Refractory mortar differs from regular mortar in that it is designed to resist high temperatures. It is the desired product to use when constructing a firebox inside fireplaces, fire pits, boilers, kilns or bake ovens.
Not to be confused with traditional fireclay mortar, major building codes now require refractory mortar for these types of installations, so when installing or repairing a firebox, it is best that you use a product that meets the code requirements and is easy to use.
How is refractory mortar different? Refractory mortar is made from high temperature binders and carefully selected aggregates that will not break down under high temperatures.
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Source: chimneys.com/refractory-mortar/