Sold by Shin Etsu under the tradename KSP-100 series. Vinyl Dimethicone/Methicone Silsesquioxane Crosspolymer are powders. They are described by Shin Etsu as “white, spherical silicone composite powder consisting of spherical silicone rubber powder coated with silicone resin. With its properties of both silicone rubber and resin, KSP-100 series imparts a uniquely soft, silky feel and good dispersibility with reduced agglomeration.”
There are several grades of KSP powders, varying according to their average particle sizes, from 2 µm to 30 µm.