Ceramic Thermocouple Protection Tubes Mullite and 998 Alumina for High Temperature Applications.
Our Protection Tubes are made to your specifications and needs.
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Industrial Process and Supply offers a varity of Ceramic Thermocouple Protection Tubes for many demanding process application. We offer Mullite and 998 Alumina as standard. Other ceramic/metal materials on request. Please consult factory.
| Material | Maximum Operating Temperature |
Thermal Shock Characteristics |
Typical Applications |
Remarks |
| Alumina (99.8%) |
3540ºF (1950ºC) |
Fair (preheating to 900ºF (482ºC) recommended |
Iron, Barium, crown glass: Non-ferrous metals; gas-tight protection for noble metal thermocouples in excess of 2400ºF (1316ºC) |
Sags at 2900ºF (1593ºC) Prevents dry hydrogen penetration |
| Porcelain (Mullite) |
2900ºF (1593ºC) |
Poor (preheating to 900ºF (482ºC) recommended |
Non-ferrous metals; gas-tight protection for noble metal thermocouples to 2400ºF (1316ºC) |
Sags at 2900ºF (1593ºC) Prone to attack by halogen gases; Some penetration of dry hydrogen. Contains silica |
Ceramic Protection Tubes are used in applications where contamination from hostile environments or the cutting action of concentrated and direct flame impingement are factors. Such conditions usually require a noble metal thermocouple such as platinum and platinum alloys.
When selecting assemblies using ceramic components, the expected maximum temperatures must be considered. At elevated temperatures, some ceramic materials go through a glass phase. As silica is a prime contaminant of platinum, alumina protecting tubes and insulators are recommended for temperatures exceeding 2000ºF (1093ºC).
Alumina & Mullite are easily machined with standard shop equipment.
High temperature ceramic cement maybe used to mount fittings and for repairs.
Related Products:
Type R and S Industrial Thermocouples
Metal Protection Tubes
Please visit Industrial Process and Sensor for more info.