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Silicon

CAS Number
7440-21-3
EC Number
231-130-8
Chemical Formula
Si
Molecular Weight
28.085 g/mol

Description

Silicon (CAS 7440-21-3 ), commonly traded as silicon metal or Si, is a high-purity elemental material refined from quartz and used as a foundational raw material across metallurgical, chemical, and electronic manufacturing supply chains. It functions primarily as a precursor for producing silicones, semiconductors, and aluminum alloys rather than as a finished additive. In the plastics and polymer industry, silicon metal is the primary feedstock for manufacturing silicone polymers. These include silicone fluids, elastomers, and sealants used in automotive and construction applications. Automotive manufacturers rely on aluminum-silicon alloys produced with metallurgical-grade silicon to achieve lightweight, high-strength castings. These castings are essential for engine components and structural parts. In electronics, ultra-high-purity silicon is processed into wafers that form the substrate for semiconductors, solar cells, and integrated circuits. Chemical producers also use it as a starting material for synthesizing chlorosilanes and other organosilicon intermediates. Silicon metal is supplied as chunks, granules, or powder, with particle size and purity grade selected based on end-use requirements. Metallurgical grade (typically 98–99% Si) covers alloy and chemical synthesis applications, while semiconductor and solar grades are held to significantly tighter purity thresholds. Standard packaging ranges from bulk bags to drums. Contact us for supply of Silicon Request Quote

Other Names (Synonyms)

element 14 | 14Si | Silicon metal | Defoamer S-10 | Silicon, elemental | Silicium | Z4152N8IUI | Elemental silicon | Si

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point1410 °C
Boiling Point2355 °C
Density2.33 g/cm³ @ Temp: 25 °C
Flash Point2.33 °C
AppearanceSilicon is a nonmetallic element which is known as silicon metal. Not occur freely in nature, but is found in silicon dioxide (silica) and in various silicates. It is a steel-gray crystalline solid or a black-brown amorphous material.
ColorWhite
OdorOdorless
Formpowder
Water SolubilityINSOLUBLE
Refractive Index3.9766
pH13.5 (H2O, 20°C)

Safety & Handling

Danger
GHS02· Flammable

Hazard Statements

H228Flammable solid
H320Causes eye irritation

Precautionary Statements

P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P240Ground and bond container and receiving equipment.
P241Use explosion-proof equipment.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P265Wash … thoroughly after handling.
P317If eye irritation persists: Get medical advice/attention. Get emergency medical help.
P378Use … for extinction.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code28046900
UN Number2922
ADR Class8
Packing GroupII
Storage Class4.1B - Flammable solid hazardous materials
WGK (Germany)2