High-Purity Spherical Fused Silica Powder CAS 7631-86-9, SiO₂ ≥99.9% for Semiconductor EMC IC Packaging & Low-Expansion Resin
High‑Purity Spherical Fused Silica Powder CAS 7631‑86‑9 is produced by high‑temperature fusion, flame atomization and multi‑stage purification of premium quartz raw material. SiO₂ content reaches ≥99.9% with strictly restricted trace metallic impurities. The smooth spherical particle morphology provides good powder flow and favorable resin fluidity. It is applied as key mineral filler for semiconductor EMC IC packaging and low‑expansion epoxy resin, minimizing ionic contamination risk for sensit
High‑Purity Spherical Fused Silica Powder CAS 7631‑86‑9, SiO₂ ≥99.9% for Semiconductor EMC IC Packaging & Low‑Expansion Resin
This high‑purity spherical fused silica powder is fabricated by melting premium quartz feedstock at ultra‑high temperature, followed by flame atomization, air classification and rigorous multi‑step purification treatment. The finished particles are amorphous spherical silica. Strict purification workflow effectively reduces residual alkali metal, heavy‑metal and transition‑metal impurities. SiO₂ content is controlled above 99.9%, which distinguishes this grade from conventional general‑purpose fused silica.
Spherical particle shape lowers inter‑particle friction. When incorporated into epoxy resin systems, it helps maintain relatively low slurry viscosity even at high filler loading. The amorphous silica structure delivers a low coefficient of thermal expansion, which enables better thermal‑expansion matching between the cured resin matrix, silicon die and copper lead‑frame. It mitigates internal thermal stress generated during molding, post‑curing and temperature cycling of semiconductor packages, reducing the risk of package cracking, delamination and warpage.
For semiconductor EMC IC packaging, low metallic‑ion concentration is critical. Reduced ionic contamination suppresses electrochemical migration and leakage current inside the encapsulated microelectronic devices, improving long‑term electrical reliability of finished IC packages. This grade is suitable for mid‑range logic chips, power ICs and discrete semiconductor encapsulation. It is not formulated for ultra‑low‑alpha‑particle specification, so it is not the first selection for advanced HBM and CPO high‑density memory packaging.
Within low‑expansion epoxy resin applications, including precision electronic potting, structural epoxy composites and insulating casting resin, the high‑purity silica filler enhances compressive and flexural mechanical properties. It moderates the curing exothermic reaction of epoxy systems and decreases overall resin shrinkage during hardening, guaranteeing high dimensional accuracy for precision resin‑molded parts.
During compounding operations, sufficient mixing and dispersion are essential to break up soft agglomerates. Aggregated silica particles may trigger void formation inside the cured resin, which would weaken insulation performance and become potential failure points for semiconductor packages. Formulation engineers should adjust filler loading to strike a balance between filling level, system viscosity and mold flow performance for transfer molding processes.
Moisture absorption must be avoided before compounding. The powder shall be stored in tightly sealed, moisture‑proof bags or drums inside dry warehouse facilities. Strict segregation from lower‑purity silica grades is required during transportation, storage and feeding to eliminate cross‑contamination. This high‑purity spherical fused silica powder serves as a reliable high‑purity mineral filler for semiconductor EMC IC encapsulation and high‑performance low‑expansion resin formulations.
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High-Purity Spherical Fused Silica Powder CAS 7631-86-9, SiO₂ ≥99.9% for Semiconductor EMC IC Packaging & Low-Expansion Resin
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