This insulating ceramic sleeve is made from 99% high-purity alumina ceramic (Al₂O₃). It is designed for applications where stable electrical insulation, heat resistance, and reliable ceramic protection are required. Compared with standard alumina grades, 99% alumina provides better insulation stability and is suitable for precision electrical parts, high-temperature equipment, and clean working environments.
This 99% alumina insulating ceramic sleeve is commonly used in electrical equipment, high-voltage insulation systems, heating equipment, vacuum devices, semiconductor-related fixtures, laser equipment, precision instruments, and electronic assemblies. It is a suitable choice when the part needs to provide insulation, protect components, or remain stable in high-temperature and demanding working conditions.
Standard sizes usually take 10–20 days. For custom dimensions, tight tolerances, special surface finishes, or complex structures, the delivery time will be confirmed based on your drawings, quantity, and processing requirements. You can also send us your drawing for a quick review.
This 99% high-purity alumina insulating ceramic sleeve is used for electrical insulation, high temperature resistance, and mechanical protection in high-voltage equipment, heating systems, vacuum devices, laser equipment, precision instruments, and electronic assemblies.
Made from dense 99% alumina ceramic, it offers stable insulation performance, good hardness, and reliable dimensional stability. The sleeve can be used as an alumina ceramic insulator sleeve, ceramic spacer, protective tube, or custom ceramic insulating component according to the drawing and assembly design.
CERAMPRO can manufacture custom alumina ceramic sleeves based on drawings or samples, including ID, OD, length, wall thickness, chamfer, tolerance, and surface finish. You can send us your drawing for a technical review.
This product is made from 99% high-purity alumina ceramic, also known as Al2O3 ceramic. Compared with standard alumina grades, 99% alumina is often selected for applications that require better insulation stability, higher operating temperature resistance, and cleaner working environments.
For applications that require a more cost-effective sleeve or bushing for general mechanical use, you may also view our 96% alumina ceramic sleeve / bushing.
This 99% alumina ceramic sleeve is suitable for equipment where insulation stability, heat resistance, and dimensional reliability are important. It can be customized for different electrical, thermal, vacuum, and precision assembly requirements.
For thermocouple-related applications, you may also check our alumina ceramic insulator for Type K thermocouple sensors or our 99% high-purity multi-bore alumina thermocouple insulator tube.
The following data is for reference only. Actual performance may vary depending on part size, structure, processing method, and operating conditions.
| Parameter | Typical Value | Functional Significance |
|---|---|---|
| Material Content | ≥ 99% Al2O3 | High alumina purity supports stable insulation and thermal performance. |
| Dielectric Strength | 18–22 kV/mm | Suitable for many electrical insulation and high-voltage applications. |
| Volume Resistivity | > 1014 Ω·cm @ 20°C | Helps maintain insulation performance in precision assemblies. |
| Max Service Temperature | Up to 1650°C | Suitable for high-temperature use under appropriate operating conditions. |
| Thermal Conductivity | 30–33 W/(m·K) | Provides stable thermal behavior for ceramic insulation and protection parts. |
| Density | 3.85–3.92 g/cm³ | Dense ceramic structure supports mechanical strength and low-porosity performance. |
| Dielectric Constant | 9.6–10.1 @ 1 MHz | Provides predictable electrical performance for insulation-related applications. |
| Hardness | Approx. 18 GPa | Good hardness helps resist wear and surface damage during assembly and operation. |
It is mainly used for electrical insulation, high temperature resistance, spacing, and ceramic protection in high-voltage equipment, heating systems, vacuum devices, laser equipment, electronic assemblies, and precision instruments.
99% alumina is usually selected when the application requires higher insulation stability, better high-temperature resistance, and cleaner working conditions. 96% alumina ceramic is often used when cost efficiency and general mechanical performance are the main priorities.
Yes. We can customize the inner diameter, outer diameter, length, wall thickness, chamfer, tolerance, surface finish, and other details according to your drawings or samples.
Yes. 99% alumina ceramic has good dielectric strength and high volume resistivity, making it suitable for many high-voltage and electronic insulation applications.
Yes. 99% alumina ceramic is suitable for many high-temperature operating environments. The final operating temperature should be confirmed according to the part design, installation method, and actual application conditions.
Common surface options include as-sintered, ground, polished, chamfered, or custom-machined finishes. The best option depends on the required fitting, insulation performance, and drawing specifications.
Yes. Dense 99% alumina ceramic is often used in vacuum and clean equipment applications. For strict vacuum or cleanliness requirements, the material grade, machining process, and cleaning method should be confirmed before production.
Please provide drawings or samples, material requirements, dimensions, tolerances, quantity, surface finish, operating temperature, voltage requirement, and application environment. This helps us review the part more accurately.
No. This product is positioned as a general 99% alumina insulating ceramic sleeve for electrical, high-temperature, vacuum, laser, and precision equipment applications. If you need ceramic parts for thermocouple sensors, please choose a thermocouple-specific alumina ceramic insulator product.
Standard sizes usually take 10–20 days. Custom sizes, tight tolerances, special surface finishes, or complex structures will be confirmed based on drawings, quantity, and processing requirements.
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