400 mesh fused silica powder (particle size approx. 18-24 microns) further increases the fineness on the basis of the 300 mesh product, thus allowing for a more refined division in performance and application fields. Finer particles mean that they can be packed more densely per unit volume and have a larger contact area with the matrix.
This characteristic makes it perform well in electronic packaging and insulating materials requiring more balanced performance. Compared with the 300 mesh product, while maintaining good fluidity, it can provide higher mechanical strength and a lower coefficient of thermal expansion. For example, in the packaging of small and medium-power electronic components, insulator casting, and certain types of CCL, 400 mesh fused silica powder can provide a perfect performance balance: sufficient fluidity to ensure smooth production processes, while providing electrical and thermal properties that meet product design requirements. In advanced refractory castables, finer particles contribute to densification during the sintering process, improving the strength and service life of the product. It is also commonly used in ceramic glazes requiring higher surface smoothness. 400 mesh fused silica powder is a very flexible "balanced" product.
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