Property

Unit

99.7%Al2O3

95% Al2O3

Steatite

Density

g/cm3

3.9

3.5

2.7

Water Absorption

%

0

0

0

Sintering Temperature

°C

1700

1650

1350

Hardness

HV

17-23

12-15

4-5

Bending Strength

MPa

300

280

140

Compressive Strength

MPa

2100

1800

900

Max Working Temperature

°C

1,500

1,400

1,000

Co-efficient of Thermal Expansion 0-1000°C

/°C

7.9×10^-6

7.8×10^-6

6×10^-6

Thermal Shock Resistance

T(°C)

150

140

100

Thermal Conductivity

W/m.k (25°C,300°C)

25

21

2.5

Volume Resistivity 20°C

Ω.cm

>10¹²

>10¹²

>10¹²

Dielectric Strength

KV/mm

17

15

20

Dielectric Constant (100 Mhz)

(E)

9

9

6