Metallurgical silicon
CAS 7440-21-3
EC 231-130-8
Formula Si
MW 32.12 g/mol
Silicones & Silicates ElectronicsPlastics & PolymersAutomotive
Description
Metallurgical Silicon (CAS 7440-21-3, EC 231-130-8, HS 28046900) is a refined elemental silicon produced by reducing silica in electric arc furnaces. It is commercially available under trade names including SILSO, KDB 20, and HGH 600, and carries no assigned E-code. The material is classified under Silicones & Silicates.
In electronics manufacturing, metallurgical silicon serves as the primary feedstock for producing polysilicon wafers, where its high purity enables controlled semiconductor behavior. In polymer chemistry, it reacts with methyl chloride to synthesize organochlorosilanes, the building blocks of silicone resins, fluids, and elastomers used across automotive sealing and thermal management applications.
Metallurgical Silicon is supplied in powder form across multiple purity grades suited to semiconductor, chemical, and industrial end uses. The substance is registered under REACH and must be handled in accordance with applicable EU chemical regulations. Standard packaging formats vary by grade and order volume.
In electronics manufacturing, metallurgical silicon serves as the primary feedstock for producing polysilicon wafers, where its high purity enables controlled semiconductor behavior. In polymer chemistry, it reacts with methyl chloride to synthesize organochlorosilanes, the building blocks of silicone resins, fluids, and elastomers used across automotive sealing and thermal management applications.
Metallurgical Silicon is supplied in powder form across multiple purity grades suited to semiconductor, chemical, and industrial end uses. The substance is registered under REACH and must be handled in accordance with applicable EU chemical regulations. Standard packaging formats vary by grade and order volume.
Physical Properties
| Melting Point | 1410 °C |
| Boiling Point | 2355 °C |
| Density | 2.33 g/cm³ @ Temp: 25 °C |
| Flash Point | 2.33 °C |
| Appearance | Silicon 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. |
| Color | White |
| Odor | Odorless |
| Form | powder |
| Water Solubility | INSOLUBLE |
| Refractive Index | 3.9766 |
| pH | 13.5 (H2O, 20°C) |
Safety & Handling (Learn More)
Danger GHS02
H
H228H320
P
P210P240P241P280P264+P265P337+P317P370+P378P305+P351+P338
Trade & Regulatory
| HS Code | 28046900 |
| UN Number | 2922 |
| ADR Class | 8 |
| Packing Group | II |
| Storage Class | 4.1B - Flammable solid hazardous materials |
| WGK (Germany) | 2 |
Other Names
14SiSiliconelement 14SILSOKDB 20HGH 600
Related Products
Derivatives
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