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High hardness, a certain degree of temperature tolerance, and it is a better material dynamic and static ring, brittleness, difficult in machining. Alumina ceramic main has 99.5-99.99% (referred to as 99%) and 95. Products are mainly used in mechanical seal ring, semiconductors, ball valve, etc.
Alumina is historically the most cost-effective and widely used engineering ceramic. It has a good combination of properties:


· Good hardness and wear resistance
· High strength and stiffness
· Good thermal stability
· Almost chemically inert


Alumina can be produced in purity ranges from 95% up to 99.5% (available in ivory color), for various applications.

Parameter

Unit

99.5% Al2O3

99% Al2O3

95% Al2O3

Density

g/cm3 

3.9

3.88

3.7

Hardness

Rockwell

HRA86

HRA85

HRA83

Flexural Strength

Mpa

400

380

350

Compression Strength

Mpa

2100

2000

1800

Elastic Modulus

Gpa

360

330

300

Thermal Conductivity

(W/m.K)

29

26

23

Thermal Expansion Coefficient

1x10-6/K

8.2

8.0

7.6

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