5 lbs tub of ready mixed  High temp 3000°F mortar.
It’s used for cementing refractory bricks or top coating kaowool .

Air curing and offering protection from incidental abrasion and breakage of kaowool fibres when used as a top coat. 
use uni-cast or uni-ram for extreme duty such as forge floors.

Alumina-silica, super duty, air setting mortar