PVMQ - Phenyl Silicone

Clwyd reference PVMQ
ASTM classification PVMQ

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 Bracket Low
ASTM 1 Oil Average
ASTM 2 Oil Average
ASTM 3 Oil Average
Kerosene None
Liquid B None
Liquid 101 None
Phosphate ester None
Ketone None
Toluene None
Iso-octane None
Methanol Excellent
Acid (weak) None
Acid (strong) None
Base (weak) Average
Base (strong) None
Hydrogen sulphide Average
Steam Average
Ozone Excellent
Radiation Average
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