Silicon
Synonyms: Silicon powder, Elemental silicon
SECTION 1: Identification of the substance/mixture and of the company/undertaking
Chemical Name
Silicon
Product Form
Substance
Catalogue No.
AL3996
CAS Number
7440-21-3
EC Number
231-130-8
EC Index Number
-
Grade
98.5% Extra Pure
HSN Code
28046900
Molecular Formula
Si
SECTION 1: Identification of the substance/mixture and of the company/undertaking
1.1 Product identifier
Chemical Name
Silicon
Catalogue No.
AL3996
Product form
Substance
CAS Number
7440-21-3
EC Number
231-130-8
Grade
98.5% Extra Pure
EC Index Number
Not specified
Chemical Formula
Si
HSN Code
28046900
Synonyms
Silicon powder, Elemental silicon
Chemical Structure
-
1.2 Relevant identified uses of the substance or mixture and uses advised against
Use of the substance/mixture
Raw material for semiconductor and solar industries
Uses advised against
Not specified
1.3 Details of the supplier of the safety data sheet
Company identification
Address:- 102, B wing, Savgan Heights, RTO Lane,Andheri (W), Mumbai-400 053Maharashtra, India.
1.4 Emergency Contact Details
Phone / e-Mail
Phone : +91 22 26317055 Mobile : +91 9820385757 e-mail : info@alphachemika.co.in
SECTION 2: Hazards identification
2.1 Classification of the substance or mixture
Classification according to Regulation (EC) No 1272/2008
Flam. Sol. 2
Classification source
Thermo Fisher Scientific SDS - Silicon powder AC20156 (rev. 19-Dec-2025, OSHA HCS 2024) - supplier classification, CAS verified
2.2 Label elements
Hazard pictograms
Flammable
Signal word
Warning
Hazard statements
H228: Flammable solid
Precautionary statements
P210, P240, P241, P280, P370+P378
2.3 Other hazards
Other hazards
Flammable dust; avoid ignition sources.
SECTION 3: Composition/information on ingredients
3.1 Substance
Name
Silicon
CAS No.
7440-21-3
SECTION 4: First aid measures
4.1 Description of first aid measures
First-aid measures after inhalation
If a person breathes large amounts of this chemical, move the exposed person to fresh air at once.
First-aid measures after skin contact
Wash with soap and water. If irritation occurs, seek medical attention.
First-aid measures after eye contact
If this chemical contacts the eyes, immediately wash (irrigate) the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately.
First-aid measures after ingestion
If this chemical has been swallowed, get medical attention immediately.
4.2 Most important symptoms and effects, both acute and delayed
Symptoms relating to use
Irritation of the respiratory tract, skin, and eyes.
4.3 Indication of any immediate medical attention and special treatment needed
General information
Treat symptomatically. Show this safety data sheet to the treating physician.
SECTION 5: Fire-fighting measures
5.1 Extinguishing media
Suitable extinguishing media
Water spray, carbon dioxide, dry chemical powder, foam.
Unsuitable extinguishing media
Not specified
5.2 Special hazards arising from the substance or mixture
Special procedures
Reacts violently with fire extinguishing agents such as water.
5.3 Advice for firefighters
Protection during firefighting
Do not enter fire area without proper protective equipment, including respiratory protection.
SECTION 6: Accidental release measures
6.1.1 For non-emergency personnel
Emergency procedures
Avoid dust formation. Use appropriate protective equipment. Ensure adequate ventilation.
6.3 Methods and material for containment and cleaning up
Methods for cleaning up
Sweep spilled substance into covered containers. If appropriate, moisten first to prevent dusting.
6.4 Reference to other sections
Reference
Not specified
SECTION 7: Handling and storage
7.1 Precautions for safe handling
Precautions for safe handling
Avoid dust formation. Use appropriate personal protective equipment (PPE).
Hygiene measures
Wash hands and other exposed areas with mild soap and water before eating, drinking or smoking and when leaving work.
7.2 Conditions for safe storage, including any incompatibilities
Storage conditions
Separated from incompatible materials. See Chemical Dangers.
SECTION 8: Exposure controls/personal protection
8.2 Exposure controls
Hand protection
Protective gloves (e.g. nitrile rubber)
Eye protection
Chemical safety goggles or safety glasses
Skin and body protection
Wear suitable protective clothing
Respiratory protection
Use a NIOSH-approved respirator if dust is generated.
SECTION 9: Physical and chemical properties
9.1 Information on basic physical and chemical properties
Physical state
Solid
Colour
Dark gray
Odour
Odourless
Odour threshold
Not applicable
pH value
Not applicable
Relative evaporation rate (butylacetate=1)
Not applicable
Melting point
1410 °C
Freezing point
Not applicable
Boiling point
2355 °C
Flash point
Not applicable
Auto-ignition temperature
Not applicable
Decomposition temperature
Not applicable
Flammability (solid, gas)
Flammable solid
Vapour pressure
1 Pa at 1635 °C; 10 Pa at 1829 °C; 100 Pa at 2066 °C; 1 kPa at 2363 °C; 10 kPa at 2748 °C; 100 kPa at 3264 °C
Relative vapour density at 20°C
Not applicable
Density
2.33 gcu cm at 25 °C4 °C
Solubility
Soluble in a mixture of nitric and hydrofluoric acids and in alkalis; insoluble in nitric and hydrochloric acid
Log Pow
Not applicable
Viscosity, kinematic
Not applicable
Viscosity, dynamic
Not applicable
Explosive properties
Not explosive
Oxidising properties
Not oxidizing
Explosive limits
Not applicable
SECTION 10: Stability and reactivity
10.1 Reactivity
Reactivity
Stable under normal conditions, but may react with strong oxidizers.
10.2 Chemical stability
Chemical stability
Stable under recommended storage conditions.
10.3 Possibility of hazardous reactions
Possibility of hazardous reactions
Reacts violently with oxidants, halogens, metal carbonates and metal acetylides. This generates fire hazard. Reacts violently with metal hexafluorides.
10.4 Conditions to avoid
Conditions to avoid
Avoid contact with incompatible materials and excessive heat.
10.5 Incompatible materials
Incompatible materials
Strong oxidizing agents, strong acids, and bases.
10.6 Hazardous decomposition products
Hazardous decomposition products
Not specified
SECTION 11: Toxicological information
11.1 Information on toxicological effects
Acute toxicity
LD50 Rat oral 3160 mg/kg; LC50; Rabbit (alveolar macrophages in culture); Concentration: 199 ugmL for 20 hr (95% confidence limits 116-339 mgmL); Conditions: temp 37 °C
Skin corrosion/irritation
Not classified (based on available data)
Serious eye damage/irritation
Not classified (based on available data)
Respiratory or skin sensitisation
Not classified (based on available data)
Germ cell mutagenicity
Not classified (based on available data)
Carcinogenicity
Not classified (based on available data)
Specific target organ toxicity (single exposure)
Not classified (based on available data)
Specific target organ toxicity (repeated exposure)
Not classified (based on available data)
SECTION 12: Ecological information
12.1 Toxicity
Toxicity information
Not specified
12.2 Persistence - degradability
Persistence - degradability
Not specified
12.3 Bioaccumulative potential
Bioaccumulative potential
Not specified
12.4 Mobility in soil
Mobility in soil
Not specified
12.6 Other adverse effects
Environmental precautions
Not specified
SECTION 13: Disposal considerations
13.1 Waste treatment methods
Additional Info
Dispose of contents/container in accordance with local, regional, national and international regulations.
SECTION 14: Transport information
14.1 UN number
UN-No. (ADR)
UN 1346
UN-No. (IMDG)
UN 1346
UN-No. (IATA)
UN 1346
UN-No. (ADN)
UN 1346
UN-No. (RID)
UN 1346
14.2 UN proper shipping name
Proper Shipping Name (ADR)
SILICON POWDER, AMORPHOUS
Proper Shipping Name (IMDG)
SILICON POWDER, AMORPHOUS
Proper Shipping Name (IATA)
Silicon powder, amorphous
Proper Shipping Name (ADN)
SILICON POWDER, AMORPHOUS
Proper Shipping Name (RID)
SILICON POWDER, AMORPHOUS
14.3 Transport hazard class(es)
Transport hazard class(es)
4.1
14.4 Packing group
Packing group (ADR)
III
Packing group (IMDG)
III
Packing group (IATA)
III
Packing group (ADN)
III
Packing group (RID)
III
14.5 Environmental hazards
Dangerous for the environment
Not specified
Marine pollutant
Not specified
Other information
No supplementary information available
SECTION 15: Regulatory information
15.1 Safety, health and environmental regulations/legislation specific for the substance or mixture
15.1.1 EU-Regulations
Not specified
SECTION 16: Other Information
Disclaimer
The information provided in this Safety Data Sheet is correct to the best of our knowledge, information and belief at the date of its publication. The information is designed only as a guidance for safe handling, use, processing, storage, transportation, disposal and release and is not to be considered a guarantee or quality specification. The information relates only to the specific material designated and may not be valid for such material used in combination with any other materials or in any process, unless specified in the text.