Ceramic Pipes

Ceramic pipe Features and advantage 
Great mechanical strength
Low thermal conductivity
High heat resistance 
High softening temperature
Small thermal expansion coefficient 
Good cold-resistance heat-resistance
Resistance to acid and alkali corrosion
Long service life 
 
Ceramic pipe Technical Index
 
AL2O3% Composition Density
(g/cm3)
Flexural Strength
(MPa)
Thermal Conductivity 
[w/(m.R)]
Dielectric Strength 
(KV/mm)
Working Temp.
60 3.0 205 16 10 1000°C
75 3.1 280 17 10 1250°C
80 3.3 215.7 17 10 1290°C
85 3.4 230 17 10 1350°C
92 3.6 312 18 10 1390°C
95 3.7 304 20 10 1480°C
99 3.81 340 34 10 1600°C
99.7 3.85 370 35 10 1700°C
 
There are 3 categories accorind to Alumina content and features: Common ceramic pipe, Al2O3<75%; High Alumina ceramic pipe, Al2O3 75%-90%; Corundum pipe:Al2O3>90%. 
After comparison,their features are as below:
 
Ceramic pipe Technical Index compairson 
Al2O3 content
%
70-75 85 95 99.7
Density
(g/cm3)
3.0 3.4 3.7 3.9
Bending Strength
(Mpa)
85N/MM2 300 364 450
    Expansion
(X10-6/°C)(25-800°C)
6 7 7.6 8
Thermal Conductivity
(W/(m.R))
17 18 20 35
Dielectric Strength
(kv/mm)
9 10 11 12
Working Temperature
°C (Long time use)
1300 1400 1600 1750
Water Absorption
%
5 <0.2 <0.2 <0.1-0.2
 
 
In order to decrease cost, Al2O3 roller also can be used as ceramic pipe after cutting under certain condition , they are low cost and has accurate size. 
 
Ceramic pipe  physical and chemical properties
Characteristics Items Types
VS-2000 S-2000 S-4000 S-6000
Physical
properties
Bulk density(g/cm3) ≥2.4 ≥2.4 ≥2.6 ≥2.8
Apparent porosity(%) 20-23 20-25 15-20 10-15
Water absorption(%) 8-10 8-12 7-10 4-7
Bending strength
(25ºC/1350ºC,Mpa)
>55/35 >50/30 >60/50 >70/60
Thermal expansion coefficient
(*10(-6)/ ºC)(25~1000ºC)
5.8-6.0 5.8-6.2 5.8-6.2 5.8-6.0
Thermal shock resistance(1300~25ºC) Good Very good Very good Good
Working Temp(ºC) ≤1200 ≤1230 ≤1300 ≤1350
Composition Al2O3(5) 74-76 74-76 72-74 78-80
SiO2(%) 20-22 20-22 19-21 14-16
Fe2O3(%) ≤0.3 ≤0.3 ≤0.3 ≤0.2
Reference
loading
Φ50*3800mm 5.0
(1200ºC)
4.5
(1230ºC)
6.0
(1300ºC)
7.5
(1350ºC)