EVONIK CORPORATION › AEROSIL® R 812 S AEROSIL® R 812 S $0.00 AEROSIL® R 812 S is a fumed silica after treated with HMDS. Quantity: Add To Cart Added! AEROSIL® R 812 S is a fumed silica after treated with HMDS. You Might Also Like AEROSIL® RX 200 AEROSIL® R 202 AEROSIL® RA 200 HS AEROSIL® 200 F AEROSIL® R 106