Silicon Dioxide 7631 - 86 - 9

Boiling point

>100 °C(lit.)

bulk density

200-800kg/m3

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.

pka

6.65-9.8[at 20 ℃]

form

suspension

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

Sensitive

Hygroscopic

Hydrolytic Sensitivity

6: forms irreversible hydrate

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)

IARC

3 (Vol. Sup 7, 68) 1997

NIST Chemistry Reference

Silicon(iv) oxide(7631-86-9)

EPA Substance Registry System

Silica (7631-86-9)