BK93 high activity micro silica powder for refractory materials is a high-activity pozzolanic by-product produced from metal-silicon smelting. As a critical additive for unshaped refractory products, it fills tiny gaps among refractory aggregate particles, reduces water demand and enhances green body strength. Widely adopted in heating furnace castable, CFB boiler castable and ladle castable, it optimizes high-temperature sintering and anti-erosion performance.
Technical Specifications
| Product model | BK93 |
|---|---|
| SiO₂ | ≥ 93.0% |
| Loss on ignition | 1.2% |
| Moisture | ≤ 1.5% |
| Water demand | 113% |
| Specific surface area | 18,000 m²/kg |
| Activity index | 118% |
| 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
- High pozzolanic activity and compactness
- Lower water demand and stronger green body
- Densified and undensified options
- Batch COA available
Target Applications
- Heating-furnace castables
- CFB boiler castables
- Ladle linings
- Refractory precast parts and mortar
Quality Assurance
- ISO 9001 quality control with GB/T 27690-2023 compliance.
- Full-item inspection before delivery; COA provided.
- Free samples for formula testing.
Frequently Asked Questions
Can BK93 be supplied in densified form?
Yes. Densified low-dust and undensified fine-filling forms are available.
Do you provide samples?
Yes. Free test samples are available; the buyer covers freight.
