Ceramic Protection Tubes

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.