Si
28.085 g/mol
Industrial ChemicalDanger
SILICON
CAS7440-21-3EC231-130-8
Category
Industrial Chemical
Compound Class
Other
Primary Use
Semiconductor and photovoltaic material
Silicon is a dark brown amorphous powder that is insoluble in water and denser than water. It burns readily when exposed to heat or flames and is used as a key material in semiconductor and photovoltaic devices, such as solar cells and computer microchips.
Manufacture of semiconductors, transistors, and diodesProduction of solar cells for photovoltaic devicesSynthesis of silanes and silicones
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
StrongSame Parent
Lithium silicon
CAS68848-64-6
Lithium silicon alloy production
StrongStructure SimilarSimilarity 1.00
Silane
CAS7803-62-5
Silicon source for semiconductor deposition
StrongStructure SimilarSimilarity 1.00
Aluminium--silane (1/1)
CAS11145-27-0
hydride reagent and reducing agent
ReferenceSame Category
Silver
CAS7440-22-4
metal alloying and antibacterial agent
ReferenceSame Category
Sodium
CAS7440-23-5
Chemical intermediate and reducing agent
ReferenceSame Category
Argon
CAS7440-37-1
Inert gas for welding and metal refining
ReferenceSame Category
Boron
CAS7440-42-8
Industrial chemical for glass and borate production
Safety Reference
Danger
H228Flammable solid
H320Causes eye irritation
Regulatory Compliance1
- CN Catalogue of Hazardous ChemicalsCNRegulation
Customs Tariff Classification
The international HS code for SILICON (CAS 7440-21-3) is 2804.61.
HS code (international, 6-digit)
2804.61
EU CN code (8-digit)
2804 61 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
silicon
InChIKey
XUIMIQQOPSSXEZ-UHFFFAOYSA-N
SMILES
[Si]
Synonyms (76)
- Q670
- SILANE
- SILICON
- 14Si
- 7440-21-3(powder)
- Atomic Silicon
- Defoamer S-10
- Element Silicon
- Element-Si
- Elemental silicon
- Meteorite
- Meteorite 8133
- SILICON [MART.]
- Si
- Si (element)
- Silane, 7.0 - 7.5% in argon
- Silane, compressed
- Silicium
- Silicium Metallicum
- Silicon (Si)
- Silicon (atomic)
- Silicon 28
- Silicon Nanopowder
- Silicon Nanowire Dispersion
- Silicon Standard
- Silicon chips
- Silicon dust
- Silicon element
- Silicon metal
- Silicon nanopowder (100 nm)
- Silicon nanopowder (500 nm)
- Silicon nanopowder (~ 30 nm)
- Silicon nanopowder (~ 50 nm)
- Silicon powder
- Silicon powder 15-53 micron
- Silicon powder 325 mesh
- Silicon powder 45-90 micron
- Silicon powder 50-150 micron
- Silicon powder, amorphous
- Silicon random pieces
- Silicon, CP
- Silicon, elemental
- Silicone
- Silizium
- silicio
- silicon atom
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