Silicon dioxide

  • Acticel
  • Aerogel 200
  • Aerosil
  • Aerosil a 300
  • Aerosil e 300
  • Aerosil k 7
Formula
SiO2
Description
Transparent crystals or amorphous powder. Odorless.
Uses
Manufacture glass, water glass, refractories, abrasives, ceramics, enamels, in scouring-& grinding-compd, ferrosilicon, molds for castings, decolorizing & purifying oils, petroleum products, etc.

Registry Numbers and Inventories.
CAS
7631-86-9
EC (EINECS/ELINCS)
231-545-4
R 40 37
S 22 36/37
RTECS
VV7565000
RTECS class
Other
Merck
12,8637
Beilstein/Gmelin
9357 (G)
EPA OPP
72605
Swiss Giftliste 1
G-8311
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
60.09
Melting point, °C
1719
Boiling point, °C
2230
Density
2.2 g/cm3 (20 C)
Solubility in water
Insoluble
Surface tension
52.0 g/s2 at 298 K
Refractive index
1.193
Thermal expansion
0.000054/K

Hazards and Protection.
Storage
Keep container closed when not in use. Store in a cool, dry, well-ventilated area away from incompatible substances. Store protected from moisture.
Handling
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Use with adequate ventilation. Minimize dust generation and accumulation. 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 protective gloves and clothing to prevent skin exposure. Clothing: Wear appropriate protective clothing to minimize contact with skin.
Respirators
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.
Disposal code
14
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Magnesium.
Decomposition
Irritating and toxic fumes and gases.

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: Use agent most appropriate to extinguish fire. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam.
Fire potential
Nonflammable.
Health
1
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure limit(s)
IDHL: 3000 mg/m3
Carcinogin
I-2A, N-1, CP65
Poison_Class
-
Exposure effects
Prolonged exposure to respirable crystalline quartz may cause delayed lung injury/fibrosis (silicosis).
   Ingestion
May cause digestive tract disturbances.
   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
Never give anything by mouth to an unconscious person. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid if cough or other symptoms appear.
   Skin
Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid if irritation develops or persists. Wash clothing before reuse.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. If irritation develops, get medical aid.

Transport.
HS Code
2811 22 00