Silicon nitride ceramic thermocouple protection tubes are used for melting aluminum to protect thermocouples. They are an advanced ceramic tube offering outstanding performance for temperature control in aluminium foundries and smelters and are extremely cost effective compared to competitive materials, such as cast iron, silicon carbide and alumina.

Silicon nitride has a unique combination of  excellent properties, such as high strength, toughness, excellent thermal shock resistance and resistance to corrosion, which make it the stand out material in this application.