Ceramacast 645N Used for High Temp Heaters


Ceramacast 645N, a new high temperature ceramic potting compound is now used to encapsulate and insulate high temperature, light-weight heaters for applications to 3000 °F (1650 °C).

 Aremco's Ceramacast 645N is a fused silica based ceramic compound ideal for encapsulating smallceramic and metal housings used in a variety of high temperature devices such as heaters, flow meters,and pressure and temperature sensors to 3000 oF (1650 °C).

Key attributes include excellent bonding toceramics and metals, ultra low thermal conductivity, high dielectric strength of 300 volts per mil, highcompressive strength of 7,000 psi, and exceptional chemical resistance.Ceramacasttm 645N is a simple to use compound. It is provided in a powder form and is mixed in a ratioof 100 parts powder to 18-20 parts water. The mixture sets at room temperature in less than 8 hours,then fully cures at 200 °F and 250 °F for 2-4 hours, respectively.

The shrinkage rate when fired to 1000°F is less than 0.3%.Ceramacast 645N is an environmentally friendly product that contains no asbestos or volatile organiccompounds. It can be applied easily by syringe, squeeze bottle or automatic dispensing equipment. It isavailable from stock in quart, gallon and 5 gallon containers.


  • Fused silica based ceramic compound
  • Excellent bonding toceramics and metals
  • Ultra low thermal conductivity
  • High dielectric strength of 300 volts per mil
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