Everbuild kos fire cement everbuild pckosbkfire05 kos fire cement is a ready mixed blend of thermo setting resins and inorganic fillers that cures when exposed to heat resulting in a mortar which is resistant to temperatures up to 1250c can be used for domestic and commercial applications on fire bricks fire grates flue pipes flue bricks boilers and other applications subject to extreme heat offers excellent adhesion to fire bricks blockwork stone and clayware asbestos free everbu