EVONIK CORPORATION › AEROSIL® R 812 AEROSIL® R 812 $0.00 AEROSIL® R 812 is a fumed silica after treated with organo-silane (HDMDS) with high specific surface and marked hydrophobia. Add To Cart Added! AEROSIL® R 812 is a fumed silica after treated with organo-silane (HDMDS) with high specific surface and marked hydrophobia. You Might Also Like AEROSIL® TT 600 AEROSIL® R 208 AEROSIL® R 972 V AEROSIL® 130 AEROSIL® 300 V