REFRACTORY MORTAR or FIRECLAYNEW by: Charles Cummins
Refractory mortar is used in furnaces and with fireplaces that use firebrick. You want to use firebrick for your firebox in your fireplace, and you will use fireclay or refractory (mortar) with the firebrick only. To learn more you will benefit yourself by going to brickcertification.com while there pay special attention to the GUARANTEE.
Thank you
Charlie Cummins