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® OX 50 AEROSIL® R 106 AEROSIL® RX 50 AEROSIL® 200 AEROSIL® R 8200