.0 t

3.50

1.5 t

2.75

2.0 t

2.75

６S (2540×3810mm) 3.0 t

2.00

1.0 t

2.00

1.5 t

25.5

2.0 t

25.5

3.0 t

11.0

水･油系流体14.7

最小設計
締付圧力 y[N/mm2]

９S (3810×3810mm)
最小締付面圧σ [N/mm ]

2.0
t
1155
3.0 t
─
0.8t
2.75
1.0 t
2.75
1.5 t
2.00
2.0 t
2.00
3.0 t
22.5
0.8 t
22.5
1.0 t
11.0
1.5 t
2.014.7
t
3.0 t
34.3

ガス系流体

34.3
Thickness 1.5t 1S size Weight per sheet
150.0
許容締付面圧 [N/mm2]
3

2

150.0

●
9007-SC● 9007-LC 9007-G20

9007

3.50

3.50

─
3.20
3.00
2.50
─
22.5
19.6
19.6
14.7

●

●
●
●
●
●
─
─
─
─

●
3.50
●
3.20
●
3.00
●
2.50
●
24.5
●
22.5
─
19.6
─
19.6
●
12.7
●
24.5●注1

3.20
3.00
2.50
24.5
22.5
19.6
19.6
14.7

29.4 ─ 24.5
3.63
58.8
49.0

●
●
9007-ST
9096-SGM 9007-GL
9007-ML ─9007-LP
●
─
─
3.20
●
3.00
●
2.50
●
─
●
22.5
─
19.6
─
19.6
─
10.8
─
注1
19.6
─

3.20
3.00
2.50
24.5
22.5
19.6
19.6
10.8
19.6 注1

注2
19.6
4.35
49.0

14.7 注2

2.50
2.50
2.50
2.50
19.6
19.6
19.6
19.6
19.6
39.2

注2
14.7
4.35
39.2

39.2

117.6 注3

●
─
─
─
─
─
─
2.50
─
─
─
─
─
─
─
19.6
─
14.7
─

─
14.7
4.23
39.2

─

─

─

─

3.20

─

─

─

3.00

─

2.50

─

─

─

─

─

22.5

─

─

─

19.6

─

19.6

─

─

10.8

14.7

─
19.6 注1 ─

19.6
14.7 注2 3.75

29.4

39.2

* Standard dimensions are shown as above. * It may be possible to manufacture even the dimensions are not stated in above Table. Please contact us for the availability.
注１：厚み1.0t、1.5t の最小締付面圧。
注 2：厚み2.0t、
3.0t の最小締付面圧。 注 3：2.0t、3.0t の許容締付面圧は78.4N/mm2。

gaskets■ Fluoropolymer
標準寸法
TOMBO No.
1.0 t
1.5 t

Maximum outer
diameter [mm]

2.0 t

1133

1155

9007-SC

φ610

─

─

φ1250

φ1250

φ1200

φ1200
φ1250
φ1430
製 品 情 報 3.0
膨t 張 黒鉛ガ スケット

Standard thickness

9007-LC 9007-G20

─
φ1200

φ1200

φ1200

─
─

φ930
─

φ277

φ1380

φ600

φ930

─

φ1200

φ1430

─

φ1380

●

─

─

●

●

●

─

●

─

─

─

1.5 t

●

●

●

●

●

●

●

●

─

●

─

●

●

●

●

●

●

●

●

─

─

●

●

●

●

●

●

●

●

●

●

●

─

3.0 t

1200
TOMBO
No.can be made larger by welding.
Dimensions indicatedin yellow[─] by welding.
Dimensions indicatedin green can be made larger
ガスケット係数m2.00

最小設計締付圧力 y1215-ATOMBO No.
Skin shape
［mm］
さ
3

2.00

2.00

2.00

29.4

29.4

26.0

14.7

14.7

注1

49.0

9007
49.0

膨張黒鉛ガスケット

ガス系流体
A/KA/RA
type
1.5
1.5
0.8 t
2.24 φ152.06
1.6 t
24
11

1.5

14.7

B/KB/RB
1.5 type1.5

1.5

170.0

2.30

106.0
18

2.21
φ300
21

294.0
2.18

167.0
34

Note 1
Note 1[mm]
arbitrary
Maximumouter diameter
3.2
t
79.0
98.0
9
8
5
4
6φ10005［%］
圧
縮率34.3MPa
60
53
55
67
46
47
［%］
復
元
率
規格寸法品では所定の締付面圧が加わりにくい場合がありますのでご注意ください。
注1：
Note 1: please contact us for maximum outer diameter of welded product.

100℃ × 22h56
23
27
は 1.5t の許容締付面圧を示します。
注 2：TOMBO No.1210-A
200℃ × 22h

59■ GRASEAL™
標準寸法
gaskets■

41

79

9007-ST 9096-SGM
39.29007-LP
49.0 9007-GL 9007-ML

AS/KS/RS1.5
type
1.5

2.17
35

Minimum width [mm]1813166.0

9

69

39

69

62

78

Note 1

73

57

43

62

59

65

─

─

67

87

─

─

測定機関：ニチアス

─

0.05

─

166.0 2822

98.0
14 φ70018

─

0.4, 0.8, 1.6, 3.2
0.8, 1.6, 3.0
ふっ素樹脂製品の注意事項● ガスケット座の仕上げ

2.0

2.18

67

1215-A
1215-AT

diameter [mm]

─

74

1200

Maximumouter■
設計・選定に関する注意事項
φ985

1.5

2.18

50

Nominal thickness [mm]Reinforcing plate thickness [mm]

3.0

294.0
1.83
1.94
φ20
167.0 注 2 22141

※ 上記の値は実測値であり、規格値ではありません。

TOMBO No.

1880-GR

26.0

2

2.74
［─］ [mm]比重
Maximum
inner diameter[N/mm2]
許容締付面圧18［N/mm2］
引張強さ

1210-A[N/mm2]■ 基本物性
水･油系流体NAFLON™
envelope
gaskets14.7■最小締付面圧[N/mm]
σ PTFE
1133
1155
9007-SC 9007-LC 9007-G20

応力緩和率 ［%］9007-ST 9096-SGM 9007-GL 9007-ML 9007-LP

1.0 t■ 設計基準 2.0 t

厚

9007

φ1480 Note 1
51210-A

1880-GR

1.5, 2.0, 3.0

1.6, 3.2

0.10

0.8

■ 使用上の注意事項
φ1480● 使用できない流体─

φ3300 Note 2
12.8

ガスケット座は JIS B 2220-2012の旋削仕上げとし、推奨表
・ PTFEのガスケットには、
溶融アルカリ金属、
高温のふっ素、
Note 1: Gasket with nominal thickness of 0.8mm can be manufactured to a maximum diameter of 985mm.
面粗さは次のとおりです。
三ふっ化塩素など PTFEを侵す流体には使用しないでくNote
2: Please consult us for dimensions more than 3300mm.
・ 液体シールの場合：6.3μm Ra 以下
ださい。
［グラシールテープ］
GA S K E T S
・ ガスシールの場合：3.2μm Ra 以下
TOMBO No.

1220

● モノマー流体の場合
1221

83

List of standard dimensions of gasket■ VORTEX™
標準寸法 gaskets
Gasket thickness [mm] Note 1

Inner and outer ring thickness [mm]Recommended I.D Note 2 [mm]carbon steel

Other than carbon steel

Min.

Max.

3.2

2.0

2.0

φ16

φ600

4.5 (standard)

3.2

3.0

φ16

φ3000

6.4

4.5

4.0

φ1500

φ3000

Note 1: When using as a gasket for pipe flanges, the gasket thickness should be 4.5mm as general rule.VORTEX Gasket-NM thickness line-up is only 4.5mm.
Note 2: We can manufacture products with dimensions other than those listed, but please contact us as it may be deformed, warped, or breakage, or it may take longer than usual
as a special specification.
Also, please note that the inner ring cannot be attached if the inner diameter of the main body is the smallest.kage, or it may take longer than usual as a special specification.

Kammprofile gaskets
2.3

Gasket thickness [mm]Manufacturable range

5.0

Inner diameter10 ~ 690.0

20.1 ~ 3980.0

outer diameter

20 ~ 700.0

30.1 ~ 4000.0

Standard

Body width

4.0—

Manufacturable
range

10, 13, 15, 20
outer diameter φ 30.1 ~ φ 50.0 : 5 ~ 15
outer diameter φ 50.1 ~ φ 100.0 : 8 ~ 20
outer diameter φ100.1 ~ φ4000.0 : 10 ~ 30

10 ~ 20

Standard metal main body material

304 stainless steel, 316L stainless steelStandard hanger material

304 stainless steel

Construction Note 1

basic, with hangers type, with ribs type and with outer ring type

Note 1: Kammprofile gaskets cannot be manufactured with “bolt holes for flat faces” or “irregular shapes (track-shaped, oval, erc)”

jacketed gaskets■ Metal
標準寸法
Metal jacketed material

carbon steel

304 stainless steel 316 stainless steel 310S stainless steel

Tube cross[mm]
Coppersection diameter

AluminumMaterial symbol

S

E

G

V

A

Standard dimension [mm]

1480

1180

1180

1180

980

Wa

C
φ0.8
1180

*Indicates the maximum diameter that can be manufactured with a single metal plate. For diameter larger than this, we will weld it with two or more metal plates
together.
φ1.6

Metal O Seals

φ2.4

Tube cross section diameter [mm] Wal thickness [mm]
φ0.8

0.15

φ1.6
φ2.4

6 〜 300.25

─12 〜 200

0.36

15 〜 50

11 〜 200

0.25

─

40 〜 500

0.46

40 〜 200

20 〜 500

0.25

─

60 〜 1270

─

60 〜 1270

65 〜 700

40 〜 1270

0.5 注1

─

150 〜 1500

0.8

500 〜 1200

150 〜 1500

0.81000 〜 1500

250 〜 1500 注2

0.5

φ4.8
φ6.4

Rubber cut gaskets
thickness [mm]width [mm] Maximum O.D [mm]

1.0
1.5
2.0
3.0

1000

φ1000

5.0
10.0
* The minimum thickness of 1051-NR gasket is 15mm

84

GAS K ET S

Recommended service range Manufacturable dimensions
6 〜 250.35 注1

φ3.2

O.D dimension [mm]Note 1: The only tube material that can be manufactured is 321 steel.
Note 2: Please contact us if diameter exceeds 1500mm.
*
Indicates the standard wall thickness. For gas
seals,
φ3.2
please use standard wall thickness.
The minimum O.D of a vent hole type is 10mm.
**
The maximum outer diameter of PTFE coating is
φ630, Please contact us for more information.
φ4.8
and the maximum outer diameter of silver plating is
φ1300.
φ6.4

Minimum value of corner R in the case of
Note 1: The tube material that can be manufa
a square gasket

Note 2: Please contact us if it exceeds 1500m

For standard wall thickness
area)
* (
Indicates
standard wall thickness. For g* O.DThe
minimum
radius of I.D side ≥ 6 times theof thetube outer diameter of the ven*

The maximum outer diameter of PTFE c

contact us for more information.
For thickness less than standardPleasewall thickness
radius of I.D side ≥ 8 times the O.D of the tube

EBILON™ gaskets
Plastic flange (JIS 10K equivalent) 15A-300A
ANSI class 150 1/2 ~ 12B

Rubber O rings
JIS B 2401 “O-ring”
AS 568B “Aerospace size standards for O -ring”
JIS B 8365 “Dimensions of clamped-type vacuum couplings”

Gasket design criteria list
Jointing sheets
TOMBO No.

1120

Gasket factor m [—]Minimum design seating stress y [N/mm2]
Minimum seating stress σ3 [N/mm ]
2

1995

0.8 t

3.50

1.5 t

2.75

3.0 t

2.00

0.8 t

44.8

1.5 t

25.5

3.0 t

11.0

Water oil type fluid

14.7

gas type fluid

34.3Note 1

0.8 t

without paste

Allowable

1993

294.2

1.5 t

196.1

3.0 t

seating stress

98.0

Note 1: We do not recommend athickness of 3.0t for gasbased fluids.
Note 2: 58.8N/mm2 when used with
anticorrosion paste.

147.1

0.8 t

[N/mm2]

with paste

68.6Note 2

1.5 t
3.0 t

Fluoropolymer
Design criteriagaskets
TOMBO No.
Gasket factorm [─]Min. design
seating stress y[N/mm2]

1133

1155

9007-SC

9007-LC

9007-G20

9007

9007-ST

9096-SGM

9007-GL

1.0 t

3.50

─

─

3.50

3.50

3.50

─

2.50

9007-ML

9007-LP

1.5 t

2.75

2.75

3.20

3.20

3.20

3.20

3.20

2.50

─

─

─

─

3.20

2.0 t

2.75

2.75

3.00

3.00

3.00

3.00

3.00

─

2.50

─

─

3.00

3.0 t

2.00

2.00

2.50

2.50

2.50

2.50

1.0 t

44.8

─

─

24.5

24.5

24.5

2.50

2.50

2.50

2.50

─

─

19.6

─

─

1.5 t

25.5

25.5

22.5

22.5

22.5

─

22.5

22.5

19.6

─

22.5

2.0 t

25.5

25.5

19.6

19.6

19.6

─

19.6

19.6

19.6

─

─

19.6

3.0 t

11.0

11.0

19.6

19.6

19.6

19.6

19.6

19.6

19.6

19.6

─

Water.oil type fluids

14.7

14.7

14.7

14.7

12.7

10.8

10.8

19.6

14.7

10.8

14.7

σ [N/mm ]Gas type fluids

34.3

34.3

29.4

24.5

24.5 Note 1

19.6 Note 1

19.6 Note 1

Note 2

Note 2

Note 2

39.2

14.7

Allowable seating stress[N/mm2]

150.0

150.0

58.8

49.0

117.6 Note 3

39.2

Min. seating stress
2

3

19.6
49.0

14.7

14.7

39.2

39.2

19.6 Note 1

19.6

14.7Note 2

29.4

39.2

Note: 1 Minimum seating stress for a thickness of 1.0t or 1.5t.
Note: 2 Minimum seating stress for a thickness of 2.0t or 3.0t.
Note: 3 The allowable seating stress for a thickness of 2.0t or 3.0t is 78.4N/mm2.

NAFLON™
PTFE envelope gaskets
Standard dimensions
ShapeNo.
symbol
TOMBO

1133

1155A / AS
9007-SC/ KA / 9007-LC
KS / RA 9007-G20/ RS Type 9007

1.0 t

φ610

─

─

1.5 t

φ1250

φ1250

φ1200

3.0 t

φ1430

6、8
9
φ1200
(jointingwith felt)φ1430(TOMBO No.1120+SUS mesn)
φ1250 sheet

1.0 t

●

─

1.5 t

●

●

2
[N/mm
● ]

●

●

●

Maximum
O.D
Core material［mm］
symbol

2.0 t

Gasket factor mMin. designStandard
thicknessseating stress y 2.0 t

3、4、5、7(jointing sheet)

[—]

3.0 t

Min. seating stress Water.oil type fluid

2

φ1200(TOMBO No.1880-GR)
φ1200
φ1200

─

●

●

●

14.7 ●

●

●

●

3.50

9.8

9007-ST

─ 3、4、5、7

●
3.50
●
●19.6

●

─

●

●

●

●

●
14.7

●

●

24.5 (39.2)

Note 1: The values in parentheses are TOMBO No.1120 + stainless steel net type values.
1133
1155
9007-SC 9007-LC 9007-G20
TOMBO No.

tensile strength
Compressibility［%］

─

19.6

19.6

29.4

24.5

1.5

2.0

2.06

2.30

2.21

2.18

2.17

1.83

1.94

2.18

2.18

18

21

34

35

141

22

22

5

8

9

14

18

18

13

67

26.0
55

53

29.4
60

69

3929.469

62 26.078

23type fluids 56
Water.oil
41
Note 1 79
Gas type fluids

50
14.7

67

73
14.7

57

4314.762

59 14.7

65

74

─

─

─

67

87

─

─

6

[—]

46[N/mm ]2

244

膨張黒鉛ガスケッThe above values are actual measurements, not standard
values.
0.8 t[N/mm2]

1.6 t

1200
2.00

49.0
170.0
106.0

1215-A
2.00

49.0

9096-SGM 9007-GL

294.0
167.0

Precautions for fluoropolymer products
3.2 t

79.0

98.0

Note 1: Please note that it may be difficult to apply the specified seating stress with standard size products.
Note 2: TOMBO No.1210-A indicates the allowable seating stress of 1.5t.

Precautions concerning design and selection■ Standard dimensions
Gasket contact surface finish

1210-A
2.00

49.0

294.0
167.0

Note 298.0

Precautions for use

Unusable fluid

9007-ML●

3.0

5

Allowable seating stress

●
14.7

1.5

11

27

●

1.5

18

59

●

14.7

─

9007-ST［N/mm2］200℃ × 22h

─

─

1.5

2.24

100℃ × 22h

19.6●

─
4.00
●
─19.6

9007

Minimum［%］design seating stress
47 y
Recovery[N/mm2]

─

1.5

2.74

Minimumseating stress σ3
Stressrelaxation ratio ［%］

─

●

1.5

［─］

34.3MPa

●

4.00

1.5

TOMBO No.

Gasket factor m

─

φ9302

1.5

Design criteria■Thickness
GRASEAL™
gaskets
1.5［mm］
Specific gravity

─

φ1200 6、8
(TOMBO─No.1880-GR)
φ277
φ1380
(jointing sheetwith felt)φ600
φ930
─

Note 1

Physical properties

9007-LP─(jointingφ1380
sheet)* The3 yellow
part in the figure can be manufactured with a larger diameter than indicated by welding.
2
14.7
19.6
Gas type fluid
[N/mm
* The
green] part in the figure can be manufactured with a larger diameter than the indicated by adhesive.

Allowableseating2
製品情報 膨 張[N/mm
黒 鉛ガ
29.4
] スケットstress9096-SGM
9007-GL
9007-MLB / KB/ RB Type

9007-LP

1880-GR
2.00

39.2

28
9

Measured by:— NICHIAS
166.0
166.0

GA S K E T S

85

Gasket design criteria list
Kammprofile gaskets
TOMBO No.

1891-GR

Gasket factor m

1891-TF[─]

Min. design seating stress yMin. seating stress σ3[N/mm2]1891-NM

セミ メタルガ スケット

Note 1

2.25

3.00

2

[N/mm ]

15.2

44.8Note 1

water oil type fluids

29.4

34.3

gas type fluid

39.2

78.4

2

450

450

Allowable seating stress

Note 1[N/mm ]

Note 1: The applicable range is the standard flange and the design flange of the existing equipment. For new flange design, design criteria for spiral woundgaskets is as follows. (m = 3.00, y = 68.9 [N/mm2]).

Design criteria™ gaskets
VORTEX
temperature
1804-GR■ Maximum
TOMBOservice
No. Note 1
Gasket factor m[—]Filler material
temperate [℃][N/mm2]
Min. design seating stress yMillboard for high temperature
Expandedgraphite
Min seatingstress[N/mm2]800

316 stainless steel

800

39.2
coppergas type fluid

78.4

400

Aluminum

34.3

800

─

34.3

class 150 29.4
39.2

78.4

78.4

class 300 39.2
class 600 49.01150 294.2

Alloy 400

Note 1: Indicates the basic type of TOMBO No.

29.4

400

310S stainless steel[N/mm2]58.8

535

304 29.4
stainless steel 34.3

Allowable seating stress

3.00

carbon steel

400

1809
1809AL

68.9

temperate [℃]water. oil type fluids
1300

1808-NM

3.00

Jacketed material

530

1806-GS-GM,-GH

9090

294.2
* Please check the heat resistance of both filler
material
and the jacketed material metal when using.

®

jacketed
Designcriteria gaskets■ Metal1861-C

1861-A

When setting the vortex dimensions individually,sure that the gasket body width is at least304therecommended
minimum width
304 stainlessmake
steelstainlesssteel
copperAluminum
carbon steel 316 stainless steel others
copperAluminum
carbon steel 316 stainless steel others
Jacketedshown
in thematerial
figure below.
[—]

25 seatingMin.
stress σ3[N/mm2]

3.25

3.00

3.50

3.25

2.50

38.0

31.0

44.8

38.0

20.0

34.3

29.4

—

—

—

—

76.2

58.8

—

3.75

3.75

3.50

[N/mm2]

52.4

62.1

44.8

water/oiltype fluid

39.2

49.0

Gas type
fluid

101.4

120.4

Min. design seating stress y

Maximum width of the main body [mm]メタルジャケットガスケット

1841-E
1861-E
gasket thickness
1841-S
1841-C (When1841-A
1861-Sis 4.5mm)
TOMBO No.
Recommended
widthofgasket body1841-G others
1861-G others30
Gasketfactor m

Recommended width

Recommended minimum width———for NA VORTEX and VORTEX-GM,-GS, -GH, -NM

20
Plain
type metallic gaskets

TOMBO™ No.

Material[─]

15Standard
dimension■Gasket[─]coefficient mMin.
10 seating stress σ3
material symbol

1850-P-S

1850-P-E, P-G, others

Carbon steel

304 stainless steel, 316 stainless steel, others

5.50

coebon[N/mm2] steel

JacketedmaterialMin.
design seatingstress y

Water-type andS
oil-type fluids[N/mm2]standard
dimension Gas-type 1480
fluids[mm]

Recommended minimum width for

1850-P-C
1850-P-A
GRASEAL VORTEX andNAFLONVORTEX
Copper6.50

304
stainless steel
124.2

316 stainless
steel
179.3

Aluminum

4.75

4.00

310S stainless steel89.6 Aluminum

copper
60.7

98.1 E

G117.7

V

58.8

A

39.2C

235.4
1180

343.2
1180

1180

98.1

980

78.5
1180

※ 1 枚ものの金属板で製作できる最大径を示します。
これより大きい場合は、
2 カ所以上を溶接して製作します。

Serrated
metallic gaskets
5
TOMBO™ No.

1890-C1890-A1890-S

1890-E, 1890-G, others

Carbon steel
304 stainless steel, 316 stainless steel, others
Precautions [─]for metal
jacketedgasket Copper
[─]
3.75
4.25
3.50

AluminumMaterial

0Gasketcoefficient m
16

100

200

Min. design seating stress y

300 2

400

[N/mm ]

500

52.4

600

700

800

69.6

900

1000

44.8

1100

3.25
1200

1300

38.0

[mm]
body inner
selection
Precautions
for use■diameter■ Precautions conceming design and Main
Ring joint
gaskets· When used for gas-based fluids, use with GRASEAL
contact
surface finish● GasketStandard
dimensions

1400(expanded graphite) tape or gasket paste (NEVERSEEZ
The recommended surface roughness according to JIS
1850-C-E, 1850-C-G
TOMBO™ No.
1850-C-D, 1850-V-D
1850-C-S, 1850-V-S
1850-C-F, 1850-V-F
Nickel Special
Grade:Recommended
Operating temperature:
1850-V-E,-183-1316°C,
1850-V-G,bodyothersmanufacturable
B2220-2012 is as follows.
[mm]
inner
and
outer
ring
thickness
Note 2 [mm]1
inner diameterStainless
Gasket thickness [mm]Note[─]etc.).
Pure
iron
Mild
steel
F5
steel
Material· For sealing liquid : 3.2μmRa max·GasketFor sealing
gasm: 1.6μmRa max[─]coefficient
3.2

seating stressy [N/mm
For designtemperature
is 400°C
or ]less● Min.

86

ボルテックス ガスケット

Millboard

1804-NA2

4.5 (standard)

Carbon steel
5.50
2.0
124.2
3.2

Since
GAS
K ET S the sealing surface of the metal jacket gasket is

6.4 TOMBO No.1891 (Kammprofile4.5
metal, we recommend
gasket), which has good compatibility with the flange andNote 1: Vortex Gasket-NM thickness lineup is only 4.5mm.

Other than carbon steel

Min.
6.00
2.0
· When using for a grooved φ16
150.3
flange,3.0
the folded side of the
φ16

gasket shall be installed
4.0
φ1500
facing inside the groove.

Max.
6.50
φ600
179.3
φ3000
φ3000

INDEX
Product number(TOMBO™ No.)

Product namePage

Product number(TOMBO™ No.)

Product namePage1050/1051

Rubber cut gasket

68

1993

CLINSIL™ Super

19

1120

CLINSILTM Top

18

1995

CLINSIL™ Brown

18

1133

CLINSILTM Clean

23

1995-W

CLINSILTM White

18

1155

CLINSILTM Next

22

2670/2675

Rubber O-ring / BLAZRTM O-ring

69

1200

GRASEALTM gasket

34

4140/4140-NK

SOFLEXTM / SOFLEXTM-NK processed product76

1210-AGRASEALTM gasket MI-A

34

9007

NAFLONTM PTFE cut gasket

241215-AGRASEALTM gasket PM-A

34

9007-G20

NAFLONTM glass fiber filled PTFE cut gasket

24

1220/1221

GRASEAL™ Gasket Tape
(Plane / Crinkle)

35

9007-GL

NAFLONTM GL cut gasket

25

1364

NA gasket tape73

9007-LCNAFLONTM PTFE low creep cut gasket

23

1368

NA tadpole gasket tape73

9007-LP

NAFLONTM LP gasket

25

1374

Manhole gasket

72

9007-MLNAFLONTM ML cut gasket

25

1378

NA tadpole gasket

73

9007-SC

NAFLONTM special carbon filler filled PTFE cut gasket

23

1400-NA

Super Manhole gasket-NA

729007-ST

NAFLONTM ST cut gasket

241420-S

Super Manhole gasket-S

72

9010

NAFLONTM PTFE envelope gasket

28

1420-ST

Super Manhole gasket-ST

729013/9013-D

EBILONTM gasket

70

1420-TH

Super Manhole gasket-TH

72

9013-EP/-DEP

EBILONTM gasket

70

1600

METAKOTE™

77

9014-ASANICLEANTM gasket for screw coupling

71

1834R-GR series

GRASEALTM VORTEXTM gasket

39

9014-B/BW

SANICLEANTM gasket for ferrules

71

1834R-NA series

NA VORTEXTM gasket

39

9082/9082-BL

NAFLONTM Seal Tape

77

1836R-GS/-GM/-GH
seriesVORTEXTM gasket-GS / -GM / -GH

40

9090-IOR series

NAFLONTM VORTEXTM gasket

41

1838R-NM series

VORTEXTM gasket -NM

40

9096 series

NICHIAS SOFTSEALTM

32

1839RAL series

GRASEALTM VORTEXTM gasket-AL

419096-EZL

EZLTM gasket

27

1839R series

NAFLONTM VORTEXTM gasket

41

9096-SGM

SGMTM gasket

241841 series

Metal jacketed gasket

549096-TRI

TriGuardTM gasket

27

1850C

Octagonal ring joint gasket

60

9105

AQUA-TIGHTTM Paste

74

1850P

Plain metallic gasket

62

9106

OIL-TIGHTTM Paste

74

1850V

Oval ring joint gasket

60

9200P

Standard Metal O seal

65

1861 series

Corrugated metal jacketed gasket

54

9200V

Vent hole type Metal O seal

65

1880-GRCMGC gasket

35

9400

NAFLONTM paste

74

1890

Serrated metallic gasket

62

9401

Fluorine grease74

1891-GR

Kammprofile gasket

52—

Irregular shape VORTEXTM gasket

42

1891-NM

Kammprofile gasket

51—

Gasket for heat exchangers

56

1891-TF

Kammprofile gasket

52

1991-NF

CLINSILTM NF

19

GA S K E T S

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88

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