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Silica

CAS Number
7631-86-9
EC Number
231-545-4
Chemical Formula
O2Si
Molecular Weight
60.084 g/mol

Description

Silica (CAS 7631-86-9 ), also known as silicon dioxide or SiO2, is a high-purity amorphous mineral used across industrial and consumer product manufacturing. As E551 in food-contact and additive applications, it functions primarily as an anticaking agent. It serves as a flow aid and rheology modifier in powder and liquid systems. In personal care, silica controls texture and oil absorption in pressed powders, dry shampoos, and skincare formulations where sensory performance and spreadability are critical. Rubber and tire compounding relies on precipitated silica as a reinforcing filler that improves rolling resistance and wet grip performance in high-performance tire compounds. Plastics and polymer processing uses fumed silica to modify viscosity. This application is vital in adhesives, sealants, and coatings, preventing sagging and improving shelf stability. In printing and packaging, silica acts as a matting agent and anti-slip additive in inks and surface coatings. Silica is supplied as fumed silica, precipitated silica, and colloidal silica dispersions, each suited to different processing requirements. Standard grades include food-grade ( FCC , E551) and pharmaceutical-grade options. These pharmaceutical grades meet USP and Ph. Eur. standards, alongside technical-grade for industrial applications. Particle size, surface area, and surface treatment vary by grade and determine suitability. Hydrophilic or hydrophobic treatments are available depending on specific formulation or processing conditions. This versatility ensures that the material meets the rigorous demands of diverse global manufacturing sectors. Contact us for supply of Silica Request Quote

Other Names (Synonyms)

silicic anhydride | silicon oxide | SILICON DIOXIDE | Diatomaceous silica | Wessalon | Zorbax sil | Silica, amorphous | Silica, colloidal | SiO2 | E220A

Key Technical Features

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

Physical Properties

Melting Point1713 °C
Boiling Point2230 °C
Density0.729 g/cm³ (solid)
Flash Point2230°C
AppearanceAmorphous silica, the noncrystalline form of SiO2, is a transparent to gray, odorless, amorphous powder
ColorWhite to yellow
Odorat 100.00?%. odorless
Formsuspension
Water Solubilityinsoluble
Vapor Pressure13.3hPa at 1732℃
Refractive Index1.46
pH5-8 (100g/l, H2O, 20℃)(slurry)

Safety & Handling

Warning
GHS07· IrritantGHS08· Health Hazard

Hazard Statements

H315Causes skin irritation
H319Causes serious eye irritation
H320Causes eye irritation
H335May cause respiratory irritation
H341Suspected of causing genetic defects
H350May cause cancer
H372Causes damage to organs through prolonged or repeated exposure
H373May causes damage to organs through prolonged or repeated exposure

Precautionary Statements

P203Obtain, consult and follow expert instructions for use.
P260Do not breathe dust/fume/gas/mist/vapours/spray.
P261Avoid breathing dust/fume/gas/mist/vapours/spray.
P264Wash … thoroughly after handling.
P270Do not eat, drink or smoke when using this product.
P271Use only outdoors or in a well-ventilated area.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P318IF exposed or concerned, get medical advice.
P319Get medical advice/attention if you feel unwell.
P321Specific treatment (see … on this label).
P405Store locked up.
P501Dispose of contents/container in accordance with local regulations.
P265Wash … thoroughly after handling.
P352IF ON SKIN: Wash with plenty of water.
P340IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P317Get emergency medical help.
P317If eye irritation persists: Get medical advice/attention. Get emergency medical help.
P364Take off contaminated clothing and wash it before reuse.
P233Store in a well-ventilated place. Keep container tightly closed.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code2811221000
Storage Class12 - Non Combustible Liquids
WGK (Germany)nwg