Spherical Alumina Filler α‑Al₂O₃ CAS 1344‑28‑1, D50 6.4μm for High‑Thermal Resin CPO & Automotive Electronics
Spherical α‑Al₂O₃ filler, CAS 1344‑28‑1, D50 6.4μm. Produced via high‑temperature spheronization and multi‑stage air classification, featuring stable alpha‑phase crystal structure and smooth spherical particle morphology. This thermally conductive inorganic filler establishes continuous heat‑transfer networks within resin matrix. It is applied in high‑thermal resin systems, CPO advanced semiconductor packaging and automotive electronics composites to enhance heat dissipation and improve long‑ter
Product Detail PageSpherical Alumina Filler α‑Al₂O₃ CAS 1344‑28‑1, D50 6.4μm for High‑Thermal Resin CPO & Automotive ElectronicsThis spherical α‑alumina filler is manufactured by high‑temperature melting, spheronization and precise air classification. The alpha‑phase crystal structure provides inherent high thermal conductivity, high hardness and excellent thermal stability. The median particle size D50 is tightly controlled at 6.4 μm, and rigorous classification removes oversized coarse particles to mitigate abrasive wear to mixing equipment, extrusion screws and molding molds during compounding operations.
The smooth spherical particle surface reduces inter‑particle friction inside molten or liquid resin. Compared with irregular crushed alumina powders, this spherical grade supports higher filler loading while restraining sharp viscosity rise of resin slurry. Increased filling content builds interconnected thermal conduction pathways, which effectively raises bulk thermal conductivity of cured resin composites.
In CPO semiconductor packaging high‑thermal resin formulations, this alumina filler dissipates localized hot‑spot heat from high‑power chips. It moderates thermal‑mechanical stress induced by repeated temperature cycling, lowering risks of delamination and micro‑crack formation inside the encapsulation structure. Strict control over alkali‑metal and ionic impurities minimizes electrochemical migration hazards, ensuring reliable insulation performance for high‑density semiconductor packages.
For automotive electronics applications, the filler is incorporated into thermal‑conductive potting resins and structural composite components. Automotive electronic assemblies undergo broad temperature swings, vibration and humid environments; this alumina‑filled resin composite maintains stable thermal dissipation and dimensional performance to satisfy stringent long‑life requirements of on‑board electronic modules.
The base alumina filler shows good compatibility with epoxy, silicone and various thermoset resin matrices. Custom silane surface modification can be implemented to improve interfacial bonding between alumina particles and polymer resin, reducing interfacial thermal resistance and enhancing composite mechanical strength as well as moisture‑resistant properties. It can be blended with finer or coarser spherical alumina fractions to achieve graded particle‑size distribution, maximizing filler loading for customized high‑thermal resin recipes for CPO and automotive electronics.
The powder product must be sealed and stored under low‑humidity conditions to prevent moisture absorption before compounding. Cross‑contamination with crushed angular alumina should be prevented during weighing, conveying and feeding processes. This D50 6.4 μm spherical α‑alumina filler acts as a premium thermally‑conductive inorganic filler for high‑thermal resin, CPO semiconductor packaging and automotive electronic thermal‑management materials.
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