Potential Health Effects
Eye:
May cause eye irritation.
Skin:
May cause skin irritation.
Ingestion:
May cause irritation of the digestive tract.
Inhalation:
May cause respiratory tract irritation.
Chronic:
Not available.
**** SECTION 4 - FIRST AID MEASURES ****
Eyes:
Flush eyes with plenty of water for at least 15 minutes,
occasionally lifting the upper and lower eyelids. Get medical aid.
Skin:
Flush skin with plenty of water for at least 15 minutes while
removing contaminated clothing and shoes. Get medical aid if
irritation develops or persists. Wash clothing before reuse.
Ingestion:
Do not induce vomiting. If victim is conscious and alert, give 2-4
cupfuls of milk or water. Get medical aid.
Inhalation:
Remove from exposure and move 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.
Notes to Physician:
**** SECTION 5 - FIRE FIGHTING MEASURES ****
General Information:
As in any fire, wear a self-contained breathing apparatus in
pressure-demand, MSHA/NIOSH (approved or equivalent), and full
protective gear. Dusts at sufficient concentrations can form
explosive mixtures with air. Dousing metallic fires with water may
generate hydrogen gas, an extremely dangerous explosion hazard.
Extinguishing Media:
Use water spray, dry chemical, carbon dioxide, or chemical foam. Do
NOT get water inside containers.
**** SECTION 6 - ACCIDENTAL RELEASE MEASURES ****
General Information: Use proper personal protective equipment as indicated
in Section 8.
Spills/Leaks:
Vacuum or sweep up material and place into a suitable disposal
container. Very fine particles can cause a fire or explosion.
Eliminate all ignition sources. Clean up spills immediately,
observing precautions in the Protective Equipment section. Avoid
generating dusty conditions. Provide ventilation. Do not get water
inside containers.
**** SECTION 7 - HANDLING and STORAGE ****
Handling:
Minimize dust generation and accumulation. Avoid contact with skin
and eyes. Avoid ingestion and inhalation. Do not allow contact with
water. Use only in a chemical fume hood. Keep from contact with moist
air and steam.
Storage:
Store in a tightly closed container. Store in a cool, dry,
well-ventilated area away from incompatible substances. Store
protected from moisture.
**** SECTION 8 - EXPOSURE CONTROLS, PERSONAL PROTECTION ****
Engineering Controls:
Good general ventilation should be sufficient to control airborne
levels. Facilities storing or utilizing this material should be
equipped with an eyewash facility and a safety shower.
Exposure Limits
CAS# 7440-21-3:
United Kingdom, WEL - TWA: (listed as silica, amorphous): 6 mg/m3
(inhalable dust); 2.4 mg/m3 TWA (respirable dust)
United Kingdom, WEL - STEL: 30 ppm STEL (inhalable dust); 12 mg/m
STEL (respirable dust)
United States OSHA: 15 mg/m3 TWA (total dust); 5 mg/m3 TWA
(respirable fraction)
Belgium - TWA: 10 mg/m3 VLE
France - VME: 10 mg/m3 VME
Netherlands: 10 mg/m3 MAC
Russia: (listed as silica, amorphous): 1 mg/m3 TWA
Spain: 10 mg/m3 VLA-ED (inhalable fraction); 4 mg/m3 VLA-ED
(respirable fraction)
Personal Protective Equipment
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 to prevent skin
exposure.
Clothing:
Wear a chemical apron. Wear appropriate protective
clothing to prevent skin exposure.
Respirators:
A NIOSH/MSHA approved air purifying dust or mist
respirator or European Standard EN 149.
**** SECTION 9 - PHYSICAL AND CHEMICAL PROPERTIES ****
Physical State: Solid
Color: silver-gray
Odor: Not available.
pH: Not available.
Vapor Pressure: Not available.
Viscosity: Not available.
Boiling Point: 2355 deg C
Freezing/Melting Point: 1410 deg C
Autoignition Temperature: Not applicable.
Flash Point: Not applicable.
Explosion Limits, lower: Not available.
Explosion Limits, upper: Not available.
Decomposition Temperature: Not available.
Solubility in water: Insoluble in water.
Specific Gravity/Density: Not available.
Molecular Formula: Si
Molecular Weight: 28.0855
**** SECTION 10 - STABILITY AND REACTIVITY ****
Chemical Stability:
Stable under normal temperatures and pressures.
Conditions to Avoid:
Incompatible materials, dust generation, moisture, excess heat.
Incompatibilities with Other Materials:
Moisture, strong oxidizing agents.
Hazardous Decomposition Products:
Irritating and toxic fumes and gases, oxides of silicon.
Hazardous Polymerization: Has not been reported.
**** SECTION 11 - TOXICOLOGICAL INFORMATION ****
RTECS#:
CAS# 7440-21-3: VW0400000
LD50/LC50:
CAS# 7440-21-3: Draize test, rabbit, eye: 3 mg Mild; Oral, rat: LD50
= 3160 mg/kg.
Carcinogenicity:
Silicon -
Not listed by ACGIH, IARC, or NTP.
Other:
See actual entry in RTECS for complete information.
**** SECTION 12 - ECOLOGICAL INFORMATION ****
**** SECTION 13 - DISPOSAL CONSIDERATIONS ****
Dispose of in a manner consistent with federal, state, and local regulations.
**** SECTION 14 - TRANSPORT INFORMATION ****
IATA
Not regulated as a hazardous material.
IMO
Not regulated as a hazardous material.
RID/ADR
Not regulated as a hazardous material.
**** SECTION 15 - REGULATORY INFORMATION ****
European/International Regulations
European Labeling in Accordance with EC Directives
Hazard Symbols: Not available.
Risk Phrases:
Safety Phrases:
WGK (Water Danger/Protection)
CAS# 7440-21-3: No information available.
Canada
CAS# 7440-21-3 is listed on Canada's DSL List.
CAS# 7440-21-3 is not listed on Canada's Ingredient Disclosure List.
US FEDERAL
TSCA
CAS# 7440-21-3 is listed on the TSCA inventory.
The information above is believed to be accurate and represents the best
information currently available to us. However, we make no warranty of
merchantability or any other warranty, express or implied, with respect to
such information, and we assume no liability resulting from its use. Users
should make their own investigations to determine the suitability of the
information for their particular purposes. In no way shall the company be
liable for any claims, losses, or damages of any third party or for lost
profits or any special, indirect, incidental, consequential or exemplary
damages, howsoever arising, even if the company has been advised of
the possibility of such damages.
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