Alumina Ceramic 95-99.8%

Capable of precision machining of shaped, round and curved ceramic components

As a widely used industrial ceramic, its purity ranges from 90% to over 99.8%. It is a highly durable material. The higher the purity, the better the performance. It has high hardness, wear resistance and chemical resistance. It is suitable for semiconductors, medical, automation and other fields

Alumina Advantages

Excellent biocompatibility
Strong electrical insulation properties
High chemical corrosion resistance.
Superior high-temperature stability and thermal shock resistance
Mohs hardness up to 9, with high hardness and mechanical strength
Capable of withstanding large mechanical loads
Low thermal expansion coefficient and specific thermal conductivity rates
Excellent thermal conductivity and antioxidant performance
Wear and abrasion resistant
Transparent to microwave radio frequencies
High compressive and dielectric strength

Alumina Applications

Equipment lining
High voltage insulator
Artificial joints, dental implants
Igniter insulator
Valve seals, chemical pumps
High-temperature support structures
Laser optical components
Sealing rings in mechanical equipment
Electronic components & substrates
High-temperature electrical insulators
High voltage insulators
Laser tubes
Machine components
Mechanical seals
Precision shafts and axles in high wear environments
Roller and ball bearings
Seal rings
Semiconductor parts
Shot blast nozzles
Thermocouple tubes
Tap plates
Valve seats
Wear components

99.8%Alumina Material Properties

Mechanical Properties

Property	Unit	Alumina
Density	g/cm³	3.93
Vickers Hardness	GPa	18
Flexural Strength	MPa	416
Compressive Strength	MPa	2556
Water Absorption Rate	%	0
Alumina Content	%	99.8
Young’s Modulus	GPa	358

Thermal Performance

Property	Unit	Alumina
Thermal Conductivity	W/mK	30.8
Thermal Shock Resistance Strength	J/m²·K	2700
Maximum Operating Temperature	°C	1765

Electrical Characteristics

Property	Unit	Alumina
Permittivity (1 MHz)	–	9.28
Electric Strength	KV/mm	14.7
Volume Resistivity	Ω·cm	2.7×10¹⁴

Note: This value is for reference only and may vary slightly depending on the batch conditions.

Machining Alumina

Alumina is available in various purities, typically ranging from 90% to 99.9%, with Jundro Ceramics specializing in 99.8% purity material.
The material can be processed through several methods, including injection molding, die pressing, isostatic pressing, slip casting, and extrusionFurthermore, alumina can be effectively joined to metals or other ceramics using metalizing and brazing processes.

At Jundro Ceramics is Professional alumina ceramics manufacturer, we specialize in high-precision, complex machining Alumina parts. With our extensive in-house capabilities, including 4th and 5th axis machining centers, drilling, grinding, milling, polishing, sawing, tapping, threading, and turning, we ensure the highest quality alumina components that meet strict specifications.

5-Axis Alumina Ceramic Machining

Alumina Prototype Customization Case

We specialize in precision machining of Macor with complex shapes, and are able to achieve high-precision machining to meet the needs of various complex designs.

Frequently Asked Questions

What purity levels of alumina (Al₂O₃) ceramics can you provide?

Jundro Ceramics supplies multiple high-purity grades of alumina, including:
95%, 99%, 99.5%, 99.7%, and 99.8% Al₂O₃.
These grades cover applications from industrial structural parts to semiconductor, aerospace, and high-vacuum components.

Is there a significant difference between different alumina purities?

Yes. Higher purity alumina offers:

Higher hardness and strength
Better chemical resistance
Higher dielectric strength
Lower porosity and improved surface finish

95% alumina is suitable for general industrial parts, while 99%+ alumina is preferred for semiconductor, vacuum, and precision applications requiring superior insulation and mechanical stability.

Do you provide custom machining services for alumina ceramics?

Yes. Jundro Ceramics is a professional alumina ceramic manufacturer with extensive experience in precision machining.
We support custom-made alumina components used in semiconductor equipment, automation systems, aerospace parts, vacuum tools, and high-temperature applications.
Services include CNC milling, grinding, polishing, slotting, drilling, and complex geometries.

What is the difference between alumina and zirconia ceramics?

Alumina (Al₂O₃):
- Higher hardness
- Higher temperature resistance
- Better electrical insulation
- More cost-effective
- More brittle than zirconia
Zirconia (ZrO₂):
- Higher toughness and fracture resistance
- Better impact strength
- Lower thermal conductivity
- Suitable for wear parts requiring toughness

Alumina = harder & more temperature-stable; Zirconia = tougher & more impact-resistant.

What is the hardness of alumina ceramics?

Typical Vickers hardness (HV):
- 95% alumina: ~13.7 GPa
- 99% alumina: ~15.2 GPa
- 99.7% alumina: ~17.2 GPa
- 99.8% alumina: ~18 GPa
Higher purity correlates with higher hardness and better wear resistance.