BK95 micro silica powder for refractory materials is a higher-purity pozzolanic grade (SiO₂ ≥95%) for medium-to-high-grade unshaped refractories. With lower impurity content, it delivers better filling effect and sintering performance. It is suitable for high-grade refractory castables, precast parts and mortars requiring stable high-temperature strength and anti-erosion performance.
Technical Specifications
| Product model | BK95 |
|---|---|
| SiO₂ | ≥ 95.0% |
| Loss on ignition | 1.0% |
| Moisture | ≤ 1.5% |
| Water demand | 114% |
| Specific surface area | 18,500 m²/kg |
| Activity index | 120% |
| Bulk density | 350–450 kg/m³ |
| Standard | GB/T 27690-2023 |
| pH value | 7.2 |
| Packing | 25 kg bag or 1,000 kg jumbo bag |
Product Strengths
- Higher purity with low impurities
- Improved sintering and erosion resistance
- Densified and undensified options
- COA for confirmed batches
Target Applications
- High-grade refractory castables
- Refractory precast parts
- Industrial furnace linings
- Refractory mortar
Quality Assurance
- ISO 9001 quality control with GB/T 27690-2023 compliance.
- Chemical inspection per lot; COA certificate provided.
- Free samples for formula testing.
Frequently Asked Questions
What is the difference between BK93 and BK95?
BK95 has higher SiO₂ and lower impurities for more demanding refractory formulations.
Is densified BK95 available?
Yes. Both densified and undensified forms can be supplied.
