Silicon dioxide (vitreous)

  • Fused silica
Formula
SiO2
Description
Colorless, odorless solid.
Uses
Vitreous or fused silica is used as laboratory glassware in chemical laboratories and in the semiconductor industry; thin-film dielectric coating in integrated circuits; electric-resistance furnaces and radiant heaters, and protection of precious-metal themocouples; as a refractive optical material, used for prisms, camera lenses, cells, solar cell covers, spacecraft windows, and other optical components; in mirror blanks of astronomical telescopes; as a component of laser optics; as an envelope material for mercury-vapour and incandescent tungsten-halogen cycle lamps; as a chromatography substitute, inert filler or as a coating material in the investment-cast industry; insulation or packing material

Registry Numbers and Inventories.
CAS
60676-86-0
EC (EINECS/ELINCS)
262-373-8
RTECS
VV7328000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen
Beilstein/Gmelin
9357 (G)
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
O2Si
Formula mass
60.08
Melting point, °C
1710
Boiling point, °C
2230
Density
2.196 g/cm3 (20 C)
Solubility in water
Insoluble
Thermal expansion
5.366E-05/K

Hazards and Protection.
Storage
Store in a cool, dry place. Keep container closed when not in use.
D2B
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to minimize contact with skin.
Respirators
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use. Wear a NIOSH/MSHA or European Standard EN 149 approved full-facepiece airline respirator in the positive pressure mode with emergency escape provisions.
Small spills/leaks
Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong acids - moisture.
Decomposition
Irritating and toxic fumes and gases, silicon oxide.

Fire.
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Extinguishing media: Substance is noncombustible; use agent most appropriate to extinguish surrounding fire. Use agent most appropriate to extinguish fire.

Health.
Poison_Class
F (Not subject to toxicity classification)
Exposure effects
Chronic inhalation of dust may lead to silicosis.
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea.
   Inhalation
May cause respiratory tract irritation. May cause lung damage. Contains crystalline silica which may lead to respiratory abnormalities and silicosis.
   Skin
May cause skin irritation.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
   Inhalation
Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Transport.
HS Code
2811 22 00