EVONIK CORPORATION › AEROSIL® R 812 S AEROSIL® R 812 S $0.00 AEROSIL® R 812 S is a fumed silica after treated with HMDS. Add To Cart Added! AEROSIL® R 812 S is a fumed silica after treated with HMDS. You Might Also Like AEROSIL® 130 AEROSIL® RA 200 HS AEROSIL® R 7200 AEROSIL® 200 HV AEROSIL® 200 VS