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 711 AEROSIL® OX 50 AEROSIL® 150 AEROSIL® 200 VS AEROSIL® R 972