Methylphenylsilicone plastic

Silicone sealants of this type are available as colorless (translucent) compositions if desired. Silicone polymer content is in the 60-70% range (40-50% polysiloxane plus up to 20% dimethyl silicone or methylphenylsilicone plasticizer). Pigments and fillers include titanium dioxide, silicas, calcium carbonate, or dried clays. Pyrogenic silicas are used for rheological control to produce nonslump sealants. 

Methylphenylsilicones Silicone rubbers containing pendant phenyl and methyl groups. Has good resistance to heat, oxidation, and radiation, and compatibility with plastics. 

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