Mineral insulation thermocouples, commonly referred to as MgO (magnesium oxide) thermocouples, are used in many laboratory processes and applications. They are available in J, K, T, E, N thermocouples and a wide range of different sheath diameters and materials. Their nature is flexible and bendable, and their relatively high temperatures make MI thermocouples suitable for many measurement applications. Temperature makes it a popular option.

In general, two types of cables are used in production, the first is the cable with its cover and insulation of internal wires made of Teflon or PTFE whose temperature tolerance is up to 270 degrees Celsius and the second category of cables with general coating and insulation of the brain It is made of fiberglass (glass wool family) and a shield made of 316 stainless steel is woven on all fiberglass, which makes the cable durable during stretching. It is worth mentioning that the temperature tolerance of this cable is 350 degrees.