SAS Type Internal Code Fumed Silica F-3 Precipitated Silica P-2 Silica Gel G-1 Colloidal Silica C-1 BET 1 (m2/g) 300 440 700 200 2 solid content for suspensions (wt.-%) - - - 40 pH 3 electric conductivity (µS/cm) at 25 ◦C 5 4 6.5 4.4 9.7 160 55 4771.6 1 BET: ...