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C799 thermocouple protection tubes

C799 protection tubes used for thermocouple are supplied with one end closed and one end open, usual length including 530,740,1030,1430,2030mm with different diameter 10×7,15×10,18×12,20×15,24×18mm etc.


Chemical composition and Physical Properties

PROPERTY

UNIT

ALUMINA CERAMIC

Type to DIN EN 60672-3

C530

C610

C795

C799

Al2O3 content

%

78

62

95

99.7

Specific gravity

g/cm3

2.5

2.7

3.68

3.82

Water absorption

%

8-12

0

0

0

Hardness

Mohs

6

8

9

9

Modulus of elasticity

Gpa

100

280

300

Flexural strength

N/mm2

30

120

280

300

Coefficient of linear expansion

20-100

20-300

20-600

20-1000

×10-6/

3.5-5

3.5-5

4-6

4-7

5-6

5-6

5-7

5-7

5-7

6-7.5

6-8

7-9

5-7

6-8

7-8

7-9

Specific heat (20-100)

J/kgK

800-900

850-1050

850-1050

850-1050

Thermal conductivity

W/mk

1.4-2

4-6

16-28

19-30

Maximum thermal stress

K

350

150

140

150

Dialectric strength

KV/mm

17

15

17

Max. Temp. Use

1500

1500

1550

1650

Chemical  resistivity

satisfactory

Good

Good

Good

Thermal shock resistance

Very good

Medium good

medium

Medium