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High purity Al₂O₃ alumina ceramic material
Excellent electrical insulation and safety protection
CNC machined for accurate dimensions and consistency
High temperature, wear and corrosion resistant
Custom sizes and structures available
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089
HaoRui
custom01001
This alumina ceramic contact protection block is manufactured from high-purity aluminum oxide (Al₂O₃), designed to provide reliable electrical insulation and physical shielding in electrical and automation equipment.
The component features a precision-machined structure used to separate, block, or protect live electrical contacts, reducing the risk of short circuits and improving operational safety.
Processed by CNC machining and fine grinding after sintering, the alumina ceramic block offers accurate dimensions, stable quality, and excellent repeatability for series production.
Alumina ceramic provides strong electrical insulation, high dielectric strength, good thermal stability, and resistance to wear and chemical corrosion. These properties make it suitable for use in high-voltage, high-temperature, or harsh industrial environments.
Typical applications include electrical cabinets, power equipment, automation systems, industrial connectors, and other devices requiring reliable electrical isolation and protection.
Custom dimensions, structures, and tolerances can be manufactured according to customer drawings or technical requirements.
Custom alumina ceramic parts | CNC precision machining | Engineering support | Strict QC | On-time delivery
Custom Ceramic Manufacturing
OEM & ODM alumina ceramic parts according to drawings or samples.
Precision Machining Capability
CNC machining, drilling, grinding, and polishing with tight tolerances.
Engineering Support
Technical assistance for material selection, structure optimization, and manufacturability.
Strict Quality Control
Full inspection during production to ensure dimensional accuracy and stable quality.
Reliable Delivery & Support
Stable production capacity, on-time delivery, and professional communication.
Shenzhen Haorui Industrial Technology Co., Ltd. is a professional manufacturer of advanced engineering ceramic components, with 19 years of industry experience since its establishment in June 2006. Haorui specializes in the precision machining of zirconia ceramic and alumina ceramic structural parts, serving demanding applications in the semiconductor and optical fiber communication industries. With in-house CNC machining, precision grinding, fine polishing and strict inspection processes, we are capable of producing high-precision ceramic components with tight tolerances and stable dimensional accuracy. Our engineering ceramic products are widely used in semiconductor equipment, fiber optic fusion splicers, optical fiber alignment systems, microelectronic devices and precision optoelectronic equipment, where material purity, machining accuracy and long-term stability are critical. Haorui supports OEM & ODM customization, accepting CAD / STEP / PDF drawings, and provides reliable solutions from prototype development to mass production. Backed by a complete quality management system and experienced technical team, we deliver zirconia ceramic structural components with excellent wear resistance, low particle generation and high consistency, suitable for cleanroom and precision environments. Over the past 19 years, Haorui has served more than 1,000 customers worldwide and maintained close cooperation with over 30 universities and research institutions, earning a strong reputation for precision, reliability and professional service in the advanced ceramics industry.
Yes, we could offer the sample for free charge but do not pay the cost of freight.
3.Why should you buy from us not from other suppliers?
4.Are you a factory or a trading company?
5.Do you only supply standard parts or can customized parts according to our drawing?
6.Can I visit your factory?
7.How can we guarantee quality?
8.What services can we provide?
19+ years of engineering ceramic manufacturing experience
In-house CNC machining and inspection
Stable supply for semiconductor-grade ceramic parts
Professional technical communication and fast response
Properties of Alumina material (Al2O3)
| Property | Item | 95% Al2O3 | 99% Al2O3 | 99.8%Al2O3 | Unit |
| Mechanical Characteristics | Color | White | light yellow | Ivory | |
| Bulk Density | 3.7 | 3.85 | 3.93 | g/cm3 | |
| Water Absorption | 0 | 0 | 0 | % | |
| Bending Strength | 300 | 310 | 370 | MPa | |
| Compressive Trength | 2,300 | 2,400 | 2500 | MPa | |
| Elastic Modulus | 320 | 340 | 390 | GPa | |
| Fracture Toughness | 3~4 | 3~4 | 4 | MPa m1/2 | |
| Weber Coefficient | 12 | 12 | 12 | m | |
| Vickers Hardness | 1,400 | 1,600 | 1850 | HV 0.5 | |
| Thermal Characterics | Coefficient of Line Thermal Expansion | 7~8 | 7~8 | 7~8 | 10-6 K-1 |
| Thermal Conductivity | 20 | 29 | 32 | W/mK | |
| Thermal Shock Resistance (Put in Water) | 250 | 200 | 280 | ΔT °C | |
| Max Working Temperature | 1,500 | 1,600 | 1700 | °C | |
| Electrical Characteristics | Volume Resistance At 20°C | >1014 | >1014 | >1014 | Ωcm |
| Dielectric Strength | 15×106 | 15×106 | 15×106 | V/m | |
| Dielectric Constant | 9 | 10 | 10 | εr | |
| One MHZ Dielectric Loss Angle at 20°C | 0.0004 | 0.0002 | 0.0001 | tanδ | |
| Chemical Characteristics | Nitric Acid (60%) 90°C | 0.1 | 0.1 | 0.05 | 24H WT Loss mg/cm2 |
| Sulphuric Acid (95%) 95°C | 0.3 | 0.34 | 0.22 | ||
| Caustic Soda (30%) 80°C | 0.9 | 0.95 | 0.04 |
This alumina ceramic contact protection block is manufactured from high-purity aluminum oxide (Al₂O₃), designed to provide reliable electrical insulation and physical shielding in electrical and automation equipment.
The component features a precision-machined structure used to separate, block, or protect live electrical contacts, reducing the risk of short circuits and improving operational safety.
Processed by CNC machining and fine grinding after sintering, the alumina ceramic block offers accurate dimensions, stable quality, and excellent repeatability for series production.
Alumina ceramic provides strong electrical insulation, high dielectric strength, good thermal stability, and resistance to wear and chemical corrosion. These properties make it suitable for use in high-voltage, high-temperature, or harsh industrial environments.
Typical applications include electrical cabinets, power equipment, automation systems, industrial connectors, and other devices requiring reliable electrical isolation and protection.
Custom dimensions, structures, and tolerances can be manufactured according to customer drawings or technical requirements.
Custom alumina ceramic parts | CNC precision machining | Engineering support | Strict QC | On-time delivery
Custom Ceramic Manufacturing
OEM & ODM alumina ceramic parts according to drawings or samples.
Precision Machining Capability
CNC machining, drilling, grinding, and polishing with tight tolerances.
Engineering Support
Technical assistance for material selection, structure optimization, and manufacturability.
Strict Quality Control
Full inspection during production to ensure dimensional accuracy and stable quality.
Reliable Delivery & Support
Stable production capacity, on-time delivery, and professional communication.
Shenzhen Haorui Industrial Technology Co., Ltd. is a professional manufacturer of advanced engineering ceramic components, with 19 years of industry experience since its establishment in June 2006. Haorui specializes in the precision machining of zirconia ceramic and alumina ceramic structural parts, serving demanding applications in the semiconductor and optical fiber communication industries. With in-house CNC machining, precision grinding, fine polishing and strict inspection processes, we are capable of producing high-precision ceramic components with tight tolerances and stable dimensional accuracy. Our engineering ceramic products are widely used in semiconductor equipment, fiber optic fusion splicers, optical fiber alignment systems, microelectronic devices and precision optoelectronic equipment, where material purity, machining accuracy and long-term stability are critical. Haorui supports OEM & ODM customization, accepting CAD / STEP / PDF drawings, and provides reliable solutions from prototype development to mass production. Backed by a complete quality management system and experienced technical team, we deliver zirconia ceramic structural components with excellent wear resistance, low particle generation and high consistency, suitable for cleanroom and precision environments. Over the past 19 years, Haorui has served more than 1,000 customers worldwide and maintained close cooperation with over 30 universities and research institutions, earning a strong reputation for precision, reliability and professional service in the advanced ceramics industry.
Yes, we could offer the sample for free charge but do not pay the cost of freight.
3.Why should you buy from us not from other suppliers?
4.Are you a factory or a trading company?
5.Do you only supply standard parts or can customized parts according to our drawing?
6.Can I visit your factory?
7.How can we guarantee quality?
8.What services can we provide?
19+ years of engineering ceramic manufacturing experience
In-house CNC machining and inspection
Stable supply for semiconductor-grade ceramic parts
Professional technical communication and fast response
Properties of Alumina material (Al2O3)
| Property | Item | 95% Al2O3 | 99% Al2O3 | 99.8%Al2O3 | Unit |
| Mechanical Characteristics | Color | White | light yellow | Ivory | |
| Bulk Density | 3.7 | 3.85 | 3.93 | g/cm3 | |
| Water Absorption | 0 | 0 | 0 | % | |
| Bending Strength | 300 | 310 | 370 | MPa | |
| Compressive Trength | 2,300 | 2,400 | 2500 | MPa | |
| Elastic Modulus | 320 | 340 | 390 | GPa | |
| Fracture Toughness | 3~4 | 3~4 | 4 | MPa m1/2 | |
| Weber Coefficient | 12 | 12 | 12 | m | |
| Vickers Hardness | 1,400 | 1,600 | 1850 | HV 0.5 | |
| Thermal Characterics | Coefficient of Line Thermal Expansion | 7~8 | 7~8 | 7~8 | 10-6 K-1 |
| Thermal Conductivity | 20 | 29 | 32 | W/mK | |
| Thermal Shock Resistance (Put in Water) | 250 | 200 | 280 | ΔT °C | |
| Max Working Temperature | 1,500 | 1,600 | 1700 | °C | |
| Electrical Characteristics | Volume Resistance At 20°C | >1014 | >1014 | >1014 | Ωcm |
| Dielectric Strength | 15×106 | 15×106 | 15×106 | V/m | |
| Dielectric Constant | 9 | 10 | 10 | εr | |
| One MHZ Dielectric Loss Angle at 20°C | 0.0004 | 0.0002 | 0.0001 | tanδ | |
| Chemical Characteristics | Nitric Acid (60%) 90°C | 0.1 | 0.1 | 0.05 | 24H WT Loss mg/cm2 |
| Sulphuric Acid (95%) 95°C | 0.3 | 0.34 | 0.22 | ||
| Caustic Soda (30%) 80°C | 0.9 | 0.95 | 0.04 |
