EVONIK CORPORATION › AEROSIL® R 208 AEROSIL® R 208 $0.00 AEROSIL® R 208 is a fumed silica after treated with polydimethylsiloxane. Add To Cart Added! AEROSIL® R 208 is a fumed silica after treated with polydimethylsiloxane. You Might Also Like AEROSIL® R 805 AEROSIL® 200 F AEROSIL® 380 AEROSIL® 200 VS AEROSIL® 150