PVMQ - Phenyl Silicone

Clwyd referencePVMQ
ASTM classificationPVMQ

Phenyl silicone – or methyl phenyl silicone – is a polydimethylsiloxane with phenyl groups. The phenyl content improves various properties such as oxidation resistance, thermal stability, shear resistance and optical clarity.

Typical applications

Typical applications for use with connectors for cables and sealing for automotive and aerospace markets where ultra low temp is required.

Advantages

The most prominent characteristic is flexibility at extreme temperatures, with operational ranges between -90 °F to +500 °F. Also, by blending phenyl silicone with silicone and  fluorosilicone elastomers, we can optimise properties of the overall material.

Disadvantages

Poor impermeability to gas, not resistant to hydrocarbon-based fuels, aromatic hydrocarbons (benzene, toluene), low molecular weight silicone oils, strong acids and alkalis. It is regarded as mechanically weak.

Available hardness range (Shore A)50 - 85
Upper continuous service temp.225°C
Min. temp. for sealing applications-70°C
Minimum non-brittle  temp. -80°C
Tensile strength (up to)8 MPa
Elongation at break (up to)500%
Price BracketLow
ASTM 1 OilAverage
ASTM 2 OilAverage
ASTM 3 OilAverage
KeroseneNone
Liquid BNone
Liquid 101None
Phosphate esterNone
KetoneNone
TolueneNone
Iso-octaneNone
MethanolExcellent
Acid (weak)None
Acid (strong)None
Base (weak)Average
Base (strong)None
Hydrogen sulphideAverage
SteamAverage
OzoneExcellent
RadiationAverage
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