GAL-200S

Fluoroelastomers

Technical Information
Introduction
Viton™ GAL-200S* fluoroelastomer is a low viscosity,
66% fluorine, peroxide-curable fluoroelastomer. Viton™
GAL-200S is manufactured using the latest technology,
Advanced Polymer Architecture (APA). Viton™ GAL-200S
includes a novel peroxide cure site and has an optimized
molecular weight distribution.

Viton™ GAL-200S compounds and is commonly used at a
3 phr level or lower, unless high modulus is needed. Whenused at higher levels, VC-7 can bleed out and cause moldfouling and molding flaws. The use of TMAIC (trimethallylisocyanurate) is NOT recommended, as it causes poor
mold release and high compression set. A peroxide levelof 1.5 phr is suggested for this fast curing FKM polymer.

Features

Safety and Handling• Peroxide-curable polymer similar to Viton™ AL-300

Before handling or processing Viton™ GAL-200S, read andbe guided by the suggestions in the Chemours technicalbulletin, “Handling Precautions for Viton™ and RelatedChemicals.”• Improved low temperature resistance compared tobisphenol-cured 66% fluorine copolymer• Improved water, steam, and coolant resistancecompared to bisphenol-cured, 66% fluorine polymer• Cures exceptionally fast to a high state of cure
• Improved mold release/mold fouling properties
compared to previously available technology peroxidecured polymer• Good physical properties with high elongation, bothoriginal and aged
• Excellent compression set resistance with either low
or no post-cure
Processing
A high load factor, 72% or higher, is recommended forinternal mixing of Viton™ GAL-200S. The suggested
process aids are 0.75 phr of Struktol® HT290, either
alone or in combination with 0.5 phr of PAT-777.
Combinations of 0.5 phr Armeen® 18D with carnauba
wax or Struktol® WS280 may also be used. Viton™
Curative No. 7 (VC-7) is the suggested co-agent for

Viton™ GAL-200S was formerly named VTR-8675.

Product Description
Chemical Composition

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

Physical Form

SheetAppearance

White to tan

Odor

None

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

25Specific Gravity

1.79

Storage Stability

Excellent

Fluorine, %~ 66Viton™

Fluoroelastomers

Table 1. Fundamental Properties of Viton™ GAL-200S
Viton™ GBL-200S

Viton™ GAL-200S

ML-10 at 121 °C (250 °F) (gum)2928

Viton GBL-200S

100—™

Viton GAL-200S—100

Zinc Oxide

33N-9903030

Viton™ Curative No. 7 (VC-7)

33®

Varox DBPH-50

22Total phr Lab

138138™

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

17172 pt Rise, min

27.4

29.5

5 pt Rise, min>30>30

M-L, dNm

76ts-2, min

1.4

1.6t’50, min

3.1

3.2t’90, min

5.2

6.3

M-H, dNm

146

130ODR at 162 °C (324 °F), 3° Arc, 100 Range, 30 Min Clock

MDR 2000 at 177 °C (351 °F), 0.5° Arc, 100 Range, 6 Min Clock
M-L, dNm

0.7

0.7

ts-1, min

0.4

0.4

ts-2, min

0.5

0.5t’50, min

0.7

0.7t’90, min

1.4

1.2t’95, min

1.9

1.6

M-H, dNm

30.026.2

Spider Mold Flow Test—Sprue 0.8 mm—138 bar (2,000 psi) Inject Pressure (Cured 5 min at 177 °C [351 °F])
Total Shot Weight, g

39.9

40.1

Weight of Spider, g

26.7

26.0

Fill Factor, %67

65

M-10, MPa

0.7

0.7

M-100, MPa

3.1

2.6

Tensile, MPa

11.1

12.2

T-B, psi

1604

1770

Elongation, %362

447

Hardness, A, pts

6766

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

5.8

6.2
continued2

Viton™

Fluoroelastomers

Table 1. Fundamental Properties of Viton™ GAL-200S (continued)
Viton™ GBL-200S

Viton™ GAL-200S

Physical Properties at RT—Original (Cured 7 min at 177 °C [351 °F]—Post-Cured at 232 °C [450 °F] as noted)
M-10, MPa

Post-Cured: 2 hr

Post-Cured: 2 hr

0.9

0.8

M-100, MPa

3.9

3.5

M-300, MPa

15.7

15.9

Tensile, MPa

16.7

17.8

T-B, psi

2,416

2,582

Elongation, %

307

393

Hardness, A, pts

7270

Tg by Modulated DSC, °C

–19.4

–24.0

TR-10, °C

–16.4

–19.0

– No Post-Cure2221– Post-Cured at 232 °C (450 °F) (as noted)

1714– No Post-Cure2933– Post-Cured at 232 °C (450 °F) (as noted)

2726

M-100, MPa

4.2

4.0% Change, M-100

716Tensile, MPa

19.5

20.8

Low Temperature TestingCompression 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 (Slabs Post-Cured)% Change, T-B

1717Elongation, %298

330

% Change, E-B–3–16

Hardness, A, pts

74

72

Pts Change

22M-100, MPa

3.5

3.9% Change, M-100–1114Tensile, MPa

15.9

15.7

% Change, T-B–5–12Elongation, %344

287

% Change, E-B

12–27Hardness, A, pts

7373

Pts Change

13

Physical Properties at RT—Heat-Aged 70 hr at 275 °C (482 °F) in Oven (Slabs Post-Cured)continued

3

Viton™

Fluoroelastomers

Table 1. Fundamental Properties of Viton™ GAL-200S (continued)
Viton™ GBL-200S

Viton™ GAL-200S

M-100, MPa

4.4

4.0

% Change, M-100

1416Tensile, MPa

8.2

8.4

% Change, T-B–51–53Elongation, %

164

176

% Change, E-B–47–55

Hardness, A, pts

7574

Pts Change

34

Volume Swell, %1.4

1.1Physical Properties at RT—Aged 168 hr at 150 °C (302 °F) In ASTM #105 Oil (5W/30)

Fuel Resistance—Volume Swell Tested 168 hr at 23 °C (73 °F)
Fuel C, %VS

5.2

5.6

85/15 Fuel C/Methanol, %VS

21.9

33.6

Water, %VS

4.8

5.2

Specific Gravity

1.856

1.831

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 ViscosityASTM 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.

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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.
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