Alumina ceramic components

Product Positioning
Precision ceramic insulating components and bushings engineered for high-temperature, high-voltage electrical insulation and heavy-wear working conditions. Manufactured with high-purity alumina (Al₂O₃) as the base material, the product adopts axial/annular parallel precision structural design, produced via advanced forming processes followed by precision outer circle and inner bore grinding. It delivers physical isolation solutions featuring ultra-high hardness, resistance to mechanical erosion, ultra-high temperature tolerance and full electrical insulation for semiconductor etching equipment, medical instruments, precision mechanical transmission and power electronics processes.

Core Selling Points 
1. Superior Electrical Insulation with Stable Performance Under High Temperature & High Frequency
Ultra-high volume resistivity (＞10¹⁴ Ω·cm at 500℃) and dielectric breakdown strength ≥ 25 kV/mm, with insulation performance far superior to conventional materials.
Dielectric constant maintained at 9–10 (1 MHz) with extremely low dielectric loss under high-frequency operation, eliminating risks of electric leakage and arc breakdown.
Key Advantage: Alumina boasts outstanding insulation stability at high temperatures. For operating temperatures above 800℃, its electrical isolation capacity greatly outperforms zirconia, which becomes more conductive with rising heat. It is the only reliable material for insulating cores and core insulating sleeves.
2. Precision Small Bore Machining & Concentricity Control for Fine Wire & Precision Assembly
Inner bore and wall thickness are controlled to micron-level precision; minimum stable machinable wall thickness reaches 0.15 mm to effectively save assembly space.
Smooth inner bore surface free of burrs and flashes enables unobstructed wire threading without jamming, fully protecting signal wire insulation jackets from scratch damage caused by friction.
Customer Value: For space-constrained sensors and precision electronic assemblies, the integrated small-bore thin-wall design cuts installation space by over 50%, enabling lighter weight and more compact overall equipment structures.
3. Excellent Thermal Stability with Heat Resistance up to 1600℃–1750℃
Made of 95%–99%+ high-purity alumina, it supports long-term continuous operation at 1600℃–1750℃ without changes to physical and chemical properties.
Low thermal expansion coefficient of only 6.5×10⁻⁶/℃ delivers good compatibility with various industrial metals and exceptional thermal shock resistance against rapid heating and cooling cycles.
Customer Value: When exposed to sustained high heat in industrial furnaces and glass melting kilns, components will not soften, creep or deform, perfectly safeguarding the operating precision of precision equipment and temperature measurement accuracy of sensors.
4. High Mechanical Compressive Strength, Ultra Wear & Erosion Resistance
Flexural strength ranges from 250–580 MPa, compressive strength hits 2100–3600 MPa, and Vickers hardness exceeds HV1500.
Its surface resists scratches under high-speed, high-frequency friction or particle erosion, with mating dimensions remaining stable without deformation.
Customer Value: Greatly reduces frequent production line downtime and component replacement caused by wear of shaft sleeves and gaskets, minimizing overall equipment maintenance costs.
5. High Chemical Inertness, Corrosion Resistance & Zero Contamination
Outstanding acid and alkali corrosion resistance, full protection against industrial corrosive gases and cleaning solutions, plus complete non-hygroscopic property.
Customer Value: In sensitive semiconductor, chemical processing and medical testing environments, it releases zero metal ion contaminants to avoid cross-contamination and guarantee stable high-purity production workflows.