Multi‑Modal Spherical Fused Silica Powder Blend CAS 7631‑86‑9 is a homogeneous physical mixture of three distinct spherical fused silica particle fractions (coarse, medium, fine). Each individual fraction is manufactured via flame spheroidization, classification and purification before precise proportion blending. The ternary particle‑size grading achieves maximum packing density. It is specially developed for epoxy molding compound (EMC). The blended filler permits ultra‑high filler loading, lo

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Multi‑Modal Spherical Fused Silica Powder Blend CAS 7631‑86‑9, Ternary Particle Size Distribution for Maximum Packing & Low‑Expansion EMC

This multi‑modal spherical fused silica powder blend is produced by independently manufacturing coarse, medium and fine spherical fused silica fractions through high‑temperature flame spheroidization, air classification and purification. Each fraction is tested for particle‑size distribution, sphericity and impurity levels. Afterwards, the three fractions are metered according to optimized formulation ratios and homogenously blended under controlled low‑shear mixing conditions. No chemical reaction occurs during blending; the final product remains amorphous SiO₂ spherical particle physical blend with designed ternary particle‑size distribution.

For single‑size silica filler systems, the void spaces between large particles cannot be effectively filled, which restricts the maximum achievable filler loading within epoxy resin. In this ternary multi‑modal blend, coarse spherical particles form the primary skeleton structure. Medium‑sized particles occupy the interstices among coarse beads, while fine particles further fill the residual micro‑voids. This sequential space‑filling mechanism delivers maximum theoretical packing density of inorganic powder. Higher total filler loading can be accomplished without an excessive sharp rise in EMC melt viscosity during compounding.

When applied for semiconductor EMC epoxy molding compound, the ultra‑high silica loading reduces the resin volume fraction inside the cured molding compound. It lowers the overall coefficient of thermal expansion of EMC material, alleviating thermal‑induced internal stress between silicon die, lead‑frame and molding resin during molding, post‑curing and thermal cycling. Consequently, the risks of package warpage, delamination and popcorn failure during reflow soldering are significantly decreased. The blended silica retains good melt flow behavior for transfer‑molding processes, which is critical for molding thin, compact semiconductor packages.

Trace metallic ion impurities of each starting silica fraction are strictly controlled to meet electronic‑grade requirements, restraining electrochemical‑migration and leakage‑current failure modes inside encapsulated microelectronic devices. This multi‑modal blend can be further processed with silane surface modification upon request to improve interfacial bonding between silica particles and epoxy resin matrix.

Special processing precautions are required during EMC kneading. Intense, long‑duration high‑shear kneading should be avoided. Severe mechanical force will fracture spherical particles, destroy the carefully designed ternary particle‑size gradation, increase specific surface area, and cause unexpected viscosity elevation of the EMC compound. Filler loading for EMC formulation still needs laboratory trials; maximum packing potential does not mean unlimited loading. Excessive filling will deteriorate melt flow and lead to incomplete mold filling during transfer molding.

The blended powder shall be packed in sealed moisture‑proof containers and stored in a dry warehouse. Vibration during transportation may cause particle segregation of coarse‑fine fractions. Periodic inspection and gentle re‑homogenization before feeding are recommended. Cross‑contamination with non‑graded single‑modal silica should be prevented in warehouse and feeding systems. This multi‑modal ternary‑graded spherical fused silica powder blend is a high‑performance mineral filler dedicated to high‑loading, low‑expansion EMC semiconductor encapsulation formulations.

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Jishengya Technology

Shenzhen Jishengya Technology Co., Ltd. is located in Shenzhen, a special economic zone, and is a comprehensive technology enterprise integrating independent R&D, production and sales.