China Al2O3 99% Alumina Insulated Tube for Temperature Measuring Element

Alumina insulated tube
Alumina insulated tube is made of materials with good insulation, the main function is to separate the different pole items of the temperature measuring element, to avoid interference of the two poles or contact short circuit. When in use, the two poles of the temperature measuring element can be inserted into different holes in the same direction. After installation, protect with protective tube set.
Due to different use temperatures, it is subdivided into 99.7 porcelain (corundum), 99 porcelain (corundum), 95 porcelain (corundum), 85 porcelain (high-aluminum porcelain), 75 porcelain (mullite porcelain), and chemical porcelain with different alumina content. 40 aluminum), the higher the aluminum oxide content in the above materials, the higher the use temperature, the highest aluminum content vertical use 1710 degrees Celsius, the lowest aluminum content uses 1100 degrees Celsius.
Normal size: The conventional size of the insulating tube is 1mm to 8mm in outer diameter, the hole is divided into single hole, double hole, four hole and porous, the minimum hole diameter is 0.5mm, the longest length is 2500mm, other sizes can also be made according to user requirements
Physical Property:

Material Alumina ContentCharacteristicUnitAL99.7AL99.5AL99AL95Content 99.7%99.5%99%95%Color Ivory whiteIvory whiteIvory whiteIvory white,
Densityg/cm3.943.93.83.75Straightness 2‰2‰2‰2‰HardnessMohs hardness9998.8Water absorption <=0.2<=0.2<=0.2<=0.2Flexural strength(20ºC) Mpa375370340304Compressive strength(20ºC) Mpa2300230022101910Thermal expansion coefficient10/ºC7.67.67.67.6Dielectric strengthAC.kv/mn10101010Dielectric loss<0.0001<0.00010.00060.00040.001Volume resistivity
(20ºC)
(300ºC)
Ω.cm3
>1014
2*1012
>1014
2*1012
>1014
4*1011
>1014
2*1011Dielectric constant25ºC@1HM9.89.79.59.2Thermal conductivityW/m.k35353420Long-term use temperatureºC1700165016001400

Packaging methods : carton packaging, export wooden box packaging, paper tube packaging, hanger packaging