A-500

Fluoroelastomers

Technical Information
Introduction

Safety and Handling

Viton A-500* fluoroelastomer is a new generation“A-family” gum polymer that provides improved processing
when compared with existing fluoroelastomers.

Before handling or processing Viton™ A-500, please readand be guided by the recommendations as described in
the Chemours technical bulletin, “Handling Precautions for
Viton™ and Related Chemicals.”™

Viton™ A-500 is designed for use with the clean molding
bisphenol curative, Viton™ Curative No. 50.
Compared with “A-family” dipolymers, Viton™ A-500
provides:• Improved compression molding• Better mold release

Viton™ A-500 should be handled similar to other types ofViton™. Keep off skin and wash well after handling. For safe
handling of other compounding ingredients, please referto the respective manufacturers’ information.
Product Description• Less mold fouling

Chemical Composition

Dipolymer of hexafluoropropylene andvinylidene fluoride• Faster cure rate

Physical Form

Free-flowing pellets• Improved compression set resistance

Color

Silver-gray

Odor

None

Specific Gravity

1.82

Solubility

Low molecular weight esters andketones

Storage StabilityExcellent

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

50Applications• Compression and transfer molding– O-Rings– Gaskets– Seals• Profile extrusion• Calendered goods*Viton™ A-500 was formerly named VTR-6517.

Viton™

Fluoroelastomers

Table 1. General Properties of Viton™ A-500 Compared with Viton™ E-60C
Viton™ A-500

Viton™ E-60C

Viton™ A-500

96.5

—

Viton E-60C—

100

MT Black3030

High-Activity Magnesium Oxide

33Calcium Hydroxide

66VC-502.5—

VPA No. 10.5—

VPA No. 30.5—

Minimum, in·lb4741

Time to 1-unit rise, min3030™

Stock Properties
Mooney Scorch, MS at 121 °C (250 °F)

ODR at 177 °C (350 °F), Microdie, 3° Arc, 12 min
2.0 (17)

1.7 (15)

ts2, minML, N·m in·lbf

1.5

2.1t’90, min

2.9

4.4

14.2 (123)

13.8 (119)MH, N·m in·lbf
Vulcanizate Properties

Press-Cure: 10 min at 177 °C (350 °F)
Post-Cure: 24 hr at 232 °C (450 °F)
Stress/Strain—Original
100% Modulus, MPa (psi)

7.2 (1,050)

7.2 (1,050)

Tensile Strength, MPa (psi)

15.6 (2,260)

14.2 (2,060)

Elongation at Break, %

195

180

Hardness, durometer A, points

78

79

Stress/Strain—After 70 hr at 275 °C (528 °F)
100% Modulus, MPa (psi)

5.6 (810)

6.6 (950)

Tensile Strength, MPa (psi)12.5 (1,810)

12.0 (1,740)

Elongation at Break, %

205

185

Hardness, durometer A, points

78

79

22 hr at 200 °C (392 °F)

91170 hr at 200 °C (392 °F)

152270 hr at 232 °C (450 °F)

3143

336 hr at 200 °C (392 °F)

26

43Compression Set, Method B, O-Rings, %2

Viton™

Fluoroelastomers

Test Procedures
Property Measured

Test Procedure

Compression Set

ASTM D395-85, Method B (25% deflection)

Compression Set—Low Temperature

ASTM D1299-87, Method B (25% deflection)

Compression Set, O-Rings

ASTM D1414-78 (87)

Hardness

ASTM D2240-87, durometer A

Mooney Scorch

ASTM D1646-87, using the small rotor. Minimum viscosity and time to a1-, 5-, and 10-unit rise are reported.

Mooney Viscosity

ASTM D1646, ten pass 100 °C (212 °F) and 121 °C (250 °F)

ODR (vulcanization characteristics measured with an oscillating disk cure meter)

ASTM D2084

Property Change After Oven Heat-Aging

ASTM D573-88

Stress/Strain Properties
100% Modulus
Tensile Strength
Elongation at BreakASTM D412-87, pulled at 8.5 mm/sec (20 in/min)

Stiffness, Torsional, Clash-Berg

ASTM D1043-87

Temperature Retraction

ASTM D1329-88

Volume Change in Fluids

ASTM D471-79

Note: Test temperature is 24 °C (75 °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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