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Low Duty Firebrick (Floor)

Low-duty firebricks typically contain an alumina content ranging from 18% to 30%, making them suitable for applications with lower temperatures, such as residential fireplaces and low-temperature industrial settings. On the other hand, medium-duty firebricks generally have a higher alumina content, often ranging from 30% to 42%. These bricks are designed for use in applications with moderate temperatures, such as in industrial furnaces and kilns. It’s important to note that these are general alumina content ranges, and the actual composition may vary among different brands and manufacturers. High-duty firebricks, with alumina content of 43% and higher are typically used for higher temperature industrial applications.

One solution to the challenge of balancing the dome and floor temperature of a pizza ovens, and avoiding the problem of burning the bottom of your pizzas, is to use a Biscotto Stone rather than a firebrick for the pizza oven floor. The Biscotto stone has a lower heat transfer rate than any firebrick, low, medium or high-duty, making it easier to make pizza at high 850-950ºF temperature ranges.

A lower-cost solution to the problem is to purchase low-duty firebricks, which transfer heat faster than a Biscotto Stone, but slower than a medium-duty firebrick.

Whitacre Greer Fire Brick sells quality low-duty firebricks, and they dealers throughout the US, so you can avoid paying high shipping costs.