High temp cement for gluing fire bricks together.
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Rutland Products 25 lbs Castable Refractory Cement
RUTLAND Dry Mix 211 is a refractory mortar ideal for joining or repairing masonry flue tile in any gas or wood fireplace and wood, coal, or pellet stove chimney. Just add water, mix, and trowel on to seal and join flue tiles. It can also be used as a parge coating (thin overcoat) when building fireboxes to give your fireplace a nice, even, dark gray finish. Does not require (but is stronger with) heat curing. Meets NFPA 211 standards and NYSCMA Tek Spec 2.0.
Rutland 211 Dry Mix Refractory Mortar, 10 lbs