| 外观 | White powder |
| Purity (SiO2, %) | >= 96 |
| Oil absorption (cm3/g) | 2.0~ 3.0 |
| Loss on drying (%) | 4.0~ 8.0 |
| Loss on ignition (%) | =<8.5 |
| BET (m2/g) | 170~ 240 |
| pH (10% solution) | 5.0~ 8.0 |
| Sodium sulfate (as Na2SO4, %) | =<1.0 |
| Arsenic (As) | =< 3mg/kg |
| Lead (Pb) | =< 5 mg/kg |
| Cadium (Cd) | =< 1 mg/kg |
| Mercury (Hg) | =< 1 mg/kg |
| Total heavy metals (as Pb) | =< 20 mg/kg |
| Total plate count | =<500cfu/g |
| Salmonella spp./ 10g | 阴性 |
| Escherichia coli/ 5g | 阴性 |
二氧化硅
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