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Alumina Ceramic Insulator Tubes


Alumina Ceramic Insulator Tubes



Alumina ceramic insulator tubes are used in manufacturing thermocouples for temperature measurement and conrol.

Insulator tubes for mounting thermocouple wires can be produced with one to ten bores. They are available either in round or oval forms with an option on inserted slots.




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



Alumina Ceramic Insulator Tubes Sizes


                                            ALUMINA CERAMIC DOUBLE BORE INSULATOR TUBE

OD×ID

mm

Length

(mm)

OD×ID

mm

Length

(mm)

OD×ID

mm

Length

(mm)

1×0.3

1.2×0.3

1.4×0.4

1.5×0.4

2×0.3

2×0.5

2×0.6

2.5×0.7

1500

3×0.7

3.5×0.8

3.5×1

4×1.2

4×1.5

4.5×1.2

5×1.2

5×1.5




2500

5.5×1.8

6×1.8

6.5×1.8

6.5×2

8×2

8×2.4

10×2.7

16×4.9




2500

2500


                                                      ALUMINA CERAMIC FOUR BORE INSULATOR TUBE

OD×ID

mm

Length

(mm)

OD×ID

mm

Length

(mm)

OD×ID

mm

Length

(mm)

1.5×0.3

2×0.4

2.5×0.6

3×0.8

3.5×0.8

3.5×1

4×1

2500

4×1.3

4.5×1.2

5×1.2

5.5×1.3

6×1.3

6.5×1.4

8×2




2500

10×3

12×3.9

14×3.9

16×4




2500