Alumina Ceramic Tube Insulator For Thermocouple

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Product Overview

Description



Product Description


Alumina Ceramic Thermocouple Insulator protection Porcelain Tube




Specification


Ceramic material performance index
 Alumina Ceramic
Zirconia Ceramic
Performance
 Unit
≧95
≧99
≧99.5
Bulk density
g /cm3
3.7
3.85
3.85
6
Hardness
HRA ≥
86
88
88
92
Flexure strength
Mpa≧
300
350
400
1100
The max.temperature
1500
1500
1500
1450
Linear expansion coefficient
×10-6/℃
7.5
8.2
8.2
10.2
Dielectric constant
εr20℃, 1MHz
9
9.2
9.2
28
Dielectric loss
tanδ×10-4, 1MHz
3
2
2
10
Volume resistivity
Ω·cm 20℃
10^13
10^14
10^14
10^14
Disruptive strength
KV/mm , DC≥
20
20
20
20
Acid resistance
mg/cm2 ≤
0.7
0.7
0.7
2
Alkali resistance
mg/cm2 ≤
0.2
0.1
0.1
0.08
Abrasive resistance
g/cm2 ≤
0.2
0.1
0.1
0.05
Compressive strength
MPa ≥
2500
2500
2500
3000
Rupture strength
MPa ≥
200
350
350
600
Elasticity modulus
GPa
300
350
350
210
Poisson ratio

0.2
0.22
0.22
0.23
Heat conductivity
W/m·K( 20℃)
20
25
25
2.6
















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