Precipitated Silica for Silicone Rubber

Precipitated silica is a high-performance reinforcing filler for silicone rubber compounds. It improves tensile strength, tear resistance, abrasion resistance, and processing performance while helping maintain transparency and color stability in finished silicone products.

Item NO.:
Silicone Rubber Form
Goods Stock:
1
EINECS No:
238-878-4
CAS No.:
10279-57-9
Chemical Formula:
SiO2

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Precipitated Silica for Silicone Rubber

Chemical Properties

In silicone rubber compounds, precipitated silica serves as an effective reinforcing filler, improving tensile strength, tear resistance, abrasion resistance, and processing stability. It also helps maintain transparency and color stability in finished silicone products.

Specifications

Silicone Rubber Grade Precipitated Silica
Type	Felcosil-799	Felcosil-779-1	Felcosil-800
BET specific surface area，m²/g	145±15	165±15	165±15
Heating loss（105° 2h）, %	4.0-8.0
Lgniting loss（1000° 2h）, %	≤7.0
SiO₂ % Min, %	≥98.0
pH（5% suspension）	6.0-7.0
DBP Absorption, cm³/g	2.00-2.70
Salt as Na₂SO₄, %	≤0.7
Total Fe, mg/kg	≤200
Median Size：D50, um	12±2

Precipitated Silica for Silicone Rubber Compounds

Precipitated silica is a reinforcing filler specifically developed for silicone rubber compounds. It is widely used by compound manufacturers to improve mechanical properties, processing performance, and product consistency.
The material contributes to higher tensile strength, improved tear resistance, and enhanced abrasion resistance while maintaining good transparency and appearance stability. Its excellent dispersibility supports efficient mixing and uniform compound quality.
Typical applications include HTV and RTV silicone compounds used in seals, gaskets, tubing, cable accessories, industrial components, and other technical silicone products.
With high purity, low impurity levels, and reliable batch consistency, it helps manufacturers achieve stable processing and dependable product performance.

SiO2, Precipitated Silica, White Carbon, Silicon Dioxide, Silica Powder, Amorphous Precipitated Silica

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