Summer 2021
No.41

● Valqua Technology News Greetings ・・1
Director & CTO

Mutsuo Aoki

● Customer Solutions

Precautions when considering usage
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and troubleshooting（FlectorTM）● Customer Solutions

Launch of the BLISTANCETM
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● Product Introductions

Report on Predictive Maintenance Technology
for Equipment by Vibration Measurement
Introduction of Network-based Predictive

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Maintenance System・● Product Introductions

Mat Sensor Using Piezoelectric Sheet・
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https://www.valqua.co.jp● Product Introductions

Heat Resistant Acrylic Rubber L6070・
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Elastomer for High Concentration Chemicals
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・27
and Ozone ARCURYTM Series・● Recent Technology News Back Issues・・・30

Valqua Technology News
Greetings
We thank you for regularly reading the Valqua Technology News.
We have now entered the middle of 2021, but the global spread of COVID-19 that has been continuingsince last year is still with us. Advances in vaccination and other measures have meant that we are
now seeing signs of progress towards a return to normal, but we must still remain vigilant. On theother hand, even in such a difficult situation, it is necessary for society as a whole to be able torespond appropriately to changes in the international situation and to environment-related issues. I
assume that readers are also making various efforts to steer a new direction in this completely
different "New Normal" business environment.

Summer 2021

Our company has designated this year as the first year of our corporate transformation（CX）and weare implementing a number of initiatives aimed at achieving the targets we have set forth. This
includes the growth targets in our three-year medium-term management plan“New Frontier 2022”（NF 2022）, which was launched last year, and the major targets we have set for 2027, which will be
the 100th anniversary of our company. The goal of these activities is to evolve into an H&S company
that not only provides hardware, but also delivers services to the customers which provide added
value. This is something we started from the time of NV・S7, the mid-term business plan before last.
Furthermore, in the CX activities in NF2022, we are incorporating leading-edge technologies fromJapan and overseas as we promote activities to advance our company’s traditional seal engineeringand peripheral technologies into next-generation technologies. The aim of this is for the service
technology products incorporating digital solutions that our company offers to trigger innovative
No.41 digital transformation（DX）in total business with our customers. I also hope that the development
results generated by these activities will make a significant contribution to labor-saving in operations,as this is an area where the coronavirus crisis has triggered accelerating needs in all industries.
Another major challenge facing industry around the world is initiatives to suppress climate change,
which are expressed by terms such as carbon neutrality and the circular economy. For this problem,
our company is also working to appropriately fulfill our responsibility as part of the industrial world.
We are striving to reflect these challenges in the contents of our R&D activities, so that they are also
results that should be created by our technology development activities. The promotion of suchactivities is consistent with our company’s endorsement of TCFD, which has already been widelyreported in the media. We expect that the results of these activities will enhance our company’s ESG
value and lead to business results that satisfy our stakeholders.
Against this background, in this issue of Technology News, the main topics examined are themes
introducing products such as highly distinctive high performance seal products that are expected to
become increasingly important in specific fields in the future, systematization products that are
expected to be deployed in predictive maintenance technologies utilizing IoT, and seals that are
expected to bring significant benefits to facilities related to hydrogen, which is attracting increasing
attention as a new energy material.
I thank you in advance for your continuing support of the products and services of our company, as
well as for reading the Valqua Technology News.
Director & CTO
1

Mutsuo Aoki

Customer Solutions

Precautions when considering usage
and troubleshooting（FlectorTM）
1. Introduction
Expansion joints, a type of pipe joint, have been widelyused in various plants since the past. An expansion
joint is a component that absorbs the effects of mutual
displacement between structures, and is indispensablefor the safe operation of various plants. Therefore, it is
crucial to carefully select them, because installing andoperating an incorrectly designed product can lead to
There are metallic and non-metallic expansion joints.

Figure1

Summer 2021

equipment damage and possibly a major accident.
Photograph of external view of No.FLEXThe non-metallic expansion joint manufactured by ourcompany is called FlectorTM.
This report provides a brief product overview of FlectorTM,
precautions to be taken when considering its usage, as
well as usage troubles and their countermeasures.

No.41

2. Product overview
2-1）No.FLEX（Flex）
This product is a combination of metallic parts（flanges,etc.）and a non-metallic cover（Figure1）.The cover partis made of integrally molded rubber and reinforcing

Figure2

Photograph of section view of No.XP-221

Figure3

Photograph of external view of No.PRBT

fabric, therefore eliminating any joints and providing
excellent airtightness, long-term flexibility, andradiation resistance.
Major applications: Ventilation equipment in nuclear
power plants.
2-2）No.XP-221
This product is a combination of a cover and metallic
parts（flanges, etc.）formed by sewing and bondingorganic and inorganic cloth, film, etc.（Figure2）. It is
used in a wide range of industries due to its high2Precautions when considering usage and troubleshooting（FlectorTM）

degree of freedom in design and high versatility.

have a significant impact on the performance andMajor applications: Exhaust gas, boiler and dust

longevity of the product and therefore caution iscollector lines in various plants, etc.

required. In this section, the reasons why this isnecessary will be explained in detail for each item.

2-3）No.PRBT（Rubber boots）
This product is made of the same cover material as3-1）Nominal dimensions（Mounting dimensions）

No.FLEX, and is installed by wrapping a fan-shaped

It is critical that the mounting dimensions are correct,

cover with fasteners sewn on both ends around theotherwise the product cannot be installed. Therepipe penetration area, closing the fasteners, sealing themight occur a problem of discrepancy between thearea with an amorphous sealing material, and thendrawings and the actual site due to lack of management

fixing both ends with metallic bands（Figure3）. Thisof revision and abolition. Therefore, it is important toproduct is specially designed to seal the gap between

confirm the current status.

the pipe at the pipe penetration area and to absorb
pipe displacement.

3-2）Installation location and fluids

Major applications: Pipe penetrations in walls and floors

If installed outdoors, it is necessary to implementof power plants.

appropriate measures because the surrounding
environment is harsher than indoors, including rain,

Summer 2021

3. P
 recautions when considering
usage

ultraviolet rays, and temperature differences. As for fluids,

Figure4 shows a product specification sheet. The items

inner cylinder will be necessary, and this is important

colored in pink are the minimum necessary information.

because it has a significant impact on longevity.

the presence or absence of corrosiveness and dust willlead to determining whether a cover configuration or

If there is insufficient or incorrect information, it will3-3）D esign conditions, flow velocity, flow rate,

No.41

and distance between mounting surfaces

Valqua Flector Specifications
Date

Temperature and pressure are important criteria for

Sales Office
Name of Contact Person

Dealers
Customer Name

Quantity

Sales channels

Yes - No /Date of previous use
Usage Examples（Required for export）(Previously use o/#)Inclusion of venues

Nominal sizeamount of displacement and the space between the

Purpose of use
Name of facility or equipment
Installation point

Installation Location

Indoor / Outdoor

Dust: Yes (amount) ・ No

(Ingredients)
Temperature(°C)
Pressure(kPa)

Corrosiveness: Yes ・ No
In operation

Temperature(°C)
Pressure(kPa)

Axis direction(X)
Axis vertical
Displacement(Y)
Axis level(Z)

Flow rate
Flow direction

Materials

Horizontal/vertical (top to bottom, bottom to top) Other

Flange (non-contact gas part)

Inner tube (gas contacting part)

Bolts for mounting

GasketRestricted materials

Other

Middle coat
Top Coat
Finish color

Other matters3

The cross-section of the design may change dependingon the flow direction and mounting position. Since theflow direction will also be printed on the product, it isnecessary to provide this information.

Undercoat

Figure4

combination.
3-4）Flow direction and mounting position

Mounting length

Pretreatment

Coating

mounting surfaces, there is a possibility that one or theother cannot be addressed depending on the

Fluid name

Design conditions

checking both design parameters and operating
conditions. Since there exists a correlation between the

If there are specific dimensions, please indicate them separately on the drawing.

Terms ofUsecover selection. Optimum design can be achieved by

Product specification sheet

Customer Solutions

4. E
 xamples of troubles andtheir countermeasures

XP-221 with the inner cylinder during shutdown. Since
it was installed perpendicular to the ground, powder
accumulated between the cover and the inner cylinder

Examples of troubles due to insufficient information,

during shutdown. This happened because there was no

incorrectinstallation, etc. will be outlined, as mentioned

information about the mounting direction and negative

above.

pressure. If powder accumulates between the cover andinner cylinder, it will affect the absorption of
set bolt

displacement of the cover, and the powder will scrape
against the cover during displacement, leading todamage to the cover.

bracketCountermeasures include filling the gap between the
inner cylinder and the cover with heat insulating
material or installing both inner cylinders in order toeliminate the gap where fluid can enter.

Figure5 Half-sectional view of XP-221 equipped with a set bolt

In operation

After stopping4-1）Omitting removal of set bolts

Protection Sheet

maintain the structure of the product during

Cover
Inner canistertransportation and storage. Although instructions are
given to remove the set bolts when the product isinstalled, it may happen that the product is operated

Fall by gravity

FlangeFlow direction

bolt is shown in Figure5. Set bolts are installed toGasketFlangewithout removing them. Since the primary role ofexpansion joints is to absorb displacement throughexpansion and contraction, it is pointless to leave the

Figure6

No.41

Image of the XP-221 with inner cylinder during
shutdown

rigid set bolts in place.
Occasionally, mounting is done with the bolts slightly
loosened, but the maximum displacement cannot be

Summer 2021

A half-sectional view of the XP-221 equipped with a set4-3）Installation of thermal insulation on theoutside of the productabsorbed with the set bolts in place, so they must be

Although we do not recommend the application ofremoved after the product is installed.

thermal insulation to the product, there have been

In principle, we make sure that the removal of the set

cases where it was wrapped around the expansion

bolts is clearly indicated on the delivery drawings

joint as well, in order to maintain thermal efficiency ofprovided by our company.

the equipment. Figure7 shows a half-sectional view of
the XP-221 equipped with thermal insulation. When4-2）D ust accumulation problem due toinsulation is applied, heat from the fluid is trappedinsufficient information regarding

without hardly being dissipated to the outside air.

mounting position

Wrapping insulation around can lead to a loss ofNormally, if there is no specific instruction, the productelasticity and heat-induced deterioration of the cover,is designed to be installed parallel to the ground. In thiseventually damaging the product. If thermal efficiency

example, the design included an inner cylinder because

is a priority, shortened product lifetime and damage

the fluid was powder. Figure6 shows an image of themust be considered in advance.
4Precautions when considering usage and troubleshooting（FlectorTM）

As a countermeasure, considering outside installation,
CR tarpaulin, which has good weather resistance, was

5. Precautions for usage

selected as the most outmost layer, but since its heat

As mentioned above, it is possible to design theresistance is low, in this case, we applied a cover madeproduct if the pink sections in Figure4 are provided.

of heat-resistant inorganic cloth and PTFE film.

However, since troubles such as those mentioned above

Temperature
25℃

Heat insulator

may occur due to insufficient information, it isimportant that we proactively confirm and obtain
detailed information from our customers. Even so,
installation problems are more common than otherproducts, and since the installation is done by thecustomer, particular attention should be paid to thefollowing:

Fluid
Duct
temperature
300℃

Cover

Thermal insulation

Figure7 H
 alf-sectional view of XP-221
equipped with thermal insulation4-4）M alfunction due to insufficient information
on current condition of installed equipment

Summer 2021
No.41

1）S
 et bolts are to be removed after the product is installed.
2）I f the product is equipped with an inner cylinder,
consider the flow direction, and do not reverse theinstallation.
3）D o not wrap with thermal insulation.

There has been a case where, due to long-term use of
the equipment, earthquakes, and aging, there were
deviations between the information in the

6. Conclusion

documentation when the equipment was first installed

The FlectorTM introduced in this report is a productand the current situation, leading to mounting defects

directly related to the safe and secure operation of aand damage after operation. In addition, sometimes theplant, so it is necessary to design the product carefully.

distance between the surfaces becomes longer, or the

In order to do so, sufficient information is indispensable,

bolt positions are shifted by several degrees. Since suchand we intend to make use of our long years ofdeviations are not taken into account in the design,

knowledge to proactively conduct extensive hearings

there are high chances that the equipment will be

and propose solutions.

damaged after operation even if it can be installed, andthus it is crucial to verify the current conditions.

Takanori Sakamoto
H&S Sales Div.
Technical Solutions Group
Technical Paper
5※ "Flector" is a trademark of VALQUA, LTD.

Customer Solutions

Launch of the BLISTANCETM
blister resistant material series
1. Introduction

mechanism, and introduce our new product line,"BLISTANCETM" series, which is resistant to blisters.

O-rings and other elastomer seal materials（hereinafterreferred to as "seal materials"）are considered to haveexisted since the second half of the 19th century to the

2. Blisters2）
This section describes the mechanism leading to theoccurrence of blisters, a type of degradation in seal

mankind over the past 100 years by preventing liquids

materials.

and gases from leaking from joints and other

Blisters occur under certain conditions, when sealconnections of pipes used in a wide range of industries

material such as O-rings in equipment and devices are

such as automobile, aircraft, chemical and steel.

exposed to sudden pressure fluctuations while in

The development of the aforementioned industries has

contact with gases and fluids such as volatile liquids

been extremely rapid, and the environments to which

under high temperature and high pressure.

seal materials are exposed are also becoming moreFirstly, from a microscopic point of view, elastomers

severe and complex in the process.

are composed of intertwined molecular chains and are

When the elements of environmental complexification

relatively porous materials. Therefore, in high-that was previously mentioned are broken down, theytemperature and high-pressure environments, gases

can be broken down into two, energetic factors andand volatile liquids can easily penetrate the interior of1）

environmental factors . Energetic factors include heat,

the seal material through the gaps in the molecularstress, light, and radiation, while environmental factors

chains, and some of which remain inside.

include air, water, acids, alkalis, oils, and fluids such as

Furthermore, when the pressure is rapidly reduced

organic solvents.

from the state where the fluid is retained inside theWhen seals are used in an environment where suchseal material, the gas or volatile liquid expands infactors are intertwined, their characteristics gradually

volume inside the seal material and tries to escapechange and their mechanical strength and chemicaloutside from the surface of the seal material.

properties deteriorate compared to the initial state, orWhen the above phenomenon occurs or reoccurs

there is a change in appearance. Such phenomena are

multiple times, the force of the fluid trying to escape

generally referred to as degradation, and as degradation

overcomes the mechanical strength of the seal material,

progresses, seals no longer prevent fluids from leaking

causing foaming and cracking inside and on the surface

and eventually reach the end of their service life.

（Figure1）.

As mentioned above, degradation is caused by a

In industries dealing with elastomers, this type of

combination of various factors, and there are many types

degradation, where fluids trapped inside physicallyof degradation. In this paper, we will focus on a type ofdamage the seal material upon depressurization, isdegradation called blisters, explain its formation

called "blister"（Figure2）.
6

Summer 2021

first half of the 20th century. They are one of thecomponents that have supported the development of

No.41

Launch of the BLISTANCETM blister resistant material series② Select a seal material that has low compatibility
with fluids.
③ Decrease the cross-sectional diameter of the sealmaterial to reduce the amount of fluid retention
inside.
Figure1

Schematic diagram of blister formation mechanism

In addition, adjustments to the operating environment,such as lowering the operating temperature andslowing down the decompression rate, are considered
to be effective in preventing blister formation.

3. P
 roduct overview of the"BLISTANCETM" series

Summer 2021
No.41

Figure2 Example of an O-ring where blisters have occurred

Using ① and ② in the previous section 2 as criteria, weWhen blisters occur, the corresponding area may"BLISTANCE TM", including both newly developed

become a leak path, or fracture due to pressure applied

products as well as previously available blister-resistantto the fissure, making the seal material unable toseals, to make it easier for customers concerned about or

have launched a new series of products called

perform its function of preventing fluid leakage.

troubled by blisters forming in high-pressure hydrogen

For instance, high-pressure hydrogen gas environments

gas, high-temperature steam, refrigerant + refrigerant oil,are an area where damage can be caused due toand other environments, to select seal materials.

blisters. If a leak occurs due to blister generation of the

In this section, we will introduce the features of each ofseal material, the static electricity generated in thethe following four products:

surroundings may cause an explosion, which may leadto a severe accident involving human lives.
Moreover, a prime example of volatile fluids are
refrigerants（CFC or CFC substitutes）, which are also akind of fluid where the occurrence of blisters issometimes seen. In recent years, R134a and other CFC
a l t e r na t i v e s h a v e bec o m e t h e m o s t c o m m o nrefrigerants, and unlike the specified CFCs used in the

1．"BLISTANCETM- H Series", suitable for use in hydrogengas environments.
2．"BLISTANCETM- St Series", suitable for use in hightemperature steam environments.
3．"BLISTANCETM- Rf Series", for use in refrigerant +refrigerant oil environments.
4．"BLISTANCETM- Mu Series", for use in a wide range ofother environments.

past, they do not deplete the ozone layer. However,their global warming potential is not significantly

3-1）BLISTANCETM-H series

different, and their impact on global warming is

The BLISTANCETM-H series is a seal material suitableconsidered to be significant in case of leakage.

for use in hydrogen gas environments. Currently,

In order to prevent the leakage caused by these

BLISTANCETM-HST for low pressure（under 2MPa）,

blisters, it is important to select the most suitable seal

BLISTANCE TM-HMP for medium pressure（undermaterial for that environment. Some of the criteria are

35MPa）, and BLISTANCE TM-HLT series for highdescribed below:

pressure（under 95MPa）are available, all three of
which are made of EPDM seal material.

① Select a seal material with high hardness andmechanical strength.
7

The maximum pressure of hydrogen gas used atcurrent hydrogen stations is 82MPa, and its mechanism

Customer Solutions

is as follows: from a container called a "curdle," throughtest was conducted at the Hydrogen Energy Products

a compressor and a pressure accumulator, cooled by a

Research and Testing Center（HyTReC））.

pre-cooler, and then filled into a vehicle through a

We have run a similar test on general-purpose seals

dispenser. Since the filling of hydrogen gas from theand the difference in appearance after the test isdispenser into the vehicle is done by using differential

apparent（Figure4）.

pressure, the compression by the compressor affects
the filling speed. The higher the pressure to increase
the filling speed, the greater the heat generated byadiabatic compression during filling.
Therefore, when hydrogen gas is filled at room
temperature, there is a risk of exceeding the heat
resistance temperature of the hydrogen tank inside the

Figure4

 urface condition of O-ring after high-pressureShydrogen cycle test

vehicle（said to be 85℃ for Type IV hydrogen tanks
made of CFRP）, so it is necessary to cool the hydrogen

BLISTANCETM-HLT also has excellent low-temperature

gas to -40℃ using a pre-cooler（Figure3）.

properties. The following is a comparison of lowtemperature properties between BLISTANCETM-HLT
and a general-purpose seal material also made of
EPDM. The low-temperature properties were evaluatedFigure3 Mechanism of a hydrogen station, schematic diagram

In this case, the situation where blisters are most likely（hereinafter referred to as TR test）in accordance withJIS K6261- 4. The results are shown below（Figure5,
Table1）.

to form is when a sudden decompression from 82 MPa

Summer 2021

by conducting a low temperature elastic recovery test

to atmospheric pressure occurs while the temperature
has risen to around 85℃ and the chances are

No.41

particularly high with general-purpose seal materials. In
addition, the same seal material must be able to seal ata pressure of 82 MPa and temperature of -40℃.
Also, hydrogen gas is handled at pressures of 35 MPain small hydrogen stations and 2 MPa in hydrogen gas
detection sensors, and since these facilities are notequipped with pre-coolers, the presence or absence of
low temperature characteristics is not questioned here.
In introducing the BLISTANCETM-H series, we will first
introduce the features of BLISTANCETM-HLT, which is

Figure5 easurement results of BLISTANCETM-HLT TR test
M
（Comparison: General-purpose EPDM）

Table1 Comparison of BLISTANCETM-HLT and H0970 TR values
BLISTANCETM–HLT

Conventianal EPDM
H0970

TR10（℃）-51-43

TR30（℃）-47-30

depressurization of hydrogen gas at a pressure of 90

TR50（℃）-44-21

MPa at 90℃, no leakage of hydrogen gas was detected

TR70（℃）-39-13

Shrinkageat minus 40℃
（%）

67.4

12.8

most suitable for seals used in areas exposed to highpressure and low temperature3）.
The most remarkable feature of BLISTANCETM-HLT isthat even after 11,250 cycles of rapid pressurization andduring the cycle test and no trace of blisters was foundon the seal material after the test.（The pressure cycle8Launch of the BLISTANCETM blister resistant material series

The above graph shows that the temperature moves

depressurization, resulting in blister formation.

toward room temperature as the horizontal axis moves

Seal materials that are used in food and beverageto the right, and the seal material regains its elasticity

manufacturing facilities are actually exposed to suchas the vertical axis moves downward. From this result,conditions, and blister formation can become a problem.

it can be confirmed that general-purpose EPDM

The product that we would like to recommend forregains 10% of its elasticity at around -43℃, whereas

customers who are facing the above problems is

TM

BLISTANCE -HLT regains the same level of elasticity

BLISTANCE TM-StHT 4）. This product is based on

at around -51℃, showing that it has excellent low-tetrafluoroethylene-propylene rubber（FEPM）, and has

temperature properties.

a different molecular structure from conventional

The fact that no leakage of hydrogen gas was detectedbinary FKMs consisting of vinylidene fluoride（VDF）

after 1,000 cycles of 90 MPa pressurization at -40℃ andand hexafluoropropylene（HFP）（Table2）.

another 20 cycles of 90 MPa pressurization at -50℃ at
HyTReC, indicates that BLISTANCETM-HLT is suitable
as a seal material for use in low-temperature and highpressure hydrogen gas environments.
As mentioned above, BLISTANCETM-HLT is a product

Table2

Molecular structures of FEPM and binary FKM

Type

Molecular Structures

FEPM

that displays its performance in a high-pressurehydrogen gas environment that can be exposed to low

Summer 2021

temperatures, but it is over-specified for use in a
medium-pressure hydrogen gas environment where thetemperature is not as low and the pressure is less thanThe most significant feature of BLISTANCETM-StHT,

35 MPa or in a low-pressure hydrogen gas environment

which wa s developed wit h our compounding

where the pressure is less than 2 MPa. For thesetechnology using FEPM as base material, is that the

TM

No.41

FKM
（Bipolymer）

applications, we recommend BLISTANCE -HMP for

value of the compression set rate is lower than that of

medium-pressure hydrogen gas or BLISTANCETM-HST

the conventional FEPM-based seal materials even in afor low-pressure hydrogen gas.

steam environment of 230℃, and that blisters do not

Finally, please refer to VALQUA Technology News
No.39（2020）for the details of BLISTANCE

TM

-HLT

characteristics and tests.

occur during decompression due to its improved
mechanical strength.
Although EPDM and HNBR-based seal materials havebeen widely used in the past in steam environments of3-2）BLISTANCE -St series

less than 150℃, BLISTANCETM-StHT seals demonstrate

BLISTANCE TM-St series is a blister-resistant seal

significantly higher capabilities than conventionalTMmaterial for high-temperature and high-pressure steam

materials at temperatures above 150℃, where sealing

environments, and there is only one type of BLISTANCETM-

used to be difficult.

StHT in the current range.

The following is a photograph of a compression set test

In general, seal materials made of binary fluororubber

specimen that was actually exposed to a steam（FKM）are used in high temperature environments

environment at 230℃ for 72 hours in a compressed

under air, but it is known that when the environment

state and then rapidly decompressed, as well as the

becomes steam, hydrolysis occurs and the mechanicalmeasured compression set strain rate after exposure tostrength decreases.

a steam environment at 200℃ for 72 hours（Figure6,

In addition, there have been cases where, when used

Table3）.

under high pressure, steam penetrated and stayed
inside the seal material, which expanded upon9

Customer Solutions

from liquid to gas and vice versa. Hence, the occurrenceof blisters is also seen regarding seal materials inapplications where refrigerants are used.
The most important condition for selecting a sealmaterial in a refrigerant environment is that it should
Figure6 C ross-section of test specimen after 72h ofcompression in 230℃ steam

have high mechanical strength to withstand blister

Table3 C omparison of compression set rate between
BLISTANCETM-StHT and conventional FEPM

important that it has low affinity for refrigerants andcompression set rate（％）
200℃×72h
Under steam

formation caused by pressure changes, but it is also

BLISTANCETM–StHT

conventional FEPM

1836

refrigerant oils used as lubricants, in order to reduce
the amount of fluid penetration into the seal material.
BLISTANCETM-RfST, introduced in this section, is a
HNBR-based seal material with high mechanicalstrength and low affinity for refrigerants andTM

refrigerant oils（mineral and synthetic oils）.

StHT does not show blister formation even in

The following photographs show samples removed

environments where it has occurred in conventionalfrom a pressure vessel after depressurization when

FEPM, and furthermore, the compression set rate in

our conventional HNBR and BLISTANCETM-RfST weresteam environment is small and thus favorable.

placed into a pressure vessel filled with refrigerant

In addition, as shown in the beginning of this section,and refrigerant oil, and kept at elevated temperature

FEPM has good acid and alkali resistance. Therefore,

and internal pressure for 72h.（Figure7）.

BLISTANCETM-StHT can be expected to have a longservice life not only in steam but also in acidic andalkaline vapor environments. Thus, customers who

Summer 2021

From the above results, it can be seen that BLISTANCE -have concerns or difficulties about blisters in steam
environments or leakage of acidic and alkaline fluids inhigh-temperature environments are recommended toNo.41

consider using BLISTANCETM-StHT.

Figure7 C omparison of test specimen surfaces
after refrigerant immersion test3-3）BLISTANCETM-Rf series

Blisters occurred on our conventional HNBR, but were

BLISTANCE TM-Rf series is a blister-resistant seal

not observed on BLISTANCETM-RfST exposed to amaterial for use in environments where a refrigerant isrefrigerant environment under the same conditions.

mixed with refrigerant oil, and there is only one

From this example, it can be said that BLISTANCETM-

produce, BLISTANCETMRfST, in the current series.

RfST is suitable for use in a refrigerant environment.

In general, refrigerants（fluorocarbons including CFC

In case the main component of the refrigerant oil is aalternatives）are used as fluids in areas where heat

synthetic oil such as polyalkylene glycol, we would

exchange takes place. Heat exchange is achieved

also like to recommend the BLISTANCETM-H series, inthrough the process of removing heat from theparticular, BLISTANCETM-HMP, as described in 3-1）.

surrounding environment by vaporization heat as wellas its release during liquefaction. The refrigerant3-4）BLISTANCETM-Mu Serieschanges to a liquid when pressurized, and becomes a

BLISTANCETM-Mu series is not a blister-resistant sealgas when the pressure is lowered. Therefore, during

material for specific environments such as high-pressure

heat exchange, the pressure is frequently changed,hydrogen gas, high-temperature steam, and refrigerant

requiring the refrigerant to change its state each timeenvironments introduced so far, but all possess high10

Launch of the BLISTANCETM blister resistant material seriesmechanical strength, and therefore, if there is no

product with hardness 95, and BLISTANCETM-MuHT,

compatibility problem with the used fluid, they can bea FKM-based product with hardness 90.

considered as products that prevent blister formation.

In order to use the most suitable seal material in any

Currently, we offer three types of products:

given environment, when blister formation is a

BLISTANCETM-MuST, a HNBR-based product withhardness 70, BLISTANCETM-MuHP, a HNBR-based

concern, please consider the BLISTANCETM-H, St, andRf series as well.

4. ‌Environmental compatibility and basic physical properties of the
BLISTANCETM series
As a summary, Table4 and 5 show the environmental compatibility and basic physical properties of the BLISTANCETM
series introduced in this paper.
Table4 List of BLISTANCE™ Series Environmental Compatibility
Main Applications

High-pressure hydrogen gas environment

High-pressure
steam
environment

Refrigerant
environment

Series name

BLISTANCETM H Series

BLISTANCETM
St Series

BLISTANCETM
Rf Series

Product name

BLISTANCETM Mu Series

BLISTANCE -HST BLISTANCE -HMP BLISTANCE -HLT BLISTANCE -StHT BLISTANCE -RfST BLISTANCE -MuST BLISTANCETM-MuHP BLISTANCETM-MuHT
TM

TM

TM

TM

TM

TM

EPDM

EPDM

EPDM

FEPM

HNBR

HNBR

HNBR

FKM

70

80

90

90

80/85

70

95

90

Service temperature（℃）*Highest and lowest℃）

Refrigerant※hydrogenMaterial
Nominal Hardness（HA）

Application Suitability

Summer 2021
No.41

Other Environments-40 ～ 120

-40 ～ 130

-50 ～ 100

0 ～ 200-20 ～ 120

-20 ～ 120

-15 ～ 120

-30 ～ 200

High pressure（〜 95MPa）

×

×

◎

×

×

×

×

×

Medium pressure（〜 35MPa）

〇

◎

◎

◎

〇

〇

◎

◎

Low pressure（〜 2MPa）

◎

◎

◎

◎

〇

◎

◎

◎

Steam

〇

◎

△

◎

〇

〇

〇

△

Natural gas

×

×

×

〇

◎

〇

◎

◎

Mineral oil as
refrigeration machine oil

×

×

×

×

◎

〇

◎

×

Synthetic oil as
refrigeration machine oil

◎

◎

◎

×

〇

△

〇

×

※ R134a, R245fa, R32, R400 series, R1234 series and other refrigerants are applicable

Table5 List of BLISTANCE™ Series Basic Physical Properties
Main Applications

High-pressure hydrogen gas environment
BLISTANCETM H Series

Series nameProduct name

Refrigerant
environment

Other Environments

BLISTANCE
Rf Series

BLISTANCETM Mu Series

TM

BLISTANCETM-HST BLISTANCETM-HMP BLISTANCETM-HLT BLISTANCETM-StHT BLISTANCETM-RfST BLISTANCETM-MuST BLISTANCETM-MuHP BLISTANCETM-MuHT

Material
Hardness

High-pressure
steam
environment
BLISTANCETM
St SeriesーNormalTensile MPa
physicalproperties strength
JIS K6251 Elongation ％（JIS No.3
dumbbell） 100% Tensile MPa
StressHardnessーHeat aging test change
JIS K 6257 Tensile strength ％（JIS No.3
changedumbbell） Elongation％
changeCompression set test
JIS K 6262 Compression ％（φ29.5 × 12.5t） Set Rate

EPDM

EPDM

EPDM

FEPM

HNBR

HNBR

HNBR

75

80

93

90

80

73

94

FKM
92

17.1

22.4

14.3

26.9

21.9

30.6

28.8

22.7

200

180

110

120

185

240

90

110

6.4

9.4

10.4

23.0

10.1

7.9

ー

20.0

±0 ※ 4＋1 ※ 4＋2 ※ 4±0 ※ 6＋3 ※ 5＋3 ※ 5＋1 ※ 5±0 ※ 4＋5 ※ 4-4 ※ 4＋4 ※ 4-1 ※ 6＋8 ※ 5＋8 ※ 5＋4 ※ 5-3 ※ 4＋15 ※ 4-4 ※ 4-9 ※ 4±0 ※ 6-4 ※ 5-11 ※ 5-14 ※ 5-3 ※ 412 ※ 57※516 ※ 420 ※ 614 ※-13 ※ 519 ※ 59※4※ Both environmental compatibility and basic physical properties are for reference only and are not guaranteed data.

11

Customer Solutions

5. Acknowledgments

7. References

We would like to express our sincere gratitude to the1）‌H. Nakauchi, Concept of Degradation and Lifetime ofpeople at the Development Office of Ihara Science

Elastomers, Material Life 6［3］, 113-124,（1994）

Corporation for their cooperation since the very

2）‌H. Zushi, Causes and Solutions of Blister Trouble

beginning in the development and evaluation of

Caused by High Pressure Gas and High Volatile

BLISTANCETM-HLT, in particular, among the

BLISTANCETM series.

Liquid, VALQUA Technology News No.31, 17-21,（2016）
3）‌R. Nishihara, Seal Material for High Pressure

6. Conclusion
In this article, we have introduced the BLISTANCETM
series as blister-resistant seal materials, and there is a

Hydrogen Gas, VALQUA Technology News No.39,
16-20,（2020）4）‌H. Zushi, Long Life FEPM TOUGHUORO, VALQUA
Technology News No.36, 25-28,（2019）

background that they were seal material with highmechanical strength. Therefore, we hope that the
BLISTANCE

TM

series will be widely used even in※ ‌"BLISTANCE" is a trademark of VALQUA, LTD.
※“TOUGHUORO" is a trademark of VALQUA, LTD.

environments where blister formation is not expected.
In addition to the expansion of the BLISTANCETM

Summer 2021

series, we will continue to work hard on thedevelopment of new elastomer materials and theimprovement of existing materials so that we canquickly respond to the needs of our customers.

No.41
Ryohei Nishihara
Elastomer Team,
Product Development Div.,R&D Headquarters

12

Report on Predictive Maintenance Technology
for Equipment by Vibration Measurement
Introduction of Network-based Predictive Maintenance Systemtechnologies, the market has begun to see a wide range

1. Introductionof services based on models that store and analyze data

The maintenance of facilities and equipment inon servers and clouds via networks. The systemmanufacturing plants is shifting from preventive

enables remote status confirmation and predictive

ma int ena nce a nd brea kdown ma int ena nce t omaintenance from the network. However, the reality is

Summer 2021

"predictive maintenance." Preventive maintenance isthat at actual sites that our customers are facing, there

performed at regular intervals and timings, andare many cases where it is not possible or not allowed

corrective maintenance is done by maintenance andto upload sensing data to an external network or the

repairs after a failure, loss of production capacity or

cloud server for various reasons. We have developed adefective products. In contrast, predictive maintenancesystem that allows them to proceed even at such sites

is maintenance, where signs of failure are detected inby predictive maintenance using a local network. Thisadvance and repairs and maintenance are performed atreport introduces the network-based predictive

the appropriate timing. We have also been developing amaintenance system and the predictive maintenance1）tablet-type abnormal vibration detection system . At

technology it incorporates.

sites where maintenance activities are performed byNo.41

patrolling, this system measures and analyzes on the
spot the vibration state of the maintenance target
using sensors to confirm the chronological changes in

2. Overview of Predictive
Maintenance System

the state using charts and numerical values. In this2-1）System configuration

way, the system allows us to systematically implement

A schematic diagram of the network-based predictive

predictive maintenance, when an abnormality occurs,

maintenance system in operation is shown in Figure1.

by displaying according to the degree of abnormality.

The basic configuration consists of a "vibration sensor,"

This is a so-called portable predictive maintenance"sensor unit," and "predictive maintenance analysis

system, but with the advancement of sensing and IoT

program"（to be installed on a PC for use）. The sensor

Figure113

Schematic diagram of the maintenance system

Product Introductions

and the sensor unit are connected with the supplied
low noise cable. The sensor unit and the program（PC）
are connected using a LAN network. The LAN can also
use an existing network. It is operational even with thisbasic configuration, making it easy to handle. Moreover,by increasing the number of sensor units with aswitching hub, it will also be possible to increase thenumber of maintenance targets and sensing points,
check their status from a networked location via a web
screen on another PC and receive alerts by e-mail(Pilot model)

Figure2

Magnetic bracket

Organic piezoelectric vibration sensors

according to the degree of abnormality of themaintenance target（a mail server to be separately
required）.
2-2）Components
The following are the three components.
2-2-1）Organic piezoelectric vibration sensor

Summer 2021

We have developed a thin, compact, and lightweightvibration sensor that uses an organic piezoelectricelement2） that can be easily retrofitted. It is fixed byattaching it to the mating surface, but due to its
flexibility, it can be fixed to a slightly curved surface.

(Pilot model)

Figure3

Sensor unit

Figure5

Using a special magnetic bracket will also make itElimination of
backgroundvibration

possible to fix it with magnetic force（Figure2）.

No.41

2-2-2）Sensor units

2-2-3）Predictive maintenance analysis programs

Since each sensor unit is equipped with eight input

Octave analysis is conducted on vibration sensing

channels, all of which have built-in charge amplifiers,

data, based on which predictive maintenance ischarge output type sensors can be connected as they

performed by conducting "MT method（degree ofare. Therefore, in addition to the organic piezoelectric

abnormality analysis）" and "trend analysis（statevibration sensor mentioned above, commerciallyanalysis）" from the data. For each measurement point,

available vibration and acceleration sensors can also be

the "time waveform," "FFT analysis," "octave analysis,"used. In the sensor unit, the sensor signal is digitally"MT method," and "trend analysis" can be checked onconverted and transmitted from the LAN terminal to

the screen dashboard（Figure4）.

the PC on the analysis side through the network. The

It also has a function to differentiate data（Figure5）toLAN connection also allows for distributed placement

eliminate background vibration from the environmentof sensor units, making it possible to build a multi-point

as a disturbance signal. To check the current status ofsensing environment flexibly and cost-effectively

the maintenance target, the screen displays the status（Figure3）.

and alert level corresponding to the threshold value. Incase of an abnormality（every time the status changes
to Caution, Maintenance, or Danger）, an alert e-mail canbe sent to the maintenance staff.
14

Report on Predictive Maintenance Technology for Equipment by Vibration Measurement

Introduction of Network-based Predictive Maintenance System(Pilot model)

Figure4

Summer 2021
No.41

Predictive maintenance analysis programs

3. Predictive Maintenance Methods

abnormality will be captured through this kind of

To perform predictive maintenance based on changes

be used in the analysis, the top five frequencies with thein the vibration state of the maintenance target, it ismaximum change in vibration intensity from the octave

necessary to capture the changes in the vibration state

analysis data and another one（one can be selectedof the maintenance target from sensing data. This

arbitrarily）are automatically selected. Alternatively, allsystem uses the vibration data on which octaveof them can also be selected manually（Figure6）.

analysis of the state of vibration. For the frequencies toanalysis has been conducted. We have adopted thismethod because it is very compact compared to theamount of data in FFT analysis, which is widely usedin vibration analysis, and it is suitable for analysis using
the trend analysis and MT method described below.
3-1）Trend analysis（state analysis）
This method uses the vibration data of the maintenance

Figure6

Overview of trend analysis

target in normal（regular）operation as a reference toconduct the initial measurement. By using the3-2）MT method（degree of abnormality analysis）

difference value between the vibration data and the

The MT（Mahalanobis-Taguchi）method 3） is a patternsubsequent vibration measurement data to draw arecognition method that aims to determine normality

trend chart of how much the vibration intensity has

and abnormality based on the Mahalanobis distance. Itchanged/differed, it will be compared with theis widely used for various types of judgment, and sincethreshold value to capture signs of abnormality. It is a

it is simple and can easily detect the degree oftrend analysis characteristic to focus on relative

abnormality, it is incorporated into the predictive

changes rather than absolute changes, and signs ofmaintenance analysis program together with the trend

15

Product Introductions

analysis described above（Figure7）.

state and the degree of abnormality numerically has

This method captures the degree of abnormality by

improved the accuracy of its predictive maintenance.

creating a unit space from the vibration data obtained
when the maintenance target is operating normally（steady-state）and then calculating the Mahalanobis
distance（MT score）with the subsequent vibration as

4. Opportunities for Use andPre-verification Activities

data space. However, by preprocessing the data to

The maintenance targets assumed for this predictive

adjust the number of analysis dimensions, we havemaintenance system are pumps, motors, engines andfound that the time of appearance of the MT score

other machinery whose status can be sensed withindicates the degree of abnormality. The predictive

vibration. However, it is essential to verify in advancemaintenance analysis program is equipped with thisat the customer's site whether or not predictivefunction to adjust the number of dimensions, making it

maintenance is possible for the maintenance target.

possible to detect signs of abnormality based on the

Therefore, obtaining cooperation from the customers

MT score right before the failure of the maintenanceconsidering the introduction of the system, we ask

target or with enough time to spare before such anthem to allow us to make trial measurements inincident. Thus, the function can be used effectively byadvance. We also ask them to consider the possibility

the style of the customer's maintenance activities

of predictive maintenance and its cost-effectiveness（Figure8）.

after installation.

"MT method" are installed and conducted simultaneously
in this system. Capturing changes in the vibration

5. Specifications
The specifications of the organic piezoelectric
vibration sensor are shown in Table1, those of theSummer 2021

The abovementioned methods of "trend analysis" andsensor unit in Table2, and those of the predictive
maintenance analysis program in Table3. In actual
use, the number of units and the number of sensing
units will determine practical measurement settings
and the number of PCs in the predictive maintenance
Figure7Overview of MT method

analysis program. Thus, the frequency of datacollection and the scale of sensing will need to be
confirmed and planned with each customer.
＊The specification values are from the pilot model data and may
differ from the product.

Table1

Specification summary of Organic piezoelectric
vibration sensors

Element

Organic piezoelectric element（Thickness 1mm）

（Reference value）

Sensitivity

0.1pc/m/s（Reference value）

Frequency
range

0.4 〜 10,000 Hz（Reference value）

Dimensions

2

24×20×0.5mm（Reference value）

Cable

Low noize（3m standard）（Reference value）

Weightapprox. 1g（Cable not included） （Reference value）

Figure8 O
 verview of adjustment of analysis dimensions andpredictive timing
16

No.41

Report on Predictive Maintenance Technology for Equipment by Vibration Measurement

Table2

Specification summary of Sensor unit

Input Ch number

8ch（Built-in charge amplifier）

A/D Conversion

24bit（8ch at the same time）

Sampling frequency

51.2kHz

Input frequency range

0.16Hz 〜 20kHz

Introduction of Network-based Predictive Maintenance System

6. Conclusion
This "network-based predictive maintenance system"has been developed based on the concept of a systemthat can be used immediately at the manufacturing

ProtocolUDP/IP

Ethernet

1ch, 10/100/1000Mbps, RJ45

site, and we hope that it will be considered as a

Trigger

Photocoupler（Requires external power supply DC24V）

benchmark for installation. This system will be a part

Power supply

DC24V

Dimensions, Weight

W52×H126×D128mm, approx. 450g

of our VALQUA Predictive Maintenance System

Operating Environment

0-55℃, 95% relative humidity, non-condensing

Table3

 pecification summary of Predictive maintenanceS
analysis programs

FFT analysis,
Octave analysis（1/1, 1/3, 1/6, 1/12, 1/24）
Trend analysis (state analysis),
Predictive
MT method (degree of abnormality analysis),maintenance function
Alert display and email delivery by threshold
Background signal removal, Measurement by trigger,
Other functions
Remote panel connection using a web browser［Example］approx. 160GB / year ※ 1
Storage capacity （Settings: 8ch, 1/3 octave analysis, 10-minuteof analysis datainterval measurement※ 1 When not saving the time waveform data）
OS: Windows10, Processor: Intel Core i5
Operatingenvironment
equivalent or higher
VALQUA Sensor Unit ※ 2（NI9234［National Instruments］, connectable）
Connectable unit ※ 2 The number of connected sensor units depends
on the measurement settings and network
environment, so advance planning is required.
Analysis function

product range, and we hope that it will contribute to
the maintenance of production sites in various
industries.

7. References
1）Makoto Haneda（MOL Techno-Trade, Ltd.）, HisatakaSato, Tetsuya Komeda, Yasushi Aburatani: Valqua
Technology News, No.36, 3-6（2019）2）Y o s h i r o T a j i t s u , T e t s u y a K o m e d a : V a l q u aTechnology News, No.26, 12-17（2014）

Summer 2021

3）Masato Suzuki, Self-study: Signal Processing, Shuwa
System,（2017）

No.41

Hisataka Sato
Frontier Development Team,
Advanced Technology Development Department,
Research and Development Division17

Product Introductions

Mat Sensor Using Piezoelectric Sheet

when a voltage is applied. In this mat sensor

1. Introduction

application, the piezoelectric effect is used, and the

VALQUA has been developing organic piezoelectric
1）sheets using fluorine materials and abnormal vibration

voltage generated by applying force to the piezoelectric
sheet is used as a signal.

2）

detection systems as its application .

The characteristics of the fluorine material and the

Piezoelectric effectInverse Piezoelectric effectMechanical strain
produces a voltage

Applying voltage produces
a mechanical strain

carefully designed sheet structure enable piezoelectric
properties. As a result, our fluorine-based organic
piezoelectric sheet can be used even at highpossible with conventional organic（polymer-based）
piezoelectric materials. Other characteristic of thesesheets is that they do not lose their piezoelectric
properties even in high temperature and high humidity

Figure1 Functional expression mechanism of piezoelectric sheet2-2）Detection mechanism of conventional
mat sensors

environments（85℃ and 85% RH）. In addition, it is easy

Many mat sensors use a method called contact-type

to make them large in area, which is a common feature

method, as shown in Figure2. In the contact-typeof organic piezoelectric materials. This report

method, the contact points inside the sensor makeintroduced the mat sensor we have developed as an

contact with each other due to the applied pressure,

item that makes the most of these features.

which leads to conduction and detection of thepressure. It is a very simple detection mechanism, and

2. Detection Mechanism

the mechanism is easily understandable. On the other2-1）Function of piezoelectric sheet

to separate the contact points, and thus the system ishand, this method requires a structure（e.g., a spacer）

First, the functions of piezoelectric sheet will be

anticipated to become complicated for large-area

explained. Piezoelectric sheets are a f orm ofsensors. In addition, it is expected that the effect of

piezoelectric material. There are many inorganic andthe deterioration of the structure over time must beorganic piezoelectric materials. Also, there are several

considered as well.

types of detection mechanisms, but for simplicity, thedetection mechanism of our organic piezoelectric sheet

Contact point

will be explained as an example.
As shown in Figure1, piezoelectric materials have two
effects. The piezoelectric effect, in which a voltage is
generated when force is applied, and the inverse
piezoelectric effect, in which the material deforms

SpacerFigure2 Detection mechanism of sensor using contact-type method
18

Summer 2021

temperatures of 100℃ or higher, which was not

No.41

Mat Sensor Using Piezoelectric Sheet2-3）Detection mechanism of piezoelectric sheet

Piezoelectric material
responsiveness

Figure3 shows the detection mechanism of aconsisting of a piezoelectric sheet and electrodes placedon both sides of the sheet. It detects the voltage
generated when the sheet itself is distorted in theLoad（press）

Load（press）

thickness direction by the applied pressure. Thissystem does not require a spacer, and it is relatively
easy to fabricate a thin, large-area sensor.

UnloadUnloadVoltage output

piezoelectric sheet. The sensor has a simple structure

Mat sensor responsiveness

UnloadFigure4 Responsiveness of piezoelectric material and mat sensor

3. Development Details3-1）Setting target performanceElectrodeAs a performance indicator for our mat sensor, wePiezoelectric sheetreferred to JIS B 9717-1:2001（Safety of machinery-

Figure3

Pressure-sensitive protective devices - Part 1: General

Detection mechanism of piezoelectric sheet

Summer 2021

mats and pressure-sensitive floors）. This JIS

perpendicular to the sheet surface. On the other hand,summarizes the required properties for mat sensors toother piezoelectric materials can detect force in the

be installed in factories and other facilities. In thisdirection of the surface（tension, compression, andproject, we used this JIS as a reference to proceed withtorsion）. When used as a mat sensor, detecting only

our development of a mat sensor that would satisfy thevertical force like our type is assumed to be anproperties shown in Table1.

advantage in some applications.
Next, we are going to explain how piezoelectric sheets

No.41

principles for design and testing of pressure-sensitive

Our piezoelectric sheet detects force in the direction

detect force. In general, piezoelectric materials, whether
inorganic or organic, generate a voltage at the moment
when force is applied and thus can detect the force. In
contrast, they do not generate voltage when force isTable1

Test items and conditions

Test item

Test conditions

Mechanical properties
Durability test

2 million cycles vertical / diagonal room temperature
1 million cycles diagonally 14.5 degrees -20℃ , 50℃

Vibration test

1 ⇔30Hz/ up / down / left / right/ front/ back /5 minutes each

Static load test

Φ11/750N/8h,φ80/2000N/8h

On the other hand, as a mat sensor, there is also a need

Impactresistance test

R:10mm/1kg/ Dropped from:1000mm

to continuously detect force, not only at the moment

Weather resistance properties

when force is applied but also in the state when force is

Waterproof test

IP6X

being applied（i.e., when a person or object is on it）.

Cycle test

−20℃（12h）⇔ 50℃（12h）×10Figure4 illustrates the difference between theHeat aging test

66℃ /90 days room temperature 8 years
equivalent to exposure

High temperatureand high humidity
test

40℃ /90-95%RH/56 days

High temperaturetest

50℃ /72 hours

Low temperature
test−30℃ /72 hours

continuously applied and thus cannot detect staticforce.

responsiveness of piezoelectric materials and the
responsiveness required for use as a mat sensor. As
shown in the figure, to detect continuous force, theoutput voltage waveform from the piezoelectricmaterial needs to be converted to a form suitable for a
mat sensor. In this project, we dealt with it bydesigning a dedicated control circuit to perform the
waveform conversion.
19

Electrical properties
Dielectric strength
test

AC0.72kV/1mA、DC1kV/ >100MΩProduct Introductions3-2）Examining mat sensor structure
We examined the structure of a mat sensor that would

4. Characteristics of developed productsatisfy the required properties described above. The

Figure6 shows the appearance of the developed matpressure-sensing itself could be realized with a simple

sensor system. The system consists of a mat sensor

structure of a sensor consisting of a piezoelectric sheet（right）and a control circuit（left）. The latter is used forand electrodes as described above.

output waveform conversion.

However, this sensor is very thin（several hundred

In this system, the LED lamp of the control circuit

microns）and does not have sufficient mechanicallights up when pressure is applied to the mat sensor.

strength. The optimal structure was determined by

The control circuit can be further downsized andexamining a variety of structures to satisfy the

expanded functionally.

mechanical properties, weather resistance（water

As for the functional expansion of the control circuit,resistance）, and electrical properties.

for example, it will be possible to detect only the force
of arbitrary magnitude by adding a threshold setting3-3）Performance evaluation method and results

function. Also, patterning the electrodes on both sides

The performance test was conducted according to theof the piezoelectric sheet will make it possible to detect

JIS standard（JIS B 9717-1:2001）. We measured thethe force distribution. Furthermore, if a wirelessvoltage output when force was applied to the mat

communication function is built-in, it can be used as ansensor before and during each test, evaluating theIoT device and monitored remotely.

Summer 2021

pressure detection performance of the mat sensor.
For the durability test, we fabricated JIS-compliant test
equipment and conducted the test. Figure5 shows anexample of the equipment, a durability test machine forthe vertical load. Two million cycles of force wereapplied for the durability test.
The developed mat sensor satisfied the properties

No.41

shown in Table1.

Figure6Developed mat sensor system

5. Conclusion
Our fluorine-based organic piezoelectric sheet was
introduced. This time, we were able to develop a matsensor that complies with the required properties of JIS
Figure5

Durability test machine (example)

B 9717-1:2001. The piezoelectric sheet has no
mechanical mechanism and can be used for a long time.
It is thus expected to have a long time stableperformance as a mat sensor.
The size, shape, and detection sensitivity can be
designed according to the application. Also, since the20

Mat Sensor Using Piezoelectric Sheetpiezoelectric sensor is extremely thin（several hundredfor his great cooperation in the design and development

microns）and flexible, it can be applied as a thin matof the conversion circuit for the output voltage

sensor. Taking advantage of these features, the sensor

waveform. I sincerely appreciate his contribution to the

could be used in the security and health care, which areproject.

related to safety and security. We would also like torespond from our readers.

6. Acknowledgments

7. References
1）Y oshiro Tajitsu and Tetsuya Komeda: Valqua
Technology News, No.26, 12-17（2014）.

I would like to express our gratitude to Dr. Yoshiro

2）Makoto Haneda, Hisataka Sato, Tetsuya Komeda,

Tajitsu of Kansai University（Professor of the Faculty

Yasushi Aburatani: Valqua Technology News, No.36,

of Engineering Science Department of Electrical and3-6（2019）.

Electronic Engineering, Trustee of Kansai University）

Tetsuya Komeda
Summer 2021

New Application Exploration
Advanced Technology Development Department
Research and Development Division

No.41

21

Product Introductions

Heat Resistant Acrylic Rubber
L6070
Acrylic rubber is positioned as the third rubber material

1. Introduction

following fluororubber and silicone rubber for applications

For automobiles, many rubber products are used asthat require both oil resistance and heat resistance.

important functional parts, such as oil seals, belts, hoses,

Figure1 shows the positioning of oil resistance and heatpacking, O-rings, and diaphragms. This is because ofresistance of various rubber materials.

the unique properties of rubber materials that cannot

Acrylonitrile butadiene rubber, which has been widely

be replaced by other materials, such as ① large

used as an oil-resistant rubber, lacks heat resistance for

deformation capability, ② flexibility and ③ good

automotive applications which are becoming increasingly

1）

In recent years, the demand for sealing materials has

been increasingly replaced by acrylic rubber due tobeen increasingly growing for applications used in theprice issues balancing performance and costs.

engine periphery of automobiles as they are used in everharsher environments. Such environments include not
only oil and fluid resistance but also maintenance-freelong-life characteristics, space saving in the engine
compartment, heat resistance required by higher
performance and higher output, and others. Table1 shows
the seal parts and materials used in various types of oil.

Low ← Oil Resistance → Highsophisticated in performance. Also, fluororubber has

No.41

Table1 Oil and fluid resistant rubber parts for automobiles ２）
Oil classification
Engine oil

ATF mission
Oil
PSF

Fuel

Coolant
Brake fluid
Etc.

Part nameCrank oil seal
Cam oil seal
Valve stem seal
Oil pan packing
Head cover packing
Oil cooler hoseO-rings
Transmission oil seal
Oil cooler hoseO-ring and packing
Power stay hose
Rack end seal
Oil pump oil seal
O-ring and packing
Fuel hose
Evapo hose
Fuel pump diaphragm
Check valves
High pressure fuel hose
Regulator diaphragm
Injector seal
O-ring and packing
Radiator hose
Heater hoseBrake hose
Master cylinder cup
Wheel cylinder cup
Caliper seal

Material used
VMQ、FKM
VMQ
FKM
NBR、ACM
NBR、ACM
NBR、ACM
NBR、ACM
ACM、VMQ
NBR、ACM
NBR、ACM
NBR
U、NBR
NBR
NBR
NBR
NBR
NBR
NBR、FKM
NBR、FKM
NBR、FKMFKM
NBR、FKM
EPDM
EPDM
NR、SBR、CR
SBR
SBR
EPDM

Summer 2021

damping characteristics .

Low

Figure1←Heat Resistance

→

High

Oil resistance and heat resistance of various
rubber materials

2. Characteristics of L6070
Acrylic rubber is a copolymer composed mainly ofacrylic acid ester, and its ASTM abbreviation is ACM.
The chemical structure of acrylic rubber is shown in
Figure2.

Figure2

Chemical structure of acrylic rubber
22

Heat Resistant Acrylic Rubber L6070

The characteristics of acrylic rubber differs depending

developed material L6070 and the conventional materialon the combination of three types of monomers with

L1270 are described below.

different side chains（ethyl acrylate: EA, butyl acrylate:BA, and 2-methoxyethyl acrylate: MEA）. The chemical

2-1）Compression set properties

structures of the main component monomer species

As an index of the heat resistance of sealing materials,

3）

the compression set is used. Under the sameand their characteristics are shown in Figure3 .

environment, the lower the compression set is, thelonger the use you can expect as a quality sealingmaterial.
The method of measuring and calculating thecompression set is shown in Figure4 4）.

EA
BA
MEA
◎：Excellent○：Good△：Inferior

Figure3 C hemical structures and characteristics of acrylic
rubber monomers

Figure4 Method of measuring and calculating compression set

Since the main chain of acrylic rubber consists only of

In general, the compression set of 80% is used as thesaturated bonds, it is necessary to introduce functional

life expectancy of materials used for sealing materials 5）.

groups with crosslinking points. Table2 summarizes the

In this report, in order to calculate the seal life and thecharacteristics of acrylic rubber according to thetime to reach the compression set of 80% under thedifferences in cure sites.

environment of 150 ℃ which is required for seals used

Table2 T ypes and characteristics of functional groups at
various cure sites3）
Cure site

Cure rate Processability

Storagestability

Compression
Heat
setresistanceactive chlorine
group

〇

×

△

〇

〇

Epoxy group

×

〇

〇

〇

〇

Carboxyl group

〇

〇

〇

〇

〇

Due to its characteristics, acrylic rubber has been used
for oil seals and hoses in the engine periphery of
automobiles. Our existing acrylic rubber L1270 has also
been used as oil seals and gaskets in many engine
periphery applications, but it is becoming more difficultin the engine periphery, the compression sets of L6070
and L1270 are plotted to calculate the time to reach thecompression set of 80% from the approximate equation.

Compression set（%）

Summer 2021
No.41

Heat resistance Oil resistance Cold resistance
◎
○
△
○
△
◎
△
◎
○

for it to meet specifications under the high temperatureenvironment near the engine in recent years.
By utilizing our unique compound design technologythat we have cultivated over the years, we havedeveloped L6070 acrylic rubber, which has improved
heat resistance while maintaining the oil resistance ofacrylic rubber. The various characteristics of the23

Time（hr）

Figure5Compression set at 150℃ in Air

Product Introductions

Table3 T ime at compression set of 80% at 150℃
Approximate
expression

Rubber CodeL6070

y＝1.1575x0.4304L1270

y＝1.83x0.44

Time at compression
set of 80%

The API standard is a standard to classify quality,
setting the fuel efficiency, heat resistance, and wear

4

resistance of engine oil. It had classifications from SA to

5.35×103

SP, but some of them have been abolished by 2020.

1.88×10ILSAC is a standard that requires additional fuelCalculated from an approximate equation, the time toefficiency and classifies the SH to SP classifications ofreach the compression set of 80% in air at 150 ℃ is

API into GF-1 to GF-6. Table5 shows the quality

1.88×104 hours for L6070 and 5.35×103 hours for L1270.

classification of automotive engine oil 6），7）.

This indicates that the life of L6070 is expected to be
more than 3.5 times longer.
L6070 has good compression set properties even in ahigh temperature environment of 150 ℃ or higher.
When evaluated under the same test time, thecompression set of L6070 and that of L1270 are
equivalent, respectively 170 ℃ and 150 ℃, which meansthat an increase in service temperature can be
expected. The results of the compression set test under

API standard and ILSAC standard
ILSAC standard

Performance

Low

GF-1
GF-2
GF-3
GF-4

Performance

GF-5

High

GF-6

As for the SAE standard for classifying viscosity, theCompression set（%）

SAE J300 standard established by SAE is used. For
example, in the case that it is noted as 5W-30, theSummer 2021

high temperature environments are shown in Figure6.

Table5
API standard
SA
SB
SC
SD
SE
SF
SG
SH
SJ
SL
SM
SN
SNPlusSP

notation on the left side indicates viscosity at low
temperatures while the notation on the right side
indicates viscosity at high temperatures. Both indicatethat the higher the number is, the harder the engine
oil becomes. Table6 shows the viscosity classificationof automotive engine oil8）.
Figure6Temperature dependency of compression set

For the evaluation of engine oil resistance properties,2-2）Engine oil resistance properties

the following standards were used from the viewpoint

Automotive engine oil is classified by standards eachof availability: API: SN/CF（for simultaneous use offor its quality and viscosity. Each standard is shown inboth gasoline and diesel vehicles）, ILSAC: GF-5（fuelTable4.

efficiency, exhaust gas purification, oil degradation
Table4

Type ofstandard

Classification of engine oil

Standard name

Description

prevention, heat resistance and wear resistance）and
SAE: 5W-30（usable even at −30℃ outside temperature

Performance classification
API：American Petroleum
standards for internationally
Instituteused engine oils
Qualitystandard ILSAC：International
Standards that require more
Lubricant Standardization fuel-efficient performanceand Approval Committee
than API+ medium viscosity at high temperature）.

Viscosity SAE：Society of Automotive Standards for classifying oilstandard Engineers
viscosity

resistant. Figure7 shows the change of volume of both

The change of volume of both L6070 and L1270 after
the immersion test at 150℃ for 70 hours was small（lessthan 10%）, confirming that both materials werematerials after the immersion test.
24

No.41

Heat Resistant Acrylic Rubber L6070

Table6

SAE2-4）Product shape

J300

Low temperature
High temperature viscosity
viscosity
SAE
Pumping
Kinematic viscosity
Viscosity at
viscosity CCS viscosity（cP）/
viscosity（cP） （cSt）（100℃） high shear（cP）
grade
temperature /temperature（150℃、
Minimum Maximun 106S-1min.）（℃）（℃）

Since acrylic rubber L6070 has the same level of

0W

6,200/−35 60,000/−40

3.8

―

―

5W

6,600/−30 60,000/−35

3.8

―

―

and large-diameter products such as O-ring（VALQUA

10W 7,000/−25 60,000/−30

4.1

―

―

15W 7,000/−20 60,000/−25

5.6

―

―

20W 9,500/−15 60,000/−20

5.6

―

―

25W 13,000/−10 60,000/−15

9.3

―

―

4

<6.1

1.7

processability as that of general synthetic rubber, it canbe used to manufacture various cross-sectional shapes
No. 640）, V-packing（VALQUA No. 2631）, and X-ring（VALQUA No. 641）.
2-5）Mechanical properties

8

―

―

12

―

―

5

<7.1

2.0

The results of physical properties and various durability

16

―

―

6.1

<8.2

2.3

20

―

―

6.9

<9.3

2.6

tests of L6070 and L1270 are shown in Table8.

30

―

―

9.3

<12.5

Table8

40

―

―

12.5

<16.3

Characteristic

40

―

―

12.5

50

―

―

16.3

2.9
3.5（0W-40, 5W-40,
10W-40）3.7（15W-40, 20W-40,<16.3
25W-40, 40monograde）
<21.9
3.7

60

―

―

21.9

<26.1

3.7

Comparison of physical properties

Hardness
Tensile strength
Elongation

Test method

Unit

L6070

L1270

JIS K 6253

SHORE A

71

72

MPa

11.8

11.0

%

250

190

%

7

12

POINT

＋1

＋2

%

－3

＋3

%

－6

－3

POINT

－4

±0

SN/CF,
GF－5

%

＋1

－6

5W－30 oil

%

－6

－12

150℃ x70h

%

＋3.6

＋2.5

JIS K 6261℃

－21.5 －20.7

JIS K 6251

Oil resistance

Volume change（%）

Summer 2021

Condition:150℃× 70hr
Test piece:50mm × 25mm × 2t

Heat resistanceCompression
set factor

No.41
Figure7 Change of volume after gasoline oil immersion test2-3）Low temperature properties

JIS K 6262
25% compression 150℃ x70h
φ29×h12.5
Change ofhardness
Change oftensile strength
Change ofelongation
Change ofhardness
Change oftensile strength
Change ofelongation
Change ofvolumeLowtemperature TR10 value
properties

JIS K 6257
150℃ x70h

JIS K 6258

※ These are measured values, not standard values

The low-temperature properties were confirmed by thetemperature restraction test（TR test）. L6070 showed
the same TR10 value as L1270, and it was confirmed to

3. Applications

have the low-temperature properties that can be used

The newly developed acrylic rubber L6070 is expected

as a sealing material in the engine periphery. Table7

to be applied to the automotive market（especiallyshows the TR values for L6070 and L1270.

engine periphery）.
※O‌ i l f i l t e r g a s k e t s （a u t o m o b i l e s , c o n s t r u c t i o nTable725

machinery, agricultural machinery, etc.）head coverComparison of TR values
L6070

L1270

TR10（℃）

－21.5

－20.7

TR30（℃）

－16.5

－16.1

TR50（℃）

－12.9

－12.9

TR70（℃）

－8.7

－9.3

gaskets, oil seals, oil pump gaskets, etc.

Product Introductions

4. Conclusion

5. References

The acrylic rubber L6070 introduced here is a material

1）K oda Tadashi, Journal of the Society of Rubberwith upgraded heat resistance properties while

Science and Technology, Japan, 55, 689-697, 1982

maintaining the same level of oil resistance as that of2）Hiroshi Yoshida, Journal of the Society of Rubber

conventional materials. In automotive applications,

Science and Technology, Japan, 58, 141-147, 1985

there is a trend where the operating environment is3）Mamoru Sugiyama, Journal of the Society of Rubber

becoming hotter and hotter and thus seal materials are
required to have high heat resistance. We believe that

Science and Technology, Japan, 89, 22-27, 20164）Hirofumi Zushi, Valqua Technology News, No.36, 25-

this new material can handle the environment

28, 2019

adequately. In addition, the quality standard for engine

5）Toshio Kawamura, Valqua Review, Vol.26, No.6, 1982

oil was revised in October 2020. Since this revision has6）American Petroleum Institute, 2020

introduced stricter standards for the environment and7）I nternational Lubricant Standardization andoil performance has been improved, it is expected thatthe requirements for sealing products are also going toApproval Committee, 20208）SAE International, SURFACE VEHICLE STANDARD,

change. We, as a seal manufacturer, will continue to

SAE J300, 2015

strive to develop new materials and improve existingmaterials by quickly capturing the latest trends in theSummer 2021

market in order to meet the demands of our users.

Hirofumi Zushi
Elastomer Team,
Product Development Division
Research and Development Department

No.41

26

Elastomer for High Concentration
Chemicals and Ozone
ARCURYTM Series
1. Introduction
In the manufacturing process of various products, all materials used are required to be highly functional and clean.
Particularly in the manufacture of high-performance parts, the cleaning chemicals and ozone used are required to be ofincreasingly higher purity. At the same time, the control of particulates, metal contamination and organic matter
generated from cleaning wetted parts is becoming more stringent.
In response to these increasing demands, we have developed a lineup of sealing materials with excellent chemical resistanceand ozone resistance as well as excellent purity. In this report, the outline and features of each product are introduced.

2. Product Overview
Summer 2021
No.41

Table1

Basic properties of ARCURYTM

Product
name

ＡＲＣＵＲＹ-ＡＤ（arcley AD）

ARCURY-AL（arcurea AL）

ARCURY-OZT（arcurea OZT）

ARCURY-OZW（arcley OZW）

Features

It is excellent in purity
because of its excellent
resistance to acidic solutions
and reduced amount of elutionof metals and organics.

Resistance to alkaline solutions
such as ammonia, which has
been difficult to use withconventional fluororubber, is
excellent.

It is excellent in purity becauseof its excellent resistance toozone gas and ozone water andits reduced amount of elution of
metals and organic substances.

Resistance to ozone gas andozone water is excellent.
Compared with OZT, the heat
resistance is improved.

Appearancecolor

Dark amber transparent

Black

Transparent

White

Hardness（Shore A）

67

75

60

68

Tensilestrength
（MPa）

12.0

23.8

17.0

13.0

Elongation
（%）

190

220

580

230

100% stress
（MPa）

3.3

7.5

1.7

3.4

CompressiveSet（%）

25 ＊1）

31 ＊2）

48 ＊2）

37 ＊1）All values in the table are measured values, not standard values.
＊１)Compression set: 200℃ for 72hrs, Compression of25%, AS568-214 Using O-rings ＊２)Compression set: 150℃ for 72hrs, Compression of25%, AS568-214 Using O-rings

ARCURY−AD

ARCURY−AL
Figure127

ARCURY−OZTTM

Photographs of ARCURY

products

ARCURY−OZWProduct Introductions

3. Product Features3-2）Chemical resistance3-1）Purity
Table2 A mount of eluted metal elements in fluoric acidand ultrapure water

ARCURY-AD【Test conditions】
HCl（35%） 40℃× 168hr
40℃× 168hr
HNO（65%）
3（ng/ml）

Metallicelement

ARCURY-ADFFKM ofCompany A

FFKM ofCompany B

Na

0.6

1.6

1.3

K

0.6

2.8

0.4

Ca

0.9

＜0.5

0.7

Mg

0.9

0.6

0.5

Al

6.7

13

21

Fe

2.0

5.8

3.5

Cu

＜0.5

＜0.5

＜0.5

Pb

＜0.5

＜0.5

＜0.5

Meter

＜12.7

＜25.3

＜28.4

FFKM ofCompany A

FFKM ofCompany B

Na

0.6

2.1

0.5

K

0.6

1.8

＜0.5

Ca

0.6

0.6

＜0.5

Mg

＜0.5

0.9

＜0.5

Al

＜0.5

9.8

18

Fe

＜0.5

3.4

0.6

Cu

＜0.5

＜0.5

＜0.5

Pb

＜0.5

＜0.5

＜0.5

Meter

＜4.3

＜19.6

＜21.6

ARCURY-AD

General FKM【Test conditions】
40℃× 168hr
NH（35%）
3
NMP
80℃× 168hr

Figure2

NH（30%）3

NMP

ARCURY-AL

General FKM

Summer 2021

ARCURY-AD

HNO（65%）3

ARCURY-AL（ng/ml）

Metallicelement

HCl（35%）

Volume change rate（%）

Ultrapure water（80℃ ×30days）


Volume change rate（%）

Fluoric acid（25 ℃×30 days） 

No.41

Rates of change in volume after
immersion in each solution3-3）Surface condition after ozone gas exposure test
Table3

Photographs of the surface before and after exposure to ozone gas

Before the test

After the test
Exposure time：2000 hours
Concentration：160g/Nm3
Temperature：20℃

28

Elastomer for High Concentration Chemicals and Ozone

ARCURYTM Series3-4）Surface condition after ozone water immersion test
Table4

Photographs of the surface before and after exposure to ozone water

Before the test

After the test
Immersion time：2000 hours
Concentration：40mg/ℓ
Temperature：20℃

3-5）Change in hardness

Summer 2021

Change in hardness（point）

No data
due to dissolution

Test conditions
Ozone gas
Exposure time：2000 hours
Concentration：160g/Nm3
Temperature：20℃
Ozone water
Immersion time：2000 hours
Concentration：40mg/ℓ
Temperature：20℃

No.41
Figure3

Change in hardness after exposure to ozone gas and immersion in ozone water

4. Product Applications
The ARCURYTM Series is expected to be used for thefollowing applications:1）Seals for flange pipes, chemical containers and pipe
joints of cleaning lines in chemical plants.
2）Seals for equipment such as ozone generators andto solve the problems which existing products have.

6. References
1）T atsuhiro Oshita: Valqua Technology News, No.4, 1516（2002）2）V ALQUA: Elastomer Product Catalogue, No.MA06, 9

ozone cleaning equipment.

（2020）

5. Conclusionです。

※ "ARCURY" is a trademark of
VALQUA, Ltd.

It is anticipated that sealing materials will be required tomeet ever higher requirements. The ARCURYTM series,
introduced here, has excellent chemical and ozone
resistance, and we hope that it will be used in the future
29

Hiromasa Muraki
Technical Solution GroupH&S Sales Division

Recent Technology News Back Issues
No.40 Winter 2021
● Greetings

CEO● Introduction to Valqua Technology News No.40 Winter 2021

Toshikazu Takizawa
CTO

Mutsuo Aoki

● Customer Solutions
Improvement of construction quality through the common flange fastening certification system
Kawasaki Refinery, ENEOS Corporation Yosuke Koga,
VALQUA Corporation H&S Sales Division Shigeo Sakai● Customer Solutions《Contribution》
E ffectiveness of Flange Tightening Training and Expectations for VALQUA H&S at thePetrochemical Plant in Linyuan, Taiwan

Taiwan CNPC Corporation Lin-Yuan Petrochemical Plant, Petrochemical Division

Lin Hsin-Cheng● Technical Papers

Effects of carbon black on compression set with peroxide cross-linking elastomer
Elastomer Team, Product Development Department, Research and Development Division Ryosuke Nishi● Product introduction

High heat resistant non-silicone adhesive tape（Manufactured by Korea Taconic, AGC Group, P-KT:6323）
Product Group, High Performance Plastics Division Takeyuki Suzuki
Introduction of Flange Gap Gauge Technical Solutions Group, H&S Sales Division Masafumi Ina
Examples of Reciprocal Motion Applications of LFR SEALTM
Product Development Department, Research & Development Division Tetsuya Tokumaru



No.39 Summer 2020
● Greetings	CTO

Mutsuo Aoki

● Customer Solutions《Contribution》

Approaches to Improving Construction Quality with Hand Nutrunners（Plug type air-cooled heat exchanger）
Showa Yokkaichi Sekiyu Makoto Hasegawa
General Manager, H&S Sales Division Masayuki YamabeIntroduction and Application of Seal Quicksearcher（SQS）（Gland Packing）
H&S Sales Division, Technical Solutions Group Kiyohiro Matsumura● Technical Paper

Evaluation of Loosening Behavior of Bolted Fasteners with Fluoropolymer Gaskets
Koji Sato

Gasket & Gland Packing Team, Product Development Department, Research & Development Division● Technical Paper《Contribution》 Technology for Ion Beam Treatment of PTFE
Sumitomo Rubber Industries, Ltd,.

● Product Introductions

Hiroaki Nakano

Sealing materials for high-pressure hydrogen gas

Elastomer Team, Product Development Department, Research & Development Division Ryohei Nishihara
Introduction to Valqua Predictive Maintenance System VALVESTA™-HE210
		 Elastomer Team, Product Development Department, Research & Development Division Akihiro Nagano

No.38 Winter 2020
● Greetings

Representative Director, Chairman & CEO

Toshikazu Takisawa● Introduction to Valqua Technology News No.38 Winter 2020● Technical Paper

● Product Introductions

Director, Managing Executive Officer CTO & CQO

Mutsuo Aoki

Influence of Bolt Tightening Methods on the Sealing Performance of Large Diameter Bolted Pipe Flange Connections
China Research Institute Seal Engineering Development Group Xing Zheng
Product Development Department, Research & Development Division Koji Sato
Product Development Department, Research and Development Division Takahiro Fujihara
Hiroshima University Toshiyuki Sawa
Evaluation of the Compression methods on the Sealing Performance of Gland Packing
Product Development Department, Research & Development Division Masato Hamade
Comparison of Semi-Metallic Gasket’s Performance and Introduction of Kammprofile Gasket Serie

Product Development Department, Research & Development Division Satomi Takahashi
Introduction of High-speed Opening and Closing Cylinder Valve
Technical Solution Group, Sales Division Satoshi Murayama
Development of Spray Ball ™ for Tank Cleaning
Product Development Department, Research & Development Division Mayumi Motoyoshi
30

Summer 2021

● Customer Solutions

No.41

Aim for earth and people friendly production

Sheet Gasket
VALQUA HEAT RESIST SHEETTM（ＨＲＳ）
Sheet gasket that can be used at high temperatures of 1000°
Cor higher. It does not contain RCF (Refractory Ceramic Fiber)
and is exempt from the Regulation of Industrial Safety and
Health Law.
● Operating temperature range: -200 to 1200℃ ● Maximum pressure: 1.0MPa*Please refer to our catalog for details.

UNIVERSAL HYPERTM（ＵＦ300）
Sheet gasket that can be integrated in chemical lines.
In addition to stability at high temperatures and long-term use,chemical resistance has been improved, greatly expanding therange of applicable ﬂuids.
It can be used for both strong acid and strong alkali lines.
● Operating temperature range: -200 to 300℃ ● Maximum pressure: 3.5MPa*Please refer to our catalog for details.

ThinkPark Tower 24F
2-1-1 Osaki, Shinagawa-ku, Tokyo 141-6024, Japan
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TEL：(81)3-5434-7376
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No.41 Summer 2021

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