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Chemical Composition and Physical Properties

Item

Test Condition

Unit&Symbol

95% Al2O3

99% Al2O3

99.7% Al2O3

The main chemical ingredient

 

 

Al2O3

Al2O3

Al2O3

Bulk Density

 

g/cm3

3.6

3.89

3.96

Maximum Use Temperature

 

 

1450°C

1600°C

1650°C

Water absorption

 

%

0

0

0

ROHS Hardness

 

 

≥85

≥89

≥89

Flexural strength

20° C

MPa (psi x 103)

358 (52)

550

550

Compressive Strength

20° C

MPa (psi x 103)

2068 (300)

2600(377)

2600(377)

Fracture Toughness

K(I c)

Mpa m1/2

4 - 5

5.6

6

Coefficient of thermal expansion

25-1000° C

1X 10-6/°C

7.6

7.9

8.2

Coefficient of thermal conductivity

20° C

W/m °K

16

30

30.4

Thermal Shock Resistance

Tc

°C

250

200

200

Dielectricity constant

1MHz.25°C

 

9

9.7

9.7

Dielectric strength

 

ac-kV/mm (ac V/mil)

8.3 (210)

8.7 (220)

8.7 (220)

Volume Resistivity

100°C

ohm-cm

> 1013

> 1014

> 1014