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Premium Material Parameters
Made of standard high-purity alumina, our insulators feature accurate and stable physical indicators, including a volume density of 3.45 g/cm³ and zero water absorption.
Excellent Thermal Stability
With low thermal expansion coefficient and strong thermal shock resistance, they withstand continuous high-temperature operation and frequent cold-hot cycles without cracking or deformation.
Stable Electrical Insulation
With a stable dielectric constant of 10 (tested at 1MHz, 25℃), the dense ceramic structure provides high dielectric strength and low dielectric loss. It achieves reliable circuit isolation, effectively preventing current leakage and electric breakdown under high-voltage and high-frequency conditions.
Mechanical Strength & Customization
These insulators own superior mechanical properties with 300Mpa flexural strength and 1300 Vickers hardness. We support flexible OEM/ODM customization of sizes, special shapes, grooves and surface treatments to meet various precision assembly requirements.
1. Introduction on Alumina insulators
Alumina ceramic insulators are core structural and insulating components indispensable in modern precision electronic manufacturing, high-voltage power equipment, industrial automation systems, communication devices and new energy optoelectronic facilities. As a high-performance inorganic ceramic product, it is fabricated from high-purity alumina powder through scientific formula blending, isostatic pressing forming, ultra-high temperature sintering and precision post-processing. Featuring high material density, ultra-low porosity, uniform internal structure and stable physical and chemical attributes, this insulator outperforms traditional plastic, glass and ordinary low-grade ceramic insulating parts in comprehensive performance. It overcomes the inherent defects of conventional insulating materials, including poor temperature resistance, low mechanical rigidity, easy aging and insufficient voltage resistance. Capable of stable long-term operation in high-temperature, high-humidity, high-voltage and corrosive harsh environments, alumina ceramic insulators have become the most reliable insulating and supporting solution for high-end electronic and industrial electrical equipment worldwide.
2. Features of Alumina ceramic Insulator
2.1 Material
The product adopts strictly selected high-purity alumina raw materials with fine particle size and ultra-low impurity content, ensuring uniform texture and consistent performance of each finished insulator. The optimized industrial formula effectively improves the structural compactness and overall rigidity of the ceramic body, endowing the product with superior mechanical properties such as extreme hardness, strong compressive resistance, excellent wear resistance and structural impact resistance. During long-term high-frequency operation and repeated mechanical extrusion, friction and vibration, the insulator maintains complete structural stability without deformation, cracking or surface wear. In terms of electrical performance, high-purity alumina ceramic owns ultra-low dielectric loss and excellent dielectric strength, which can form stable and reliable electrical isolation between circuit units. It effectively blocks current leakage, prevents electric breakdown and arc discharge, and avoids short-circuit faults caused by insulation failure, fully guaranteeing the safe, stable and continuous operation of precision electronic modules, high-voltage power distribution equipment and industrial control systems.
2.2 Features
Our alumina ceramic insulators possess exceptional thermal stability and environmental adaptability, adapting to various extreme working conditions that ordinary insulating materials cannot withstand. The product has outstanding high-temperature resistance and thermal shock resistance, tolerating long-term continuous high-temperature operation and frequent cold-hot alternating cycles without structural warping, cracking or performance attenuation. Different from organic insulating materials that are prone to melting, aging and performance degradation under high temperature, alumina ceramic can maintain stable physical structure and electrical insulation performance in high-temperature working scenarios. Meanwhile, it features excellent moisture-proof, waterproof, anti-corrosion, anti-oxidation and anti-aging capabilities, effectively resisting erosion from humid air, industrial dust, chemical gas and corrosive liquid. Its superior weather resistance greatly prolongs the service life of matching electronic and electrical equipment, significantly reducing equipment failure rate, maintenance frequency and overall industrial operation costs for end users.
3. Manufacturing of Alumina ceramic
All our alumina ceramic insulators are manufactured via standardized, fully mature industrial production processes with strict full-process quality control. The complete production flow includes precise raw material screening and proportioning, uniform powder mixing, high-pressure isostatic forming, segmented high-temperature sintering, precise CNC fine grinding and surface finishing. Each processing link adopts standardized parameter control to eliminate performance differences between batches. Strict finished product inspection procedures including dimensional tolerance detection, flatness testing, insulation performance testing and structural defect screening are implemented before delivery. The final products feature ultra-precise dimensional accuracy, tight tolerance control, smooth and flat surface and high structural consistency, realizing zero-error seamless assembly and precise matching with various precision electronic components and electrical hardware. The standardized production system greatly improves product yield and batch stability, helping downstream manufacturing enterprises optimize assembly efficiency and reduce production costs.

4. Customization of Alumina ceramics
To meet the diversified and personalized application demands of different industries and special equipment scenarios, we provide full-range OEM and ODM one-stop customized services for alumina ceramic insulators. We support customized adjustment of multiple core parameters, including different alumina purity grades, non-standard outer diameters, inner apertures, lengths and thicknesses, as well as special-shaped structures such as multi-hole positioning, grooving and step surfaces. Professional surface processing services including fine polishing, glazing, metallization and insulation strengthening treatment are also available. Whether it is micro-miniature precision insulators for wearable electronic devices and miniature sensors or large-size structural insulating parts for industrial high-voltage power equipment, we can design and produce according to customer drawings, samples and technical requirements. Equipped with professional R&D teams, advanced production equipment and perfect quality inspection system, we support free technical solution evaluation, fast sample production, low MOQ trial order and stable mass delivery, providing reliable customized insulation component solutions for global customers in electronics, power, communication, automation, new energy and industrial manufacturing fields.
Product Parameter TableAlumina Purity |
92% |
95% |
96% |
99% |
99.6% |
Color |
White |
White |
White |
Ivory White |
White |
Volume density(g/cm3) |
3.45 |
3.5 |
3.7 |
3.75 |
3.9 |
Water Absorption |
0 |
0 |
0 |
0 |
0 |
Flexural Strength |
300Mpa |
300Mpa |
320Mpa |
330Mpa |
330Mpa |
Vickers hardness |
1300 |
1400 |
1400 |
1800 |
1800 |
Dielectric Constant (at 1MHZ 25℃) |
10 |
10 |
10 |
10 |
10 |
Modulus of elasticity |
350Gpa |
350Gpa |
350Gpa |
370Gpa |
370Gpa |
thermal conductivity (30℃) |
18W/M.K |
24W/M.K |
24W/M.K |
25W/M.K |
28W/M.K |
Volume resistivity |
10^14Ω•cm |
10^14Ω•cm |
10^14Ω•cm |
10^14Ω•cm |
10^15Ω•cm |
Dielectric strength |
20KV/mm |
20KV/mm |
20KV/mm |
20KV/mm |
30KV/mm |
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