Silicone Rubber (Q, MQ, VMQ, PVMQ)
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. Silicones have
good heat resistance up to 232°C (450°F), good cold
flexibility down to -59°C (-75°F) and good ozone and
weather resistance as well as good insulating and physiologically
neutral properties.
Heat resistance
• Up to approximately 204°C (400°F) (special compounds
up to 232°C (450°F).
Cold flexibility
• Down to approximately -59°C to -54°C (-75°F to
-65°F) with special compounds down to -115°C
(-175°F).
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 with:
• Superheated water steam over 121°C (250°F).
• Acids and alkalis.
• Low molecular weight chlorinated hydrocarbons
(trichloroethylene).
• Aromatic mineral oil.
• Hydrocarbon based fuels.
• Aromatic hydrocarbons (benzene, toluene).
