GF-200S

Fluoroelastomers

Technical Information
Introduction

Processing

Viton™ GF-200S* fluoroelastomer is a 70% fluorine,
peroxide-cured fluoroelastomer similar to Viton™
GF-600S, but with a significantly lower gum polymer
viscosity of ~25 (ML at 121 °C [250 °F]). Viton™
GF-200S utilizes the latest technology from Chemours,
advanced polymer architecture (APA), which includes
a novel peroxide cure site along with an optimized
molecular weight distribution.

A load factor of >72% for internal mixing of Viton™
GF-200S is suggested. The suggested process aidsfor Viton™ GF-200S are 0.75 phr of Struktol® HT-290,
either alone or in combination with 0.5 phr of PAT-777,
or combinations of 0.5 phr Armeen® 18D with carnauba
wax or Struktol® WS-280. The use of TMAIC (trimethallyl
isocyanurate) is NOT suggested, as it causes poor moldrelease and high compression set. Viton™ Curative No. 7(VC-7) is the suggested coagent for all Viton™ GF-200S
compounds and is usually used at a 2.5 phr level or lower,
unless high modulus is needed. High levels of VC-7 canbleed out and cause molding flaws.

Features• Excellent fluid resistance to aromatic hydrocarbons
and alcohols, including methanol, oils, steam, and acids• Is ideal for blending with Viton™ GF-600S to reachintermediate viscosity ranges for injection molding• Improved mold release/mold fouling properties• Improved mold flow and less shear sensitivity than
65 Mooney Viton™ GF-600S

Safety and Handling
Before handling or processing Viton™ GF-200S, be sure toread and be guided by the suggestions in the Chemours
technical bulletin, “Handling Precautions for Viton™ andRelated Chemicals.”• Excellent physical properties with high elongation, bothoriginal and aged

Product Description• Heat, fluids, and low temperature properties
comparable to Viton™ GF and GF-600S

Chemical Composition

Copolymer of hexafluoropropylene,
vinylidene fluoride, and tetrafluoroethylene
with a cure site monomer

Physical Form

SheetAppearance

White to tanOdorNone

Mooney Viscosity, ML 1 + 10
at 121 °C (250 °F)

25Specific Gravity

1.90

Storage Stability

Excellent

Fluorine, %~70

• Improved water resistance/lower volume swell in water• Excellent compression set resistance with either lowor no post-cureViton™ GF-200S was formerly named VTR-8605.

Viton™

Fluoroelastomers

Table 1. General Properties of Viton™ GF-200S Compared to Viton™ GF-300
Viton™ GF–300

Viton™ GF–200S50/50 Blend

Viton™ GF–600S

30

23

38

58

A48–01

A48–03

A48–04

A48–05Viton GF-300

100———

Viton GF-200S—

10050—

Viton™ GF-600S

—

—

50100

Zinc Oxide

3333

N990 (MT Black)30

303030Viton Curative No. 7 (VC-7)3333

Mooney Viscosity (ML 1 + 10 at 121 °C [250 °F]) on Gum Polymers
1 + 10 ReadingCompound DD-1964 No.
™
™

™

®

Varox DBPH-50

2222Total phr Lab

138138138

138

Minimum, MU

181322312 Pt. Rise, min

26.5

24.8

23.0

18.4

5 Pt. Rise, min

29.1

26.2

24.2

19.8

10 Pt. Rise, min

>30

27.7

25.7

20.9

Mooney Scorch at 121 °C (250 °F)

ODR at 162 °C (324 °F), 3 Degree Arc, 100 Range, 30 Min Clock
M-L, dNm

76

1016ts-2, min

1.4

1.4

1.3

1.4t’50, min

3.2

3.1

3.0

3.1t’90, min

6.6

5.8

5.3

6.2

M-H, dNm

136

173

168

1660.61.1

1.7

MDR 2000 at 177 °C (351 °F), 0.5 Degree Arc, 100 Range, 12 Min Clock
M-L, dNm

0.7ts-2, min

0.5

0.4

0.4

0.4t’50, min

0.7

0.7

0.7

0.6t’90, min

1.6

1.1

1.1

1.0t’95, min

2.2

1.4

1.3

1.3

M-H, dNm

23.6

33.6

33.2

32.7

Physical Properties at RT—Original (Cured 7 min at 177 °C [351 °F]—No Post-Cure)
M-100, MPa

3.6

4.5

4.8

4.7

Tensile, MPa

12.3

13.3

13.3

14.3

T-B , psi

1,781

1,930

1,931

2,069

Elongation, %336278

264291

Hardness A, pts

69717071

10.5

10.9

6.6

6.2

“Hot” Tear Strength at 150 °C (302 °F)—Original (Cured 7 min at 177 °C [351 °F]—No Post-Cure)
Tear Die B, N/mm

11.2

11.4

Physical Properties at RT—Original (Cured 7 min at 177 °C [351 °F]—Post-Cured 2 hr at 232 °C [450 °F])
M-100, MPa

5.0

6.3

Tensile, MPa

20.0

18.0

18.7

20.0

T-B , psi

2,904

2,614

2,714

2,904

Elongation, %300

246237285

Hardness A, pts

7276

74

74
continued

Viton™

FluoroelastomersTable 1. General Properties of Viton™ GF-200S Compared to Viton™ GF-300 (continued)
Viton™ GF–300

Viton™ GF–200S

50/50 Blend

Viton™ GF–600S– No Post-Cure

34

20

20

19– Post-Cure at 232 °C (450 °F)

26

16

14

16

– No Post-Cure

43

26

2424

– Post-Cure at 232 °C (450 °F)

36

20

1920

Compression Set , Method B, O-Rings
22 hr at 200 °C (392 °F)

70 hr at 200 °C (392 °F)

Physical Properties at RT—Heat-Aged 70 hr at 250 °C (482 °F) in Oven
M-100, MPa

4.9

5.2

5.6

5.4% Change, M-100–1–17–15–13Tensile, MPa

17.0

18.6

18.2

18.2

% Change, T-B

–15

3

–3–9

Elongation, %325

296275293% Change, E-B

820

163Hardness, A, pts

757877

77

Pts Change

3233

3.8

4.1

4.2

Physical Properties at RT—Heat-Aged 70 hr at 275 °C (527 °F) in Oven
M-100, MPa

3.0% Change, M100

–40

–40

–39

–33

Tensile, MPa

7.3

11.8

12.9

13.2

% Change, T-B

–64

–34

–31–34

Elongation, %391

355

347

340

% Change, E-B

304447

19Hardness, A, pts

7578

77

77

Pts Change

3233

Physical Properties at RT—Aged 168 hr at 100 °C (212 °F) in ASTM # 105 Oil (5W/30 Motor Oil)
M-100, MPa

6.2

7.0

6.4

6.7% Change, M100

23

12–3

8Tensile, MPa

10.6

10.8

10.4

10.5

% Change, T-B

–47

–40

–45

–47

Elongation, %

154

141

145

140% Change, E-B–49–43–39–51

Hardness, A, pts

75

7977

77

Pts Change

3333

Volume Swell, %

1.4

1.6

1.6

1.6

–6.1

–5.0

–5.4

–6.0

Low Temperature Testing (Post-Cured)
Tg by DSC, °C (Inflection)

Fluid Immersions - Volume Swell—168 hr at 23 °C (73 °F), Unless Noted
Fuel C, %VS

2.5

2.9

3.4

3.3

M15 Fuel, %VS

6.3

7.0

7.2

7.7

Methanol, %VS

3.7

3.4

3.3

3.3

Distilled Water at 100 °C (212 °F)

4.9

3.7

3.7

3.8

Viton™

Fluoroelastomers

Test Procedures
Property Measured

Test Procedure

Compression Set

ASTM D395, Method B (25% deflection)

Hardness

ASTM D1414, durometer A

MDR (moving die rheometer)

ASTM D5289

Mooney Scorch

ASTM D1646, small rotor at 121 °C (250 °F)

Mooney Viscosity

ASTM D1646, ten pass at 121 °C (250 °F)

ODR (oscillating disk rheometer)

ASTM D2084

Property Change After Heat Aging

ASTM D573

Stress/Strain Properties
100% Modulus
Tensile Strength (T-B)
Elongation (E-B)

ASTM D412, pulled at 8.5 mm/sec (20 in/min)

Tear Die B

ASTM D624

Tg by DSCDDE Custom (Akron MDSC – Tg)

Volume Change in Fluids

ASTM D471

Test temperature is 23 °C (73 °F), except where specified otherwise.

For more information, visit Viton.com
The information set forth herein is furnished free of charge and based on technical data that Chemours believes to be reliable. It is intended for use by persons having technical skill, at their own
discretion and risk. The handling precaution information contained herein is given with the understanding that those using it will satisfy themselves that their particular conditions of use present
no health or safety hazards. Because conditions of product use are outside our control, Chemours makes no warranties, express or implied, and assumes no liability in connection with any useof this information. As with any material, evaluation of any compound under end-use conditions prior to specification is essential. Nothing herein is to be taken as a license to operate under or arecommendation to infringe any patents.
NO PART OF THIS MATERIAL MAY BE REPRODUCED, STORED IN A RETRIEVAL SYSTEM OR TRANSMITTED IN ANY FORM OR BY ANY MEANS ELECTRONIC, MECHANICAL, PHOTOCOPYING, RECORDING OR OTHERWISEWITHOUT THE PRIOR WRITTEN PERMISSION OF CHEMOURS.

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Replaces: VTE-A10164-00-A0705
C-11074 (9/20)