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Product Specifications
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Chemical Composition
Chemical specifications for spherical alumina center on Al₂O₃ purity and key impurities (Na₂O, Fe₂O₃, SiO₂) . Purity grades span from industrial (≥99.8%) to high-purity (≥99.99%), with sodium content being a key differentiator among grades. Low-sodium products (Na⁺ controllable to single-digit ppm) are suited for ion-migration-sensitive electronic packaging systems.
The above chemical specifications synthesize published parameters for industrial-grade, high-purity, and low-sodium electronic-grade spherical alumina. High-purity spherical alumina with purity ≥99.99% is commercially available.
Production Specifications
The specification system for spherical alumina is built around three dimensions: particle size, purity, and surface treatment. Particle size is the core variable, directly linked to packing density, thermal network construction, and processing rheology. Multi-modal particle size blending (coarse particles forming a skeleton, fine particles filling voids) is a common industrial strategy for optimizing filling ratio and thermal conductivity.
The particle size specifications reference commercial spherical alumina product series (continuous coverage from 0.2 μm to 150 μm) and international manufacturers' submicron-to-100 μm product lines.
Application Scenarios
Applications of spherical alumina revolve around the advantages conferred by its spherical morphology—high filling, high flow, and low abrasion. Thermal management is currently the single largest application area, but advanced ceramics, abrasives/polishing, and composites also hold significant positions.
Thermal Management (Core Application):
Thermal Interface Materials (TIMs) : Thermal greases, pads, gels, potting compounds, and phase-change materials. The high filling capability of spherical alumina enables TIMs to achieve high thermal conductivity while maintaining workable viscosity, making it a critical filler for EV battery packs, 5G base stations, and power electronics cooling.
Thermally Conductive Engineering Plastics & Composites: LED housings, electronic enclosures, and heat-dissipating components, where spherical alumina imparts thermal conductivity and dimensional stability.
Thermally Conductive Aluminum-Based Copper Clad Laminates: High-power LED circuit substrates and power boards, utilizing spherical alumina to build an insulating thermally conductive layer.
Semiconductor Packaging: Epoxy molding compound (EMC) fillers. Low-alpha grades (U/Th ≤10 ppb) are used in advanced packaging for high-performance computing chips and HBM where soft-error susceptibility is a concern.
Advanced Ceramics & Refractories:
Precision Ceramics: Alumina ceramic filters, honeycomb ceramics, artificial corundum, and synthetic sapphire feedstock. Spherical particles promote uniform packing and pore structure control in green bodies.
Ceramic Sintering Release Powder: Spherical alumina serves as a mold-release or parting agent during ceramic sintering, reducing adhesion between bodies and setters.
Abrasives, Polishing & Surface Treatment:
Abrasive Media & Polishing Agents: For lapping and polishing of semiconductor wafers, electronic substrates, precision workpieces, and decorative items. The spherical morphology helps avoid scratching associated with irregular particles, yielding more uniform surface quality.
Blasting & Surface Finishing: As a blasting medium for surface cleaning and finishing.
Other Extended Applications:
Catalyst Supports: Spherical alumina can serve as a catalyst support, with the spherical shape promoting uniform reactor bed packing and pressure drop control.
Functional Coatings: Used in heat-dissipating and thermal-barrier coating systems.
Bioceramics: Nano spherical alumina can be used to manufacture artificial teeth and bone materials.
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FAQ
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Q1: Is your company a trading firm or a manufacturing plant? Where are your facilities located?
We are an export-oriented enterprise that integrates manufacturing and sales; we are not an intermediary. Our headquarters—handling international sales, order processing, documentation, and after-sales service—is located in the Liaocheng Economic and Technological Development Zone, serving as the hub for global client relations, order negotiations, and cross-border services. Our production facility is situated in Chiping District, Liaocheng City, and specializes in the R&D, smelting, processing, and testing of white fused alumina, brown fused alumina, and other fused alumina products. This allows us to manage the entire supply chain—from primary production and rigorous quality control to direct export.
Q2: What is your production capacity and supply capability? Can you ensure a stable, long-term supply?
Our production base in Chiping features mature production lines and comprehensive processing equipment, enabling large-scale, continuous manufacturing. We offer a stable supply of our full range of white fused alumina, brown fused alumina, and related fused alumina products. With ample inventory and well-organized production scheduling, we are fully equipped to handle bulk orders, recurring annual orders, and urgent requests during peak seasons, ensuring a reliable, long-term supply for our global clients.
Q3: What are your primary export products, and what are your core offerings?
Our core exports consist of three main series of fused alumina materials: brown fused alumina, white fused alumina, and other fused alumina products. We offer a comprehensive range of specifications and particle sizes that meet various international procurement standards. Brown fused alumina is our flagship product for cost-effective industrial abrasives and refractory raw materials; white fused alumina is designed for high-purity, high-precision grinding and polishing applications; and our broader fused alumina line serves high-end refractory, specialty ceramic, and precision abrasive tool sectors—covering the full spectrum of procurement needs across all market tiers.
Q4: What are the specific applications for these three types of fused alumina, and how should one choose the right product? 1. Brown Fused Alumina: Characterized by high toughness, excellent wear and impact resistance, and a strong price-performance ratio. It is suitable for general industrial applications such as metal sandblasting (rust removal), hardware grinding, the manufacturing of grinding wheels and sandpaper, metallurgical castable refractories, and lining materials for standard industrial furnaces. It serves as a versatile, all-purpose abrasive and refractory raw material.
2. White Fused Alumina: Features high purity, high hardness, and excellent self-sharpening properties, with a pure white appearance free from impurities. It is ideal for high-precision and high-cleanliness applications, including the polishing of precision molds, grinding of aerospace components, finishing of electronic materials, and the production of high-end refractory products and precision ceramics.
3. Fused Alumina (High-Purity/Specialized): Possesses a dense structure, exceptional thermal stability, and high resistance to both heat and corrosion. It serves as a core raw material for high-end, specialized refractories, structural ceramics, precision grinding media, and linings for high-temperature industrial kilns, making it well-suited for demanding, high-performance operating environments.
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