Ceramic Thermocouple Protection Tube

High Alumina Ceramic Thermocouple Tube

Material: Al₂O₃
Max. Working temperature : 1800℃
Diameter: from 1-120mm, 
Length: from 5-3000mm
Al₂O₃ content determines the measuring temperature level, Al₂O₃ content higher, the 
temperature is higher.

Parameter
Properties Ceramic Type
85% Al₂O₃ 95% Al₂O₃ 99.5 Al₂O₃
Color White Pink Ivory
Max. Temperature 1500℃ 1650℃ 1800℃
Working Temperature 1350℃ 1450℃ 1600℃
Water Absorption <0.2% <0.1% <0.1%
Hardness(Mohs scale) 7 9 9
Volume Resistivity(20℃) 10 ¹³Ω·m 10 ¹³Ω·m 10 ¹³Ω·m
Volume Resistivity(1000℃) 10⁶ohm.cm 10⁶ohm.cm 10⁶ohm.cm
Density 3.2g/cm³ 3.8g/cm³ 3.9g/cm³
Flexural Strength >150Mpa >250Mpa >250Mpa

Features and advantage

1.Great mechanical strength
2.Low thermal conductivity
3.High heat resistance
4.High softening temperature
5.Small thermal expansion coefficient 
6.Good cold-resistance heat-resistance
7.Resistance to acid and alkali corrosion
8.Long service life