VDT 131 Trimethylsiloxy terminated vinylmethylsiloxane-dimethysiloxane copolymer 67762-94-1 Gelest Silicone (Si) ADHESIVE SEALANT Trimethylsiloxy terminated vinylmethylsiloxane-dimethysiloxane copolymer. Trimethylsiloxy terminated vinylmethylsiloxane-dimethysiloxane copolymer.