Reinforcement-Grade Precipitated Silica with Ultra-High BET 700–750 m²/g
SN-A81 is a high-purity precipitated silica achieving an ultra-high BET specific surface area of 700–750 m²/g. This is 3–4 times greater than typical precipitated silica (150–250 m²/g), which is the product's core competitive advantage.
Key Features
- 📊 Extremely High Specific Surface Area — 700–750 m²/g — 3–4× higher than conventional silica, enabling high reinforcement even at low loadings
- 🧪 High Purity (≥99%) Stability — Extremely low impurities (heavy metals, Na₂SO₄, etc.) ensure excellent chemical stability — ideal for advanced materials requiring electrical insulation and thermal stability
- ⚙️ Fine and Uniform Particle Size — Ultra-fine 7–8 µm powder ensures uniform dispersion in rubber, resin, and adhesives — enabling smooth composite manufacturing without surface defects
- 💧 Optimal DBP Absorption — 90–130 ml/100g — maintains adequate structure without excessive oil absorption, applicable to high-loading formulations
- ⚖️ Neutral pH (6.5–7.5) — Prevents damage to crosslinking structures in organic binders and rubber caused by acidic or alkaline silica — minimizes side reactions with curing agents, crosslinkers, and catalysts
- ✨ Outstanding Whiteness (≥95) — Does not affect the color or transparency of finished products — highly usable as a base material in coloring and coating processes
- 🔥 Excellent Thermal Stability — Ignition loss of only 3–5% at 1000°C — minimal weight change or volatile release during high-temperature processes; properties maintained through hot curing, injection, and extrusion
Technical Specifications
| Item | Value | Note |
|---|---|---|
| Grade | SN-A81 | |
| Form | White powder | Pure white powder |
| Whiteness | ≥ 95 | |
| SiO₂ (Dry Basis) | ≥ 99% | Ultra-high purity |
| pH | 6.5 – 7.5 | Neutral |
| BET Specific Surface Area | 700 – 750 m²/g | Ultra-high SSA |
| DBP Oil Absorption | 90 – 130 ml/100g | |
| Average Particle Size | 7 – 8 µm | |
| Loss on Drying (105℃, 2 hr) | 3.0 – 4.0 % | |
| Ignition Loss (1000℃, 2 hr) | 3.0 – 5.0 % | |
| Country of Origin | China |
Main Applications
Precipitated Silica
Particle size, purity, surface treatment and packaging can be customized to your specification. Contact us for samples, TDS and quotations.