EVONIK CORPORATION › AEROSIL® R 202 AEROSIL® R 202 $0.00 AEROSIL® R 202 is a fumed silica after treated with polydimethylsiloxane. Add To Cart Added! AEROSIL® R 202 is a fumed silica after treated with polydimethylsiloxane. You Might Also Like AEROSIL® R 812 S AEROSIL® R 805 AEROSIL® 200 V AEROSIL® 200 AEROSIL® 200 VS