- ▸ Reinforcing filler in rubber compounds, including tire treads and technical rubber goods, where it improves tear strength, abrasion resistance and rolling-resistance performance versus carbon black.
- ▸ Anticaking and free-flow agent for powders, granular feeds and dry-mix formulations, where its high surface area absorbs surface moisture and keeps particles flowing.
- ▸ Matting and flatting agent in coatings, inks and overprint varnishes to reduce gloss and produce controlled satin or matte finishes.
- ▸ Rheology modifier, thickener and anti-settling additive in liquid systems such as paints, adhesives, sealants and unsaturated polyester resins.
- ▸ Carrier and de-dusting agent for liquid actives in agrochemical and industrial powder formulations, converting liquids into free-flowing solids.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
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Precipitated silica is a synthetic amorphous silica used as a reinforcing filler, anti-caking and carrier agent, matting agent and defoamer component across rubber, coatings and industrial products. Identity: CAS 112926-00-8.
What it is
Precipitated silica (CAS 112926-00-8, SiO2) is a fine, high-surface-area amorphous silica made by precipitation. Grades vary in surface area, particle/aggregate size and structure for different functions.
Industrial uses
It is used as a reinforcing filler in rubber (tires, technical goods, silicone rubber), an anti-caking agent and free-flow/carrier for powders and liquids, a matting and rheology agent in coatings and inks, a carrier for defoamers and actives, and a thickening/reinforcing additive in many industrial formulations.
Related: hydrophobic fumed silica.
Forms, grades and handling
Precipitated silica is supplied in powder and granule grades varying in surface area and structure; specify the application. Properties are typical reference values; the Certificate of Analysis (CoA) for the lot you buy governs. Always consult the current Safety Data Sheet (SDS) before handling, and confirm regulatory status and suitability for your application and jurisdiction. Each lot ships with CoA, TDS and SDS.
Bulk supply and RFQ
RawSource sources Precipitated Silica direct from producers in bulk, with CoA, TDS and SDS per lot. Tell us the grade, particle size or specification and quantity you need, and we will quote it. Products are sold for industrial and professional use.
Typical Properties
Typical reference values, not a specification; the Certificate of Analysis (CoA) for the lot governs.
| Property | Typical Value |
|---|---|
| Chemical / class | Synthetic amorphous silica |
| CAS Number | 112926-00-8 |
| Molecular Formula | SiO2 |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US): Not found on the public (non-confidential) TSCA Inventory
- REACH (EU):
- EC number: 231-545-4
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is precipitated silica used for?
Precipitated silica (CAS 112926-00-8) is a synthetic amorphous silica used as a reinforcing filler in rubber, an anti-caking agent and carrier, a matting/rheology agent in coatings, and a defoamer carrier. RawSource supplies it for industrial use.
What is the difference between precipitated and fumed silica?
Both are synthetic amorphous silicas; precipitated silica is made by precipitation (lower cost, used for reinforcement, anti-caking and carriers), while fumed silica is made by flame hydrolysis (higher purity/structure, used for rheology control and reinforcement). Choose by function.
How is bulk precipitated silica supplied and quoted?
RawSource supplies precipitated silica in bulk with CoA, TDS and SDS per lot. Pricing is quote-based on grade, particle size/specification and volume; submit an RFQ with your application and quantity.
What is the REACH and TSCA regulatory status of Precipitated Silica?
Precipitated Silica (CAS 112926-00-8) is recorded as REACH-registered in ECHA's public CHEM database (EC 231-545-4); it was not found on EPA's public (non-confidential) TSCA Inventory file.