EVONIK CORPORATION › AEROSIL® R 208 AEROSIL® R 208 $0.00 AEROSIL® R 208 is a fumed silica after treated with polydimethylsiloxane. Quantity: Add To Cart Added! AEROSIL® R 208 is a fumed silica after treated with polydimethylsiloxane. You Might Also Like AEROSIL® 200 VS AEROSIL® 300 AEROSIL® 130 AEROSIL® R 974 AEROSIL® 150