Test item	standard	Test result
whiteness	>90%	96.6%
SiO2 Content	≥90%	91.53%
Heating loss	1.4.0%-7.0%	5.97%
LOILossonignition(LOI)	1.3.0%-6.0%	5.44%
PH	6.0-7.5	7.16
BET/surface area m2/g	145-180	172
DBPabsorption value ,cm3/g	2.3-2.8	2.75