Glenn

Gas forge refractories and where they go

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1)  The shell is the container that holds the blanket, etc that makes the forge. The propane tank will be the shell. Yes?

Next comes 2 layers of 1" 8lb. Ceramic wool refractory such as Inswool insulating blanket. Kaowool is another product but is becoming a term for the wool refractory. It's a high temperature insulating layer made from ceramic fibers.

Next the rigidizer both stiffens the ceramic wool refractory and contains the fibers so they don't break free and drift in your air. The stuff is a breathing hazard and can do permanent lung damage.  Ceramic Wool Insulation, Safety Alert

The hard refractory comes next and provide armor against both heat, flame and mechanical damage being poked and scraped by work going in and out. Kast-O-Lite 30 works well in around a 1/2" layer but some guys like 1/4" others more.

The last is a kiln wash painted on about like thick latex paint as a final bit of armor and IR re-reradiator. (meaning it gets really hot and radiates heat back into the forge).  IR reflective coatings are Plistix or Metrikote.

 

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