Overview
Highly reactive microsilica, also known as silica fume, is a byproduct of silicon and ferrosilicon alloy production. It consists of ultrafine particles of amorphous silicon dioxide (SiO₂) and is prized for its high reactivity and pozzolanic properties. Microsilica is widely used in industries requiring enhanced material performance, such as construction and ceramics. Its fine particle size and high surface area contribute to improved mechanical properties in composite materials.
Physical and Chemical Properties
Microsilica appears as a fine gray or white powder with a typical particle size of less than 1 micron. Its high surface area (15-30 m²/g) and amorphous structure give it exceptional reactivity. The material is chemically inert under normal conditions but reacts with calcium hydroxide in the presence of moisture to form calcium silicate hydrate (C-S-H), which enhances the strength and durability of concrete. It is insoluble in water and most acids.
Main Applications
The primary use of microsilica is as a concrete admixture, where it significantly improves compressive strength, abrasion resistance, and chemical durability. It is also used in refractory materials to enhance thermal stability and in ceramics to improve sintering properties. Other applications include use in grouts, mortars, and high-performance coatings. Its ability to fill voids between cement particles makes it invaluable for producing ultra-high-performance concrete (UHPC).
Safety and Storage
Microsilica poses a respiratory hazard if inhaled, so proper protective equipment such as masks and gloves should be used during handling. It should be stored in a dry, well-ventilated area to prevent moisture absorption. Spills should be cleaned up promptly to avoid dust generation. In case of eye contact, rinse immediately with water and seek medical attention if irritation persists.
B2B Procurement Guide
When procuring microsilica, verify the product's purity, particle size distribution, and reactivity. Reputable suppliers should provide certificates of analysis (CoA) and material safety data sheets (MSDS). Consider logistics and storage requirements, as microsilica is typically shipped in bulk bags or smaller containers. Pricing varies based on purity and quantity, with bulk purchases often offering cost advantages.
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