Overview
Spherical silica sand is a high-purity quartz powder processed into spherical particles through advanced flame fusion or plasma methods. It is characterized by its uniform particle size, smooth surface, and excellent flowability, making it superior to irregularly shaped quartz powder in many industrial applications. The spherical shape reduces internal stress in composite materials and improves packing density, which is critical for applications in electronics and coatings. Its high chemical stability and thermal resistance further enhance its utility in demanding environments.
Physical and Chemical Properties
Spherical silica sand exhibits a high melting point (~1700°C) and low thermal expansion coefficient, making it suitable for high-temperature applications. Its spherical morphology ensures minimal abrasion to equipment and improved dispersion in matrices. Chemically, it is inert to most acids (except hydrofluoric acid) and alkalis, with a purity level often exceeding 99.9%. The particle size typically ranges from 1 to 100 microns, with tight distribution controls for specific applications.
Main Applications
In electronics, spherical silica sand is widely used as a filler in epoxy molding compounds (EMCs) for semiconductor encapsulation, where its low thermal expansion and high dielectric strength are critical. It also serves as a functional additive in coatings to enhance hardness and weather resistance. Other applications include advanced ceramics, where it improves sintering performance, and composite materials, where it reinforces mechanical properties while maintaining lightweight characteristics.
Safety and Storage
While spherical silica sand is non-toxic, prolonged inhalation of fine particles may cause respiratory irritation. PPE such as dust masks and goggles is recommended during handling. Storage should avoid humid environments to prevent clumping. Bulk shipments require moisture-proof packaging, and containers should be sealed tightly after use. Spills should be cleaned promptly with vacuum equipment to minimize airborne dust.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO-certified production facilities to ensure consistent quality. Key specifications to verify include SiO2 content (≥99.9%), sphericity rate (≥90%), and particle size distribution (D50 typically 5-30µm). Sample testing is recommended to confirm compatibility with the intended application. Large-volume buyers may negotiate tiered pricing, with MOQs commonly starting at 1 ton. Lead times vary but generally range from 2-6 weeks for custom grades.
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