Silicone (VMQ) O-Rings & Silicone Gaskets | Seal & Design, Inc.

Silicone (VMQ) O-Rings & Silicone Gaskets

Silicone MaterialThe 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: Silicone, VMQ

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

Compound Info
ASTM D1418 Designation MQ, PMQ, VMQ, PVMQ
ASTM D2000/SAE J200 Type, Class FC, FE, GE
Hardness (Shore A) 20-80
Color red
Thermal Properties
Standard Min Temp. -75°F (-59°C)
Max Temp. 450°F (232°C)


Chemical Resistance
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
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.