Undensified silica fume USF 920 is a highly effective pozzolanic material known for its very small particle size and strong absorbability. This unique combination enhances its reactivity, making it an ideal additive for concrete and cement applications. The high pozzolanic activity index of undensified silica fume USF 920 significantly contributes to improved compressive strength, resulting in durable and resilient structures.
| Test Item | Typical |
| SiO2 (%) | 92.91 |
| SO3 (%) | 0.48 |
| Cl (%) | 0.022 |
| MgO (%) | 0.66 |
| Al2O3 (%) | 0.81 |
| Fe2O3 (%) | 0.72 |
| K2O (%) | 1.06 |
| Na2O (%) | 0.1 |
| Free CaO (%) | 0.79 |
| PH | 7.09 |
| Moisture (%) | 0.3 |
| LOI (%) | 1.08 |
| Specific Surface (BET) (m2/g) | 21.33 |
| Activity Index (%) | 111 @ 7days |
| Retained on 45-μm (No.325) (%) | 1.33 |
| Fluidity (cm) | 20.02 |
Undensified silica fume improves compressive strength, bond strength, and abrasion resistance while reducing permeability in construction applications.
Undensified silica fume enhances the fluidity of refractory casting materials, and boosts compactness, high-temperature strength, and thermal shock resistance. It also reduces water consumption in refractory applications.
Undensified silica fume acts as a dispersant, replacing mica or diatomite to prevent fertilizer caking. It aids in producing potassium silicon compound fertilizers and protects soil from erosion or deterioration.
With strong adsorbability and large specific surface area, undensified silica fume serves as an anti-caking or pellet-binding agent, improving economic performance.
Construction
Refractory
Fertilizer
Pesticide
Extinguishant
Pellet binder
Insulating material, waterproof material, paint, coating, printing industry, etc.
