Silica, fumed
Tech Serve Solutions offers fumed silica (CAS 112945-52-5), a synthetic amorphous silicon dioxide (SiO2) with a molecular weight of 60.08. This fine white powder is characterized by its extremely low bulk density, high surface area (200 m²/g), and small particle size (0.007 μm). It is widely utilized as a rheology modifier, thickening agent, and anti-settling agent in various industrial applications.
- IUPAC
- Silica,Silicic anhydride,Silicon dioxide amorphous,Silicon dioxide
- Synonyms
- SiO2Silica, fumedSilicic anhydrideSilicon dioxide amorphousSilicon dioxide
Rheology Modifier and Thickener
Fumed silica is extensively used to control viscosity and thixotropy in liquid systems such as paints, coatings, adhesives, and sealants. Its high surface area creates a network structure, preventing sag and settling.
Reinforcing Filler
In silicone elastomers and other polymers, fumed silica acts as a reinforcing filler, significantly enhancing mechanical properties like tensile strength and tear resistance. It improves the overall durability and performance of the materials.
Free-Flowing Agent
Incorporated into powders and granular materials, fumed silica prevents caking and clumping by coating particles and reducing inter-particle attraction. This ensures improved flowability for products like food supplements and cosmetics.
Carrier and Absorbent
Due to its porous structure and high surface area, fumed silica can act as a carrier for liquids or an absorbent for moisture. It is employed in the formulation of certain pesticides, catalysts, and diagnostic test kits.
| Molecular weight | 60.08 |
|---|---|
| Linear formula | SiO2 |
| Assay | 99.8% |
| Form | powder |
| Density | 2.3 lb/cu.ft at 25 °C (bulk density)(lit.) |
| Refractive index | n20/D 1.46(lit.) |
| Particle size | 0.007 μm |
| Protective equipment | Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter |
|---|---|
| Water hazard class (WGK, DE) | 2 |
| Cation traces | metal ions:, practically free |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Surface Area | 200 m2/g±25 m2/g |
|---|---|
| Avg Part Size | 0.2-0.3 μm (aggregate) |
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is fumed silica primarily used for?
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Fumed silica is primarily used as a rheology modifier, thickening agent, anti-settling agent, and reinforcing filler in a wide range of industrial products including paints, coatings, adhesives, elastomers, and powders.
What are the CAS number and chemical formula for fumed silica?
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The CAS number for fumed silica is 112945-52-5, and its chemical formula is SiO2.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies fumed silica with an assay of 99.8%. This product is not represented as USP, BP, EP, or other pharmacopoeial grades.
What safety precautions should be taken when handling fumed silica?
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When handling fumed silica, it is essential to wear appropriate personal protective equipment, including eyeshields and gloves. Use a type N95 (US) or type P1 (EN143) respirator filter to avoid inhalation of airborne particles, which can cause respiratory irritation. Ensure adequate ventilation.
Is fumed silica a controlled substance?
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Based on the provided data, fumed silica is not listed as a controlled substance.
How is fumed silica packed, shipped, and exported by TSS?
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Tech Serve Solutions professionally packs, ships, and exports fumed silica in compliance with international regulations to meet the needs of researchers and industries worldwide.
How can I request a sample or a quote for fumed silica?
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To request a sample or obtain a quote for fumed silica, please contact our sales team through the website or call us directly.
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