Overview
White microsilica, also known as silica fume, is a byproduct of silicon and ferrosilicon alloy production. It consists of extremely fine, amorphous silicon dioxide particles with high surface area and reactivity. Due to its unique properties, it is widely used in construction, ceramics, and other industrial applications. Unlike gray microsilica, the white variant is processed to remove impurities, resulting in a cleaner, more uniform product. This makes it particularly suitable for applications where color consistency is critical, such as in high-performance concrete and specialty coatings.
Physical and Chemical Properties
White microsilica is characterized by its ultra-fine particle size, typically ranging from 0.1 to 0.5 microns. This fine structure contributes to its high pozzolanic activity, enabling it to react with calcium hydroxide in cement to form additional cementitious compounds. The material is chemically inert under normal conditions, with high thermal stability and resistance to acids and alkalis. Its low carbon content (<1%) distinguishes it from standard silica fume, making it ideal for applications requiring minimal contamination.
Main Applications
In the construction industry, white microsilica is primarily used as a concrete additive to enhance strength, durability, and impermeability. It reduces porosity and improves resistance to chemical attack, making it valuable for marine structures and industrial flooring. Beyond construction, it serves as a filler in ceramics, a rheology modifier in coatings, and a raw material for refractory products. Its high purity also makes it suitable for electronic components and specialty glass production.
Safety and Storage
While white microsilica is non-toxic, its fine particles can pose respiratory hazards if inhaled. Proper handling with NIOSH-approved dust masks and adequate ventilation is essential. Skin contact should be minimized using gloves and protective clothing. Storage requires dry conditions to prevent clumping. Bulk bags or sealed containers are recommended, with palletized storage to avoid moisture absorption from floors. Shelf life is virtually unlimited if kept dry.
B2B Procurement Guide
When sourcing white microsilica, prioritize suppliers with ISO certification and consistent quality control. Key specifications to verify include SiO₂ content (typically >92%), moisture content (<1.5%), and loss on ignition (<3%). Consider logistical factors like packaging options (bulk bags vs. smaller containers) and the supplier's ability to provide technical data sheets and material safety documentation. For large projects, request samples to test compatibility with your specific application.
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