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Silicone (Q, MQ, VMQ, PVMQ)

Silicones have good ozone and weather resistance as well as good insulating and physiologically neutral properties. However, silicone elastomers as a group, have relatively low tensile strength, poor tear strength and little wear resistance.

Heat resistance

• Up to approximately 204°C (400°F) special compounds up to 260°C (500°F)


Cold flexibility

• Down to approximately -54°C (-65°F) special compounds down to -115°C (-175°F)


Chemical resistance

• Animal and vegetable oil and grease

• High molecular weight chlorinated aromatic hydrocarbons (including flame-resistant insulators, and coolant for transformers)

• Moderate water resistance

• Diluted salt solutions

• Ozone, aging and weather


Not compatible with:

• Superheated water steam over 121°C (250°F)

• Acids and alkalis

• Low molecular weight chlorinated hydrocarbons


• Hydrocarbon based fuels

• Aromatic hydrocarbons (benzene, toluene)

• Low molecular weight silicone oils

Parker Hannifin
O-Ring & Engineered Seals
2360 Palumbo Drive
Lexington, KY 40509
Ph: 859-269-2351
Fax: 859-335-5128