... 4,6,6,8,8-Octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasiloxane1. Properties:Chemical Name: Octamethylcyclotetrasiloxane(D4) CAS No.: ... 556-67-2EINECS No.:209-136-7Formula: ... Appearance:Colorless clear oily liquid2. Applications:D4, Octamethylcyclotetrasiloxane, CAS No.: 556-67-2 is a base fluid in a ...