Silica Fume is an ultra-fine, high-purity amorphous silica (SiO₂) material produced as a by-product of fused zirconia manufacturing. Characterized by its extremely small particle size and high surface area, it functions as a powerful pozzolanic additive that enhances the mechanical and rheological performance of concrete and refractory mixes. Its fine white appearance and chemical stability make it suitable for both structural and specialty industrial applications.
Material Characteristics
As a sub-micron powder with a specific surface area typically ranging from 7–14 m²/g, Silica Fume demonstrates excellent reactivity and blending behavior in cementitious systems. When incorporated into formulations, it improves packing density, reduces porosity, and increases both early and long-term strength while enhancing chemical resistance and overall durability.
- Composition: ≥ 98 % amorphous SiO₂ (non-crystalline form).
- Physical Form: Fine, white powder with average particle size below 1 μm.
- Key Attributes: High surface area, excellent flowability, and superior dispersibility.
Industrial Relevance
Silica Fume is widely used in high-performance concretes, refractory castables, and advanced ceramics where flowability, strength, and impermeability are critical. Its ability to improve microstructure and reduce permeability makes it an essential additive for applications exposed to aggressive thermal or chemical environments.
