DKJL CO., LTD.

ceramic protection tube

ceramic protection tube
Product Detailed

ceramic protection pipe has the charactiristic as following:
Purity:99.7%
Denstiy:3.90g/cm3
temp.:1800 degree

Item

Unit

High corundum

Corundum

High Purity Alumina 

Chemical Composition

Al2O3

%

99.7

99.3

85

SiO2

%

0.1

 

 

Density

g/cm3

3.95

3.88

3.2

Water absorption

%

0

0.01

0.2

Compressive Strength

Mpa

450

350

200

20Gas tightness

Torr/L.sec

10-11

10-11

10-11

High-temp.bending

mm

1700 0.2

1600 0.2

1400 0.2

High-temp. bonding

 

1700 not

1600 not

1400 not

20-1000         Expansion coefficient

mm.10-6/.m

8.6

8.2

8.2

Thermal conductivity

W/m.k

25

25

25

Breakdown voltage

KV/mm

20

20

15

High-temp. resistance

1000 MΩ

≥0.08

≥0.08

≥0.08

1300 MΩ

≥0.02

≥0.02

≥0.02

20 DC resistance

Ohm/cm

1014

1014

1014

Chill and abrupt heat

 

1550not cracking six times

1550not cracking six times

1300 not cracking thrice

Max. Service Temp.

 

1900

1800

1400

 

Material: Corundum

Use: For thermocouple, interval and insulation between couple wires. For specifications, there are single hole, double holes, four holes and multi-holes. For form, there are round and oval pipes.

Features: Great mechanical strength, good resistance to thermal impact, good insulation and high-frequency characteristics under high temperature. Breakdowm voltage and volume resistance and self-reactance are great and thermal expansion coefficient is small.



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