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Alumina (Al2O3) Ceramics

Alumina, or aluminum oxide Al2O3, with a molecular weight of 102, is the major source of aluminium in nature. Normal Al2O3 products have a very high melting point, which is 2,072℃. Alumina ceramic is the most common technical ceramic material and relatively traditional material. High-purity aluminum oxide ceramics as a fine ceramic material is widely used in a lot of industries.

Read more: Everything You Need to Know about Alumina Ceramics

Alumina Properties:

  • Superb performances in electrical insulation
  • High thermal conductivity
  • High chemical resistance
  • Good wear resistance
  • Low thermal expansion



Alumina Ceramics Specifications

Material Alumina
Properties Units AL997 AL995 AL99 AL95
%Alumina - 99.70% 99.50% 99.00% 95.00%
Color - Ivory Ivory Ivory Ivory & White
Permeability - Gas-tight Gas-tight Gas-tight Gas-tight
Density g/cm3 3.94 3.9 3.8 3.75
Straightness - 1‰ 1‰ 1‰ 1‰
Hardness Mohs Scale 9 9 9 8.8
Water Absorption - ≤0.2 ≤0.2 ≤0.2 ≤0.2
Flexural Strength(Typical 20℃) Mpa 375 370 340 304
Compressive Strength
(Typical 20℃)
Mpa 2300 2300 2210 1910
Coefficient of Thermal Expansion
(25℃ to 800℃)
0-6/℃ 7.6 7.6 7.6 7.6
Dielectric Strength (5mm Thickness) AC-kv/mm 10 10 10 10
Dielectric Loss
25ºC@ 1MHz
- < 0.0001 < 0.0001 0.0006 0.0004
Dielectric Constant 25º C@ 1MHz 9.8 9.7 9.5 9.2
Volume Resistivity (20℃)
Ω·cm³ >1014
Long-term Operating Temperature 1700 1650 1600 1400
Thermal Conductivity (25℃) W/m·K 35 35 34 20

Alumina Ceramics Applications

ACM offers Alumina Ceramics satisfying a wide range of customer requirements and applications. Various alumina grades and alumina purities in both porous and non-porous varieties are available. The main Applications of Alumina Ceramics are as follows:

Alumina tubes are used for industrial furnaces and thermal couple protectors. High-purity alumina materials are excellent for making parts for CVD, ion implants, photolithography, and semiconductor parts.

In traditional industries, alumina ceramics are ideal for products such as injector tubes, gas nozzles, and insulators.

Compared with metals, alumina ceramic material is extremely hard, making it an ideal material for abrasive, grinding media.

Alumina mortars and pestles are widely used in laboratories for grinding hard materials.

Alumina Ceramics have excellent biocompatibility, high strength, and high wear resistance. So, they are also ideal materials for the preparation of artificial bones and artificial joints.

Alumina Powder Formulations

ACM's product formulations are developed to address the varied application problems in which ceramic components are commonly used. Many industrial applications push the envelope on specific requirements leading to the development of new formulations to successfully address them.

Properties Unit Fused Alumina Reactive Grade Alumina Ready To Press Alumina (RTP Alumina) Activated Alumina
Al2OContent % 95.5 99.8 98 96 94 92 90
Bulk Density g/cm3 3.95 ~600 ~1000 ~600 ~1100 ~900 ~1200 ~1100
Grain Size μm Customized Customized ≈130 ≈170 ≈100 ≈200 customized
Color White White White White
Melting Point 2000
Hardness Mohs 9
Specific Surface Area m2/g 0.2-0.5 3.5-5 2-3 6-9 6-10 200-260

ACM Ceramic Product Categories

Your Alumina Ceramics Supplier

Advanced Ceramic Materials (ACM) is a leading supplier of alumina ceramic products of the highest quality for a wide range of applications. We are happy to provide advice on materials, design, and application. Feel free to contact us with any questions about Al2O3 or other ceramic materials that are not listed on the website. 


Q:how Are Alumina Ceramic Components Made?
A: Alumina ceramics are typically manufactured from bauxite and can be shaped using injection molding, die pressing, isostatic pressing, slip casting, diamond machining, and extrusion. Like aluminum nitride and other important engineering materials, alumina can be produced by dry press and sinter or by hot pressing using appropriate sintering aids.
Q: Do You Supply Customized Al2O3 Ceramic Components?
A: We can supply customized products according to the drawings you provide, and our engineers can also provide technical support and advice for your design.
Q: What Are the Characteristics of Alumina Ceramics?
A: Alumina ceramics are characterized by high hardness, excellent resistance to corrosion, thermal stability, good dielectric properties (for converting from DC to GHz frequencies), low loss tangent, and stiffness. See the next section for more details on the properties of alumina ceramic materials.
Q: What Are the Different Types of Aluminum Oxide Ceramic?
A: Depending on the content of Al2O3 and additives used, there are different series of aluminum oxide mateials. Based on the Al2O3 content, alumina can be categorized as 75% alumina, 85% alumina, 95% alumina, 99% alumina, and so on. Based on the difference in crystal phase, there are mullite, corundum-mullite, and corundum; Based on the variety of additives used, there is the chromium corundum, titanium corundum, etc.
Q: What Are the Differences Between Zirconia Toughened Alumina (zta) and Alumina Toughened Zirconia (atz)?
A: While both ZTA and ATZ have the same raw materials, it is important not to confuse the two composites. In alumina toughened zirconia (ATZ), the ratio of alumina to zirconia is low. In zirconia toughened alumina (ZTA), the opposite is the case.
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