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® 300 V AEROSIL® 200 HV AEROSIL® R 7200 AEROSIL® 200 V AEROSIL® 380