Heptamethyltrisiloxane 7-methyl-3-siloxane CAS No.: 1873-88-7 EINECS : 217-496-1 M.F. : C7H22O2Si3 Heptamethyltrisiloxane 7-methy-3-siloxane 1. Chemical ... Name:1,1,1,3,5,5,5-7-methyl-3 siloxane, HMTS2. Molecular formula : C7H22O2Si3 ... be sealed and kept in cool & ventilated place. 7-methy-3-siloxane