A refractory clay or mixture is slightly better but you do not need refractory temperature material for claying a forge.
Ceramic forge lining.
This video answers subscriber questions on the types of linings i considered to insulate my propane forge including hard concrete firebrick ceramic firebric.
Spray the ceramic fiber insulation down using water with a hand sprayer to wet it lightly.
To cure it you want to dry it slowly.
Clay suitable for making.
The liner becomes more of a heat sink much like dense firebrick and makes high temps needed for forging forge welding much more complicated if not impossible in some instances.
There are a few choices for the refractory lining i am using itc 100 ht which looks like a cement mortar however it can with stand extremely high heats.
We specialize in high temperature tools and refractory for forges kilns and heat treating applications.
First let the forge sit for a few hours minimum to air dry a little then fire up the forge just briefly and shut it down.
Can i cast my liner and skip using ceramic fiber blanket to line my forge.
Coal forge linings revisited by clay they mean clay of any type but preferably a clay with a placticity like good potters or artists clay.
These work up stiff and harden without cracking severly.
Next apply the satanite to the wool using a paintbrush covering all exposed wool surfaces.
Yes you can however a forge with a casted liner is usually very inefficient.
High temperature tools refractory is your source for refractory and other knifemaking supplies.