VMQ – Silicone Rubber
Vinyl Methyl Silicone

Properties

Silicone elastomers are ideal for high and low temperature applications. They have high heat and oxidative stability, outstanding low temperature flexibility, and are resistant to many chemicals, weathering, ozone and sunlight (UV). However, they are not resistant to super-heated steam, and their physical properties are generally low but are usually retained at higher temperatures. They also have poor gas permeability and low resistance to mineral oils and hydrocarbon solvents.

 

 

COMMERCIAL VMQ Elastomers

Important manufacturers and suppliers of VMQ rubbers are Eriks, Wacker, Eastern Seals, and BlueStars.

 

Applications

Silicone rubbers are rather expensive in comparison to most other elastomers and are, therefore, only used when excellent resistance to chemicals, oxygen, weathering and/or flexibility at (very) low temperatures is required. They are also used when food/bio compatibility is required.

Silicone rubbers are widely used in the pharmaceutical, medical, electrical, automotive and aerospace industry. Typical applications include surgical implants, wound dressings, mold making, wire and cable insulations, gaskets, seals, and tubings. Silicone elastomers are also used in pressure sensitive adhesives.

The typical working temperature range is -60°C to +250°C. However, special grades will withstand temperatures up to 300°C.

Main Properties

Temp. Range, °C -60 / 250
Compression Set Good
Strength Properties Fair
Low Temp. Prop. Excellent
Abrasion Resist. Poor
Gas Permeability Poor
Weather Resist. Excellent
Water Resistance Fair
Ozone Resistance Excellent
Mineral Oil Resist. Poor-Fair
Chemical Resist. Fair-Good
Flame Resistance Good
Heat Resistance Excellent

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