Actually, Ed...

I called the companies on this one and this is what I gathered from them...

Satanite is an old mortar refractory that does not reflect IR as well as ITC-100. Satanite is actually meant as a mortar for kiln bricks in large kilns. ITC is meant to increase kiln temps and atmospheric cleanliness. My salt tanks fired much higher after I coated the Inswool / Satanite with ITC-100.

At about $50.00 for a bag of Satanite it is also much cheaper than a pint of ITC-100 for $25.00 I find the Satanite performs quite well for basic forge operation and it helps keep flux out of the Inswool... for a while, anyway.

BTW Joss, if you are going to do any forge-welding you might consider going to Inswool with a castable refractory. I have been replacing the Inswool / Satanite lining in my D.Fogg Forge about every one or two months. A little bit of flux damage significantly lowers the forge temps. I plan on re-lining my old forge-welding unit with castable refractory, but keeping a new bigger forging / heat-treating forge with the Inswool / Satanite, since no flux goes in it...