PDV 2331 Vinyl terminated diphenylsiloxane-dimethylsiloxane copolymer 68951-96-2 Gelest Silicone (Si) >> Vinyl SEALANT ADHESIVE Vinyl terminated diphenylsiloxane-dimethylsiloxane copolymer. Offers special thermal or optical properties. Vinyl terminated diphenylsiloxane-dimethylsiloxane copolymer. Offers special thermal or optical properties.