Poly(methylphenylsiloxane)

polymer

Poly(methylphenylsiloxane) is a siloxane-based polymer featuring alternating silicon-oxygen backbone chains with methyl and phenyl organic substituents, combining properties of both silicone elastomers and rigid engineering polymers. This material is used in high-temperature applications, electrical insulation systems, and specialized coatings where thermal stability and chemical resistance are critical—particularly in aerospace, electronics, and demanding industrial environments where conventional organic polymers degrade. The phenyl groups enhance thermal and oxidative resistance compared to purely methyl-substituted siloxanes, making it valuable for components that experience sustained elevated temperatures or harsh chemical exposure.

high-temperature electrical insulationaerospace coatings and sealantsthermal management componentschemical-resistant elastomerselectronics potting and encapsulationindustrial seals and gaskets

Compliance & Regulations

?UL 94?Conflict Free?RoHS?REACH?TSCA?Prop 65
Units:
siimperial
PropertyValueUnitConditionsSource
Glass Transition Temperature(Tg)
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°F——
Verified Unverified Low confidence (<80%) Link to source

Regulatory Screening

Environmental

Safety & Biocompatibility

RoHS, REACH, and Prop 65 statuses are validated against official substance lists (ECHA SVHC Candidate List, OEHHA Prop 65, RoHS Annex II). Other regulations are estimated from composition and material classification. All screening is a starting point for due diligence — always verify with your supplier before making compliance decisions.