GFLT-200S

Fluoroelastomers

Technical Information
Introduction
Viton™ GFLT-200S* fluoroelastomer is a low viscosity
67% fluorine, peroxide-cured, low temperature
fluoroelastomer. GFLT-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.
Features• Is ideal for blending with Viton™ GFLT-600S to reachintermediate viscosity ranges for injection and transfer
moldinghigh compression set. Viton™ Curative No. 7 (VC-7) is thesuggested coagent for all GFLT-200S compounds andusually used at a 3 phr level or lower, unless high modulus
is needed. High levels of VC-7 can bleed out and cause
molding flaws. A peroxide level of 1.5–2 phr is suggested
for this fast-curing FKM polymer.
Safety and Handling
Before handling or processing Viton™ GFLT-200S, readand be guided by the suggestions in the Chemours
technical bulletin, “Handling Precautions for Viton™ andRelated Chemicals.”
Product Description• Cures exceptionally fast to a high state of cure• Improved mold release/mold fouling properties

Chemical Composition• Improved mold flow and less shear sensitivity for a25 Mooney peroxy-cured FKM

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

Physical FormSheet• Good physical properties with high elongation, bothoriginal and agedAppearance

White to tanOdorNone

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

25Specific Gravity

1.86

Storage Stability

Excellent

Fluorine, %~67

• Improved water resistance/lower volume swell in water• Excellent compression set resistance with either lowor no post-cureProcessing
A load factor of 72%+ for internal mixing of GFLT-200S
is preferred. The suggested process aids for GFLT-200S
are 0.75 phr of Struktol® HT290, either alone or incombination with 0.5 phr of PAT-777, or combinationsof 0.5 phr Armeen® 18D with carnauba wax or Struktol®
WS280. The use of TMAIC (trimethallyl isocyanurate)is NOT suggested, as it causes poor mold release and*Viton™ GFLT-200S was formerly named VTR-8555.

Viton™

Fluoroelastomers

Table 1. General Properties of Viton™ GFLT-200S
Viton™ GFLT-200S
ML-10 at 121 °C (250 °F) (gum)27

Viton GFLT-200S

100™

Zinc Oxide

3N990 (MT Black)30

Viton™ Curative No. 7 (VC-7)

3Varox DBPH-50

2Total138®

Mooney Scorch at 121 °C (250 °F)
Minimum

162 Pt. Rise, min

28.05 Pt. Rise, min>30

10 Pt. Rise, min—ODR at 162 °C (324 °F), 3° Arc, 100 Range, 30 Min Clock
M-L, dNm

6ts-2, min

1.3t’50, min

2.7t’90, min

4.2M-H, dNm

163

MDR 2000 at 177 °C (350 °F), 0.5° Arc, 100 Range, 6 Min Clock
M-L, dNm

0.8ts-2, min

0.4t’50, min

0.6t’90, min

1.1t’95, min

1.3M-H, dNm

32.2

Rosand Capillary Rheometer at 100 °C (212 °F), 1.5 mm die—L/D = 0/1 and 10/1
Shear Rate, sec–1

Pressure (short die L/D = 0/1), MPa

113

3.0

452

4.6

1,129

6.0

2,221

7.4

Spider Mold Flow Test—Sprue 0.8 mm (0.031 in)—Transfer Pressure 103 bar—(Cured 7 min at 177 °C [350 °F])
Total Shot Weight, g

39.9

Weight of Spider, g

27.5

Fill Factor, %69%

Physical Properties at RT—Original (Cured 7 min at 177 °C [350 °F]—No post-cure)
M-10, MPa

0.7

M-100, MPa

4.2

Tensile, MPa

9.7

T-B, psi

1,404

Elongation, %226

Hardness, A, pts

68continued2

Viton™

Fluoroelastomers

Table 1. General Properties of Viton™ GFLT-200S (continued)
Viton™ GFLT-200S“Hot” Tear Strength at 150 °C (302 °F)—Original (Cured 7 min at 177 °C [350 °F]—No post-cure)
Tear Die B (nicked), N/mm

5.5

Physical Properties at RT—Original (Cured 7 min at 177 °C [350 °F]—Post-cured 2 hr at 232 °C [450 °F] as noted)
M-10, MPa

0.9

M-100, MPa

5.3Tensile, MPa

15.3

T-B, psi

2,213

Elongation, %214

Hardness, A, pts

72

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

4.0% Change, M100

–24

Tensile, MPa

15.6% Change, T-B

4Elongation, %264% Change, E-B

27Hardness, A, pts

74

Pts Change

2Physical Properties at RT—Heat Aged 70 hr at 275 °C (527 °F) in Oven
M-100, MPa

2.6% Change, M100

–51

Tensile, MPa

9.4% Change, T-B–37

Elongation, %380% Change, E-B

83

Hardness, A, pts

71

Pts Change–1Physical Properties at RT—Aged 168 hr at 150 °C (302 °F) in ASTM #105 Oil (5W/30)
M-100, MPa

5.3% Change, M100

1Tensile, MPa

9.5% Change, T-B–37Elongation, %157% Change, E-B–25Hardness, A, pts

74

Pts Change

2

Volume Swell, %0.4
continued

3

Viton™

Fluoroelastomers

Table 1. General Properties of Viton™ GFLT-200S (continued)
Viton™ GFLT-200S
Compression Set, Method B, O-Rings
22 hr at 200 °C (392 °F)– No Post-cure

19– Post-cured at 232 °C (450 °F)

1370 hr at 200 °C (392 °F)– No Post-cure22– Post-cured at 232 °C (450 °F)

21

Low Temperature Testing
TR-10, °C–24.4

Tg by DSC, °C–25.5

Volume Swell After Immersion—168 hr at temperature as noted
Fuel C at 23 °C (73 °F)

6.3

CM15 (85/15 Fuel C/Methanol) at 23 °C (73 °F)

12.4

Methanol, 23 °C (73 °F)

8.8

Water at 100 °C (212 °F)

3.3

Table 2. Blend of Viton™ GFLT-200S and Viton™ GFLT-600S
Viton™ GFLT-200S

Blend

Viton™ GFLT-600S

ML-10 at 121 °C (250 °F) (gum)244161

Viton™ GFLT-200S10050—Viton™ GFLT-600S—50100Zinc Oxide

333MT Black (N-990)

303030Viton Curative No. 7 (VC-7)

333Varox® DBPH-50

222Total

138

138

138

162536™

Mooney Scorch at 121 °C (250 °F)
Minimum
2 Pt. Rise, min

26.7

22.2

20.0

5 Pt. Rise, min

27.6

23.7

21.2

10 Pt. Rise, min

>30

24.9

22.3

M-L, dNm

61118ts-2, min

1.5

1.2

1.2t’50, min

2.9

2.6

2.5t’90, min

4.2

4.1

4.2

M-H, dNm

169

167

161

ODR at 162 °C (324 °F), 3° Arc, 100 Range, 30 Min Clockcontinued

4Viton™

Fluoroelastomers

Table 2. Blend of Viton™ GFLT-200S and Viton™ GFLT-600S (continued)
Viton™ GFLT-200S

Blend

Viton™ GFLT-600S

MDR 2000 at 177 °C (350 °F), 0.5° Arc, 100 Range, 6 Min Clock
M-L, dNm

0.6

1.2

2.0ts-2, min

0.4

0.4

0.4t’50, min

0.6

0.6

0.6t’90, min

1.0

1.0

1.0t’95, min

1.3

1.2

1.2

M-H, dNm

35.2

33.6

32.4

Rosand Capillary Rheometer at 100 °C (212 °F), 1.5 mm die—L/D = 0/1 and 10/1Pressure (short die L/D = 0/1), MPa

Shear Rate, sec–1
113

3.5

4.0

5.2

452

5.5

5.5

6.3

1,129

6.6

6.7

7.3

2,221

7.8

7.9

8.4

Physical Properties at RT—Original (Cured 7 min at 177 °C [350 °F]—No post-cure)
M-100, MPa

5.0

5.1

4.7

Tensile, MPa

12.1

13.3

12.8

T-B, psi

1,759

1,929

1,862

Elongation, %

188

203

214

Hardness, A, pts

6767

65

7.5

8.5

“Hot” Tear Strength at 150 °C (302 °F)—Original (Cured 7 min at 177 °C [350 °F]—No post-cure)
Tear Die B (nicked), N/mm8.1

Physical Properties at RT—Original (Cured 7 min at 177 °C [350 °F]—Post-cured 2 hr at 232 °C [450 °F])
M-100, MPa

6.0

6.1

5.6

Tensile, MPa

16.8

16.9

16.6

T-B, psi

2,437

2,451

2,408

Elongation, %

198

199

206

Hardness, A, pts

70

68

67

– No Post-cure131114– Post-cured at 232 °C (450 °F)

9911– No Post-cure202020– Post-cured at 232 °C (450 °F)

1714

17TR-10, °C

–24.0

–24.8

–24.8

Tg by DSC, °C

–26.0

–26.1

–25.3

Compression Set, Method B, O-Rings (2 hr post-cure)
22 hr at 200 °C (392 °F)

70 hr at 200 °C (392 °F)

Low Temperature Testing5Viton™

Fluoroelastomers

Test Procedures
Property Measured

Test Procedure

Compression Set

ASTM D395, Method B (25% deflection)

Compression Set, O-Rings

ASTM D395, Method B (25% deflection)

Hardness

ASTM D1414, durometer A

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)

Temperature Retraction (TR-10)

ASTM D1329

Volume Change In Fluids

ASTM D471

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

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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.
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