Hot sale 99 alumina ceramic tube

Serial number

performance index

Measuring unit

High purity alumina

Alumina

High alumina

1

Al2O3

%

99.7

99.3

85

2

SiO2

%

less than0.1

—

—

3

Density

g/cm3

3.95

3.88

3.2

4

Water absorption

%

0

0.01

0.2

5

Cld compressive strength

MPa

450

350

200

6

20 °C leak rates

Torr/L.sec

less than10-11

less than10-11

less than10-11

7

Twisting in high temperature

mm

    1700 °C

 0.2 allowance

     1600 °C

0.2 allowance

    1400 °C

0.2 allowance

9

20—1000°C coefficient of thermal expansion

mm.10-6/degree Celsius.m

8.6

8.2

8.2

10

Thermal conductivity

W/m.k

25

25

25

11

Electric insulation strength

KV/mm

20

20

15

12

20 °C

 direct current

insulating resistance

Ohm/cm

1014

1014

1014

13

High-temperature

insulation resistance

1000 °C

 MΩ

≥0.08

≥0.08

≥0.08

14

Thermal shock resistance

1300°C

  MΩ

≥0.02

≥0.02

≥0.02

1550°C 6 times not cracked

1550°C 6 times not cracked

1300°C  3 times not cracked

15

Maximum service temperature

degree Celsius

1900

1800