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Basic elastomers for O-Rings

The following paragraph briefly reviews various elastomers currently available for use in O-Rings and other seals.

 VMQ (Silicone Rubber)

Silicone rubbers have a backbone that consists of alternating silicon and oxygen atoms (-Si-O-Si-).This is unusual compared to other elastomers which have an organic backbone (-C-C-). Silicone rubber shows excellent heat resistance, cold flexibility, dielectric properties and especially good resistance to oxygen and ozone. Silicone has a high physiological inertness, it is odourless, tasteless and non-toxic. The mechanical properties, however, are poor to moderate. The material should only be used in static applications. Depending on the material the operating temperatures range between -60°C and +200°C (and for a short period of time even up to +230°C).

VMQ is resistant to:

• Engine and transmission oil (for example 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, ageing and weather

VMQ is 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)