The chemical compound Silicon Dioxide, also known as silica (from the Latin silex), is an oxide of silicon with the chemical formula SiO2. It has been known for its hardness since ancient times. Silica is most commonly found in nature as sand or quartz, as well as in the cell walls of diatoms.
Specification
| Item | Standard |
| Appearance | 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 | Negative |
| Escherichia coli/ 5g | Negative |
CAS NO.
7631-86-9
Name
Silicon dioxide
Alias
Silica
Formula
SiO2
Formula weight
60.08
Density
2.6
Water solubility
insoluble
Melting point
1610 ºC
Hazard Symbols
Xi
Safety Description
S26;S37/39
Risk Codes
R36/37
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