Nano Spherical Silica Powder
Overview
Nano Spherical Silica Powder is a synthetic silica material characterized by its spherical particle shape and nanoscale dimensions (typically 20–100 nm). It is produced through advanced processes like flame hydrolysis or sol-gel methods, ensuring high purity (>99.9%) and uniformity. Due to its unique morphology and chemical inertness, it is widely adopted in high-tech industries such as electronics, where it enhances mechanical and thermal properties of composites. Its spherical shape reduces viscosity in formulations, making it ideal for precision applications like semiconductor encapsulation.
Physical and Chemical Properties
The powder exhibits a high surface area (50–400 m²/g) and low bulk density, contributing to its reactivity and dispersibility. Its amorphous structure ensures thermal stability up to 1,600°C, with a low coefficient of thermal expansion (0.5 × 10⁻⁶/°C). Chemically, it is inert to most solvents except hydrofluoric acid. Surface modifications (e.g., silane treatment) can tailor its hydrophobicity or compatibility with polymers, expanding its utility in coatings and adhesives.
Main Applications
In electronics, it serves as a filler in epoxy resins for integrated circuit packaging, reducing stress and improving thermal conductivity. The automotive industry uses it in tire formulations to enhance abrasion resistance. Its optical properties make it suitable for anti-reflective coatings and LED encapsulants. Additionally, it is employed in cosmetics (e.g., sunscreens) for its UV-blocking ability and smooth texture.
Safety and Storage
While non-toxic, nano silica requires handling precautions due to its fine particle size, which can pose inhalation risks. Use NIOSH-approved respirators and ensure adequate ventilation during processing. Store in sealed containers away from moisture to prevent agglomeration. Bulk storage should avoid static buildup to minimize explosion hazards. Spills should be cleaned with wet methods to avoid dust dispersion.
B2B Procurement Guide
Buyers should prioritize suppliers with ISO certification and batch-to-batch consistency guarantees. Key specifications include particle size distribution (D50), surface area, and impurity levels (e.g., Na⁺ < 50 ppm). For coatings or adhesives, request surface-treated variants (e.g., amino or epoxy-functionalized) to ensure compatibility. Sample testing is recommended to verify performance in end-use formulations. MOQs typically start at 1 kg for R&D and 100 kg for industrial-scale orders.
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