Datasheet of Alumina

Main Characteristics

Good Metallization & Wear Resistance

Main Applications

IC Packing, Electronic Parts, Mechanical Parts.

Characteristics

Item

96% Alumina

99% Alumina

99.7% Alumina

Unit

Mechanical Characteristics

Colour

White

Ivory

White/Ivory

Density

3.65

3.8

3.91

g/cm3

Bending Strength

300

310

370

MPa

Compressive Strength

2100

2200

2500

MPa

Elastic Modulus

320

340

390

GPa

Fracture Toughness

3~4

3~4

4~5

MPam1/2

Vickers Hardness

1400

1600

1800

HV0.5

Thermal Characteristics

Coefficient of Line Thermal Expansion

8

8.2

8.2

10-6K-1

Thermal Conductivity

22

25

30

W/mK

Thermal Shock Resistance

(Put in Water)

250

200

280

∆T°C

Max Working Temperature

1500

1600

1700

°C

Electrical Characteristics

Volume Resistance at 20°C

>1014

>1014

>1014

Ωcm

Dielectric Strength

15×106

15×106

15×106

V/m

Dielectric Constant

9

9

10

εr

One MHZ Dielectric 

Loss Angle at 20°C

0.0004

0.0002

0.0001

tanδ