VDT 431 Trimethylsiloxy terminated vinylmethylsiloxane-dimethysiloxane copolymer 67762-94-1 Gelest Silicone Coatings Insoluble in water Trimethylsiloxy terminated vinylmethylsiloxane-dimethysiloxane copolymer. Used in coatings. Trimethylsiloxy terminated vinylmethylsiloxane-dimethysiloxane copolymer. Used in coatings.