AL2O3

99%

MgO

0.8%

Na2O

<0.15%

SiO2

<0.018%

Y2O3

<0.02%

Fe2O3

<0.02%

TiO2

<0.006%

CaO

<0.005%

Items

Test condition

Unit

Average grain size

µm

3 - 5

Density

g/cm³

≥3.85

Water absorption

%

0

Hardness (Vickers)

HV0.5

≥1900

Flexual strength

Distance between bending points 80mm

MPa

≥340

Compressing strength

MPa

3600

Linear thermal expanding coefficient

20-500°C

1x10⁶ mm/°C

6.5 – 7.5

20-800°C

6.5 - 8.0

Thermal conductivity

20°C

W/(m.K)

≥24

Dielectric strength

KV/mm

≥12

Volume resistivity

300°C

Ω.cm

≥10¹¹

Dielectric constant

1MHz

9.3-10.6

Dielectric loss

1MHz

3x10^-4

Thermal shock resistance

850°C

times

≥7