Silicon dioxide CAS#7631-86-9
Silicon dioxide CAS#7631-86-9 - Image 2
Silicon dioxide CAS#7631-86-9 - Image 3
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Silicon dioxide CAS#7631-86-9

Silicon dioxide, commonly known as silica, is a naturally occurring compound found in quartz and sand. It is a primary component of most rocks and is widely used in various industries due to its high thermal stability, chemical inertness, and optical clarity. In chemical applications, it is valued for its abrasive, refractory, and adsorptive properties, making it essential in products like glass, ceramics, and electronics.

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Silicon dioxide CAS#7631-86-9

Silicon dioxide Chemical Properties
Melting point >1600 °C(lit.)
Boiling point >100 °C(lit.)
density 2.2-2.6 g/mL at 25 °C
vapor pressure 13.3hPa at 1732℃
refractive index 1.46
Fp 2230°C
storage temp. 2-8°C
solubility Practically insoluble in water and in mineral acids except hydrofluoric acid. It dissolves in hot solutions of alkali hydroxides.
form suspension
pka 6.65-9.8[at 20 ℃]
Specific Gravity 2.2
color White to yellow
PH 5-8 (100g/l, H2O, 20℃)(slurry)
Odor at 100.00?%. odorless
Resistivity 1∞10*20 (ρ/μΩ.cm)
Water Solubility insoluble
Hydrolytic Sensitivity 6: forms irreversible hydrate
Sensitive Hygroscopic
Crystal Structure Trigonal
Merck 14,8493
Exposure limits NIOSH: IDLH 3000 mg/m3; TWA 6 mg/m3
Stability: Stable.
CAS DataBase Reference 7631-86-9(CAS DataBase Reference)
NIST Chemistry Reference Silicon(iv) oxide(7631-86-9)
IARC 3 (Vol. Sup 7, 68) 1997
EPA Substance Registry System Silica (7631-86-9)
Safety Information
Hazard Codes Xn,Xi
Risk Statements 36/37/38-36/37-22-43-52/53-36/38
Safety Statements 26-37/39-36-36/37/39-36/37-61
OEB B
OEL TWA: 6 mg/m3
HS Code 2811221000
Toxicity LC inhalation in rat: > 200gm/m3/1H
IDLA 3,000 mg/m3

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