The term silicone covers a large group of materials in which vinyl-methyl-silicone (VMQ) is often the central ingredient. Silicone elastomers as a group have relatively low tensile strength, poor tear and wear resistance. However, they have many useful properties as well. Silicone materials have good heat resistance and good cold flexibility. They also have good ozone and weather resistance as well as good insulating and physiologically neutral properties.

Names: SiliconeVMQ

Both o-rings and gaskets can be made from silicone materials.


Compound Info

ASTM D1418 DesignationMQ, PMQ, VMQ, PVMQ
ASTM D2000/SAE J200 Type, ClassFC, FE, GE
Hardness (Shore A)20-80

Thermal Properties

Standard Min Temp.-75°F (-59°C)
Max Temp.450°F (232°C)

Chemical Resistance

Engine and transmission oil (e.g. ASTM oil No.1)
Animal and vegetable oil and grease
Brake fluid (non-petroleum base)
Fire-resistant hydraulic fluid, HFD-R and HFD-S
High molecular weight chlorinated aromatic hydrocarbons (including flame-resistant insulators, and coolant for transformers)
Moderate water resistance
Diluted salt solutions
Ozone, aging, and weather resistant

NOT Compatible

Superheated water / steam over 250°F(121°C)
Acids and alkalis
Low molecular weight chlorinated hydrocarbons (trichloroethylene)
Aromatic mineral oil
Hydrocarbon based fuels
Aromatic hydrocarbons (benzene, toluene)

Disclaimer: These are general guidelines only. All materials should be tested in your application.