A dry mix used to mortar and repair clay flue tiles and repair or replace firebrick in firebox. Used for fireplaces, wood, coal or pellet stoves, inserts, etc. Non water soluble, resists washing out when exposed to rain or water. Dark gray color.
Develops a compressive strength above 2500 psi and withstands 2550 degrees Fahrenheit without softening. Meets or exceeds all the requirements of the National Fire Protection Association NFPA 211 and NYSCMA Tek Spec.