EVONIK CORPORATION › AERODISP® W 7520 AERODISP® W 7520 $0.00 AERODISP® W 7520 is a 20% dispersion of hydrophilic AEROSIL® fumed silica with slightly alkaline pH value. Quantity: Add To Cart Added! AERODISP® W 7520 is a 20% dispersion of hydrophilic AEROSIL® fumed silica with slightly alkaline pH value. You Might Also Like AERODISP® W 1714 AERODISP® W 7622 AERODISP® W 7512 S AERODISP® WK 341