Key specifications are outlined below :

Insulation: The primary function of MgO powder in thermocouples is to provide electrical insulation between the thermocouple wires and the metal sheath that encloses them. This prevents short circuits and ensures accurate temperature readings.
Physical Support: The MgO powder acts as a filler material, providing structural support to the thermocouple wires within the metal sheath. This helps to protect the wires from mechanical damage and vibration.
Corrosion Resistance: MgO powder is highly resistant to corrosion, which is important for thermocouples used in harsh environments.