Microsilica / Silica Fume

CAS No.: 69012-64-2

Main Component: Amorphous silica (SiO₂)

Content typically ≥85%～98%

Source: Ultrafine dust recovered during industrial silicon or ferrosilicon alloy smelting

Particle Size: Extremely fine, 0.1～0.3 μm, approximately 100 times finer than cement

Appearance: Gray or off-white powder

Applications of microsilica

1. Concrete and Construction Engineering (Most Mainstream)

High-strength/High-performance Concrete: Improves strength, density, and impermeability.

Marine/Port/Tunnel Concrete: Enhances resistance to chloride ions and corrosion.

Hydraulic Dams, Bridges, and High-speed Railway Projects: Enhances durability and freeze-thaw resistance.

Self-leveling Concrete and Shotcrete: Improves fluidity and reduces rebound.

2. Refractory Materials Industry

Used in monolithic refractories, castables, and precast components.

Improves high-temperature strength, erosion resistance, spalling resistance, and high-temperature corrosion resistance.

Widely used in blast furnaces, electric furnaces, kilns, and metallurgical linings.

3. Building Materials and Mortar

High-strength cement-based grouting materials, repair mortars, and floor mortars.

Improves early strength, wear resistance, crack resistance, and impermeability.