Silicon dioxide
CAS 7631-86-9O2Si60.084 g/mol
Silicon dioxide is a silicon oxide made up of linear triatomic molecules in which a silicon atom is covalently bonded to two oxygens.
IUPAC: dioxosilane
PubChem
Physical & Chemical Properties
| Melting Point | 3110 °F (NIOSH, 2024) |
| Boiling Point | 4046 °F at 760 mmHg (NIOSH, 2024) |
| Density | 2.2 (NIOSH, 2024) - Denser than water; will sink |
| Solubility | Insoluble (NIOSH, 2024) |
| Vapor Pressure | 0 mmHg (approx) (NIOSH, 2024) |
| Appearance | Transparent to gray, odorless powder. Irritating to the skin and eyes on contact. Inhalation will cause irritation in the respiratory tract. [Note: Amorphous silica is the non-crystalline form of SiO2.] |
Data: PubChem · Last updated: 4/20/2026
GHS Classification
No GHS classification data available.
Classification data is sourced from ECHA.
Regulatory Compliance
TSCA
Listed
note: Status based on EPA TSCA Active Inventory · inventory name: TSCA Chemical Substance Inventory
View sourceGlobal Trade Intelligence
No trade flow data available for this chemical.
HS Code(s): 2811
Data: UN Comtrade
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