Undensified Microsilica (Silica Fume) Grade 85U
Undensified Microsilica with Minimum SiO₂ Content 85%
- Large specific surface area.
- Strong absorbability.
- High whiteness.
- High purity.
- Grade 85U is widely used in fertilizer application, with strong moisture absorbability, as anti-caking agent or pellet binding agent, etc.
| Property | Value |
| SiO2 (Silicon Dioxide, Amorphous) | 85% min |
| SO3 | 1.0% max |
| Cl | 0.3% max, typical 0.033% |
| Free CaO | 1.0% max, typical 0.92% |
| pH | > 6 |
| Moisture | 3% max |
| LOI (Loss on Ignition) | 6% max, typical 3.23% |
| Specific surface (BET) | 18 m2/gram min |
| Bulk Density | 300-450 kg/m3 |
| PAI (Pozzolanic Activity Index) – 7 days accelerated curing | 105% min |
| Retained on 45 micron sieve | 10% max, typical 1.08% |
| Fluidity | > 18 cm |
Standards
ACC® Microsilica Grade 85U conforms to the mandatory requirements of the relevant standards from:
- American Society for Testing and Materials (ASTM C 1240).
- European Committee for Standardisation.
Quality Control
ACC® Microsilica is certified according to ISO 9001.
The chemical composition and physical properties are regularly tested in accordance with international standards.
Packaging
The product is supplied in a range of packaging:
- 500/600kg double plastic woven jumbo bag.
- 20/25kg woven bags with PE liner.
- Special packaging can be supplied on request.