Property

Value

Appearance Free-flowing powder from white to light grey colour without strange dissemination
Mass part of silicon dioxide, SiO2 wt%, min. 99,0-99,3
рН of suspension, min. ≥ 3,9
Loss on heating, (2 hrs at 105 0С), wt.%, max. < 0,5
Loss on calcination, (2 hrs at 1000 0С), wt.%, max. ≤ 2
Molal concentration of methyl-silyl groups, mmol/gr, min. 0,3
Molal concentration of hydroxyl groups, mmol/gr. 0,05
Mass part of moisture, %, max 0,6
Bulk density, g/dm3
   noncompacted 35-60
   compacted 70-100
Specific surface, m2/gr by BET method 120 ± 20
Hydrophobicity % >99,0