The high carbon cast iron thermocouple protection sheath can be supplied with an enamel coating which reduces heat and melt loss, the coating helps to prevent contamination during the melt. It is commonly used for melting aluminium by the aluminium processing industry, within the furnace combustion chamber, chute, ladle and other casting areas.

Made of iron and carbon (with other corrosion-resistant metal elements), the Cast Iron surface can be supplied with a protective high-temperature enamel coating. With the enamel coating the heat and melting loss in the melt are small, it therefore does not pollute the melt.

The Red coating is a better quality and can withstand a higher temperature, 850°C. The black coating is a lower cost, more economical, coating which will withstand 800°C. Sheaths without the enamel coating can withstand 1150°C.

The material has high strength properties which can offer a longer working lifespan compared with other ceramic style sheaths (silicon carbide, silicon nitride, etc.). The construction offers a robust and cost-effective solution. Available with internal thread of ¾" BSPP or ¾" NPT (other threads available on request).


  • Supplied with Enamel coating or standard rough cast iron pipe
  • Preheating is not required
  • anti-corrosion zirconia protective coating
  • Available, length up to 2745mm
  • Red Enamel Coating Suitable for long-term use at 850°C
  • Black Enamel Coating Suitable for long-term use at 800°C
  • Without Coating Suitable for long-term use at 1150°C


Standard sizes

  Outside Diameter (mm) Inside Diameter (mm) Available Lengths
Red Enamel Coating 40 12 12" (305mm) to 108" (2745mm)
Red Enamel Coating 43 22
Black Enamel Coating 43 22
No Coating 40 12
No Coating 43 22