Item	Index
Main content of silica                       % min	90
Evaporation loss% 105,2 ?	4.0 - 8.0
LOI% 1000,2 ?	3.0 - 6.0
PH Value	6.5-7.5
BET surface area m2 / g	200-260
Oil cm3/g-	2.8-3.5
Total iron mg/kg	500 Maximum