Alumina ceramic is kind of structural ceramics, with insulation resistance, voltage resistance, high strength, good thermal conductivity, dielectric loss, stable electrical performance characteristics. 

Material

Unit

Steatite ceramics

95% alumina ceramics

99.5% alumina ceramics

Density

G/cm3

2.7

3.65

3.85

Highest application temperature

°C

1100

1500

1800

Bending strength

Mpa

150

300

340

Compressive strength

Mpa

900

3400

3600

Hardness

HV0.5

800

1800

2000

Insulation breakdown strength

KV/mm

10

15

18

Processing technology

Process range (mm)

Outside Diameter

1—300

Inside Diameter

0.5—300

Length

0.5—1200

Accuracy of working (mm)

Perpendicularity

0.01

Concentricity

0.01

Roundness

0.005

Straightness 

0.005

Parallelism

0.01

Planeness

0.005

Roughness 

0.05

Fit clearance

0.005