Precipitated Silica (SiO₂)
High Surface Area Synthetic Amorphous Silicon Dioxide – Reliable Bulk Supplier for Reinforcement, Rheology Modification, Anti-Caking, and Carrier Applications Across Industrial Sectors
Precipitated Silica is a synthetic amorphous silicon dioxide produced via controlled precipitation of sodium silicate with mineral acids. It is widely specified in industrial formulations requiring high surface area, controlled porosity, rheology modification, reinforcement, anti-caking performance, or carrier functionality.
Natraj Chem supplies consistent-quality precipitated silica sourced from verified top-tier manufacturers, meeting industrial buyers' requirements for reproducibility, lot-to-lot uniformity, and dependable bulk availability.
Chemical Identity
| Parameter | Specification |
|---|---|
| Chemical Name | Synthetic Amorphous Silicon Dioxide |
| Common Names | Precipitated Silica, Hydrated Silica |
| Molecular Formula | SiO₂·nH₂O |
| CAS Number | 7631-86-9 |
| EC Number | 231-545-4 |
| Appearance | White free-flowing powder or micro-granules |
| Solubility | Insoluble in water; soluble in strong alkali |
| pH (5% slurry) | 6.0 – 8.5 |
| Structure | Amorphous porous aggregate |
Technical Properties
Precise physical and chemical characteristics engineered for consistent industrial performance.
| Property | Typical Range |
|---|---|
| BET Surface Area | 50 – 800 m²/g |
| Oil Absorption | 100 – 350 g/100g |
| Bulk Density | 0.08 – 0.40 g/cm³ |
| Loss on Drying | ≤ 7% |
| Ignition Loss | ≤ 8% |
| Particle Size (D50) | 3 – 25 µm |
| Silica Content (SiO₂) | ≥ 93 – 99% |
| Porosity | High internal void volume |
| Refractive Index | ~1.46 |
Values vary depending on grade and functional design.
Key Functional Benefits
Performance-defining properties that make precipitated silica the preferred engineered mineral in demanding formulations
High Specific Surface Area
Surface area up to 800 m²/g enables superior reinforcement and adsorption, maximising interfacial contact in elastomers and carrier formulations.
Controlled Pore Structure
Engineered internal void volume for precise liquid absorption and controlled release – critical in agrochemical and pharmaceutical carrier applications.
Chemically Inert & Non-Toxic
Stable amorphous mineral with no reactivity toward most organic and aqueous systems. Approved for food, feed, and pharmaceutical use at relevant grades.
Viscosity & Thixotropy Control
Improves rheological behaviour in coatings, adhesives, and sealants – preventing sag while maintaining application fluidity through shear thinning.
Enhanced Abrasion Resistance
Significantly improves wear characteristics in rubber and elastomers, extending service life in tire compounds and industrial seals.
Anti-Caking Performance
Reduces agglomeration in hygroscopic powders and granular blends, maintaining reliable free-flow behaviour throughout storage and handling.
Matting & Opacity Control
Delivers reproducible gloss reduction and controlled opacity management in industrial coatings, wood finishes, and UV-cured systems.
Wide Temperature & Chemical Stability
Stable across broad temperature ranges and compatible with most organic and aqueous systems in demanding processing environments.
Industrial Applications
Scroll down to watch how precipitated silica enhances performance across key sectors — continuous loop
Rubber & Tires
Reinforcing filler for tensile strength, tear resistance & low rolling resistance in green tires.
Agrochemicals
High-load carrier, dispersing aid & anti-settling in wettable powders & granules.
Food & Feed
Anti-caking & flow agent in powders, spices, milk & animal feeds.
Coatings & Paints
Matting, rheology & scratch resistance in industrial & UV systems.
Oral Care
Controlled abrasive for RDA-safe polishing & thickening in toothpaste.
Plastics & Polymers
Reinforcement & anti-blocking in films & compounds.
Pharmaceuticals
Glidant, carrier & stabilizer improving flow & API stability.
Adhesives & Sealants
Thixotropy & anti-sag in construction & automotive systems.
Rubber & Tires
Reinforcing filler for tensile strength, tear resistance & low rolling resistance in green tires.
Agrochemicals
High-load carrier, dispersing aid & anti-settling in wettable powders & granules.
Food & Feed
Anti-caking & flow agent in powders, spices, milk & animal feeds.
Coatings & Paints
Matting, rheology & scratch resistance in industrial & UV systems.
Oral Care
Controlled abrasive for RDA-safe polishing & thickening in toothpaste.
Plastics & Polymers
Reinforcement & anti-blocking in films & compounds.
Pharmaceuticals
Glidant, carrier & stabilizer improving flow & API stability.
Adhesives & Sealants
Thixotropy & anti-sag in construction & automotive systems.
Grades / Specifications Available
Multiple functional grades engineered to match specific process conditions and regulatory requirements
High Surface Area Grade
Up to 800 m²/g for reinforcement, adsorption, and high-reactivity formulations requiring maximum interfacial activity.
Low Density Grade
Ultra-low bulk density for anti-caking, flow improvement, and carrier applications where minimum loading density is critical.
Granular Grade
Dust-reduced granular form for safe bulk handling in industrial environments while maintaining full technical performance.
Matting Grade
Precision-engineered for coatings clarity control with consistent gloss reduction across industrial and decorative coating systems.
Food Grade
Low impurity profile meeting FCC food additive standards for processing, dietary supplements, and nutraceutical formulations.
Rubber Grade
High structure aggregates engineered for elastomer reinforcement – optimized for tire and rubber compound processing performance.
Carrier Grade
High absorption capacity grade for agrochemical and pharmaceutical carrier applications with controlled pore volume for liquid loading.
Custom Specifications
Tailored surface area, particle size, oil absorption, and purity targets for OEM requirements and specialized formulation needs.
💡 Need Help Selecting the Right Grade?
Our technical team provides expert consultation on grade selection based on your application requirements, processing conditions, and regulatory compliance needs. Contact us to discuss your formulation challenges.
Quality Control Parameters
Every batch is systematically verified across a complete sequence of acceptance criteria before release
BET Surface Area
Surface area by nitrogen adsorption BET method
Particle Size (PSD)
Laser diffraction for D10, D50, D90 distribution
Moisture Content
Loss on drying determination at 105 °C
Loss on Ignition
Combustion loss testing at 1000 °C
pH Slurry
5% aqueous measurement for acidity / alkalinity
Oil Absorption
ASTM D281 oil absorption value for carrier capacity
Bulk Density
Tapped and untapped bulk density for processing specs
Purity & Heavy Metals
SiO₂ assay and heavy metal screening where required
Packaging & Supply
Four packaging formats scaled to your volume requirements — from lab-scale to full bulk supply
Storage & Handling
Follow these guidelines to maintain product integrity and ensure workplace safety throughout storage and use
Store in Dry, Ventilated Warehouse
Maintain ambient temperature storage with adequate ventilation. Avoid damp environments and locations subject to condensation or temperature extremes.
Keep Containers Sealed When Not in Use
Reseal bags and containers immediately after use. Moisture ingress leads to agglomeration and degradation of flow properties and surface area.
Use Local Exhaust Ventilation During Bulk Transfer
Fine grades generate airborne dust during transfer. Install local exhaust ventilation in bulk handling areas to control workplace dust levels at source.
Wear Standard PPE During Handling
P2 dust mask, safety glasses, and gloves should be worn when handling fine powder grades in enclosed or confined spaces.
Maintain Grade Segregation in Storage
Store different grades separately and clearly labelled to prevent cross-contamination, particularly between food-grade and industrial-grade material.
Shelf life is typically 24 months when stored under recommended conditions. Check packaging date and COA for specific lot information.
Regulatory / Safety Information
Precipitated silica is classified as non-hazardous under most transport regulations and not classified as crystalline silica. Full documentation is provided for all supply grades.
Users must follow local occupational exposure limits and dust control regulations applicable to amorphous silicon dioxide.
Technical Support & Documentation
End-to-end technical assistance — from initial grade selection through to ongoing supply optimisation
Why Industries Source from Natraj Chem
- Operating since 1984 within industrial chemical supply chains
- Deep technical knowledge from original aluminium derivative manufacturing background
- Established sourcing partnerships with audited producers
- Strict incoming quality verification protocols
- Reliable multi-grade availability for long-term contracts
- Industrial-scale logistics coordination
- Consistent supply assurance for production-critical materials
The sourcing model ensures consistent quality without production variability risks.
Frequently Asked Questions
It acts as a reinforcing filler improving durability, elasticity, and abrasion resistance. It is widely used in green tire compounds for reduced rolling resistance.
No. Precipitated silica is wet-process manufactured with porous aggregates, while fumed silica is flame-hydrolyzed and has different surface chemistry and application profile.
Low-density, high-absorption grades are typically specified for powder flow improvement and anti-caking performance in food and industrial applications.
It is insoluble in water but dissolves in strong alkaline solutions, making it stable in most aqueous formulation systems under normal pH conditions.
Oral care grades generally range from 100–300 m²/g depending on polishing index and cleaning performance requirements.
Yes. Food-approved grades are used as anti-caking agents where regulations allow, subject to applicable food additive standards and usage limits.
It controls gloss, improves scratch resistance, stabilizes viscosity, and enhances thixotropic behavior in industrial and decorative coating systems.
Silica gel has a defined pore structure for adsorption, while precipitated silica is designed for reinforcement, rheology control, and functional additive applications.
Generally considered low hazard and not classified as crystalline silica, but fine dust requires respiratory protection and standard industrial hygiene practices.
Key factors: surface area, structure level, oil absorption, particle size, purity, and consistency across batches to ensure formulation performance reliability.
Get Technical Data & Custom Quote Today
Precipitated Silica is a multifunctional engineered mineral essential across manufacturing sectors. Fast responses with full documentation — no obligation.
- Technical datasheets (TDS) & Safety Data Sheets (SDS)
- Certificate of Analysis (COA) samples
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