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Silicon dioxide 7631-86-9


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  • 7631-86-9

  • bosschemical

  • 7631-86-9

Silicon dioxide Basic information
Product Name: Silicon dioxide
CAS: 7631-86-9
MF: O2Si
MW: 60.08
EINECS: 231-545-4
Mol File: 7631-86-9.mol
Silicon dioxide Chemical Properties
Melting point >1600 °C(lit.)
Boiling point >100 °C(lit.)
density 2.2-2.6 g/mL at 25 °C
refractive index 1.46
Fp 2230°C
storage temp. Refrigerator (+4°C)
solubility Practically insoluble in water and in mineral acids except hydrofluoric acid. It dissolves in hot solutions of alkali hydroxides.
form suspension
color White to yellow
Specific Gravity 2.2
Specific Gravity 0.97
Specific Gravity 1.29
PH 5-8 (100g/l, H2O, 20℃)(slurry)
Water Solubility insoluble
Sensitive Hygroscopic
Hydrolytic Sensitivity 6: forms irreversible hydrate
Hydrolytic Sensitivity 5: forms reversible hydrate
Hydrolytic Sensitivity 4: no reaction with water under neutral conditions
Merck 148,493
Stability: Stable.
CAS DataBase Reference 7631-86-9(CAS DataBase Reference)
IARC 3 (Vol. Sup 7, 68) 1997
NIST Chemistry Reference Silicon(iv) oxide(7631-86-9)
EPA Substance Registry System Silica (7631-86-9)


Items Specification Results
Specific surface area 176-225m2/g 205m2/g
PH value in aqueous dispersion 3.7-4.5 4.14
Loss on drying at 105℃ ≤2.0% 0.53%
Ignition loss at 1000℃ ≤2.5% 0.53%
45μm sieve residue ≤0.025% 0.02%
Tamped density 30-60g/L 46
SiO2 ≥99.8% 99.87%
Carbon content ≤0.2% 0.03%



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