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CAS Number: 7440-21-3
Product Catalog

14-0700
Silicon › Silicon powder (99.999%)
CAS Number: 7440-21-3
MDL Number: MFCD00085311
Molecular Formula: Si
Molecular Weight: 28.09
Chemical Formula: Si
Color and Form: -325 mesh
Note:  

Safety: Hazardous

Physical Characteristics: melting point 1420°C, boiling point 2600°C, density 2.42

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SECTION 1: Product Identification
Chemical Name: Silicon powder (99.999%)
Product Number: 14-0700
CAS Registry Number: 7440-21-3
Formula: Si
EINECS Number: 231-130-8
Chemical Family: metal or element
Synonym: Polycrystalline silicon
SECTION 2: Composition and Information on Ingredients
Ingredient CAS Number Percent ACGIH (TWA) OSHA (PEL)
Title Compound 7440-21-3 100 10mg/m3 15mg/m3
SECTION 3: Hazards Identification
Emergency Overview: Dust is irritating to skin, eyes and respiratory tract.
Primary Routes of Exposure: Ingestion, inhalation.
Eye Contact: Causes slight to mild irritation of the eyes.
Skin Contact: Causes slight to mild irritation of the skin.
Inhalation: Inhalation of fine dust is irritating to the nasal cavity, mucous membranes and respiratory tract.
Ingestion: No specific information on the physiological effects of ingestion.
Acute Health Effects: Dust is irritating to skin, eyes and respiratory tract.
Chronic Health Effects: No information available on long-term exposure to this material.
NTP: No
IARC: No
OSHA: No
SECTION 4: First Aid Measures
Eye Exposure: Immediately flush the eyes with copious amounts of water for at least 10-15 minutes. A victim may need assistance in keeping their eye lids open. Get immediate medical attention.
Skin Exposure: Wash the affected area with water. Remove contaminated clothes if necessary. Seek medical assistance if irritation persists.
Inhalation: Remove the victim to fresh air. Closely monitor the victim for signs of respiratory problems, such as difficulty in breathing, coughing, wheezing, or pain. In such cases seek immediate medical assistance.
Ingestion: Seek medical attention immediately. Keep the victim calm. Give the victim water (only if conscious). Induce vomiting only if directed by medical personnel.
SECTION 5: Fire Fighting Measures
Flash Point: not applicable
Autoignition Temperature: no data
Explosion Limits: no data
Extinguishing Medium: Dry chemical or Class D metal fire agent, salt or sand.
Special Fire Fighting Procedures: If this product is involved in a fire, fire fighters should be equipped with a NIOSH approved positive pressure self-contained breathing apparatus.
Hazardous Combustion and Decomposion Products: If involved in a fire, burning silicon may produce mildly irritating fumes of silica.
Unusual Fire or Explosion Hazards: Flammable solid. Dust may form explosive mixtures with air under some conditions.
SECTION 6: Accidental Release Measures
Spill and Leak Procedures: In the case of a spill, the fine powder should be covered with sodium carbonate or dolomite in order to reduce the formation of airborne dust. Avoid static discharge. Sweep up the mixture.
SECTION 7: Handling and Storage
Handling and Storage: Store in a tightly sealed container.
SECTION 8: Exposure Controls and Personal Protection
Eye Protection: Always wear approved safety glasses when handling a chemical substance in the laboratory.
Skin Protection: Wear protective clothing and gloves.
Ventilation: Material is a fine dust. If possible, handle the material in an efficient fume hood.
Respirator: If ventilation is not available a respirator should be worn. The use of respirators requires a Respirator Protection Program to be in compliance with 29 CFR 1910.134.
Additional Protection: No additional protection required.
SECTION 9: Physical and Chemical Properties
Color and Form: -325 mesh
Molecular Weight: 28.09
Melting Point: 1420°C
Boiling Point: 2600°C
Vapor Pressure: 1mm (1724 °C)
Specific Gravity: 2.42
Odor: none
Solubility in Water: insoluble
SECTION 10: Stability and Reactivity
Stability: air and moisture stable
Hazardous Polymerization: no hazardous polymerization
Conditions to Avoid: Mixtures of fine dust with air. Contact with an ignition source.
Incompatibility: Halogens, strong oxidizing agents, Nitric acid plus Hydrofluoric acid.
Decomposition Products: none
SECTION 11: Toxicological Information
RTECS Data: Administration into the eye (rabbit); Standard Draize test: 3 mg. Oral (rat); LD50: 3160 mg/kg. Intraperitoneal (rat); LDLo: 500 mg/kg.
Carcinogenic Effects: No data available
Mutagenic Effects: No data available
Tetratogenic Effects: No data available
SECTION 12: Ecological Information
Ecological Information: No information available
SECTION 13: Disposal Considerations
Disposal: Dispose of according to local, state and federal regulations.
SECTION 14: Transportation
Shipping Name (CFR): Silicon powder, amorphous
Hazard Class (CFR): 4.1
Additional Hazard Class (CFR): NA
Packaging Group (CFR): III
UN ID Number (CFR): UN# 1346
Shipping Name (IATA): Silicon powder, amorphous
Hazard Class (IATA): 4.1
Additional Hazard Class (IATA): NA
Packaging Group (IATA): III
UN ID Number (IATA): UN# 1346
SECTION 15: Regulatory Information
TSCA: Listed in the TSCA inventory
SARA (Title 313): Title compound not listed
Second Ingredient: none
Third Ingredient: none
SECTION 16: Other Information
Disclaimer: The information herein is believed to be accurate and reliable as of the date compiled. However, Strem Chemicals, Inc. makes no representation, warranty, or guarantee of any kind with respect to the information contained in this document or any use of the product based on this information.
Preparation Date: 12/01/2000
Revision Date: 8/03/2011

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