Sipernat 880 Calcium silicate 1344-95-2 Degussa Extenders / Fillers >> Calcium silicate Rheology Modifiers / Thickeners >> Mineral >> Synthetic Silica Chloroprene Rubber (CR) ADHESIVE Sipernat 880 is a fine particle calcium silicate with a calcium calcium silicate Synthetic precipitated calcium silicate. Used as auxiliary in polychloroprene adhesives.