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 972 V AEROSIL® 300 V AEROSIL® R 805 AEROSIL® TT 600 AEROSIL® R 972