Magnesium Oxide Powder is a white powdered mineral that provides a magnesium source. It is employed as an insulator in a variety of temperature sensors, including mineral insulated thermocouples. To offer electrical resistance as well as shielding to the temperature sensor wires, magnesium oxide powder is firmly packed. It has become the industry standard for temperature sensor powder insulation and can resist extremely high temperatures. Furthermore, magnesium oxide is a strong electrical insulator as well as a very effective thermal conductor.