firebrick

These special purpose bricks are made to resist high temperatures, and are better thermal insulators than ordinary brick. They are used to line kilns, furnaces or fireplaces. Firebrick is set with a runny mix of clay and water, not with mortar.

Name Dimensions
9 inch straight 9 inches × 4½ inches × 2½ inch
9 inch (small) 9 inches × 3½ inches × 2½ inch
Split brick 9 inches × 4½ inches × 1¼ inch
2 inch brick 9 inches × 4½ inches × 2 inches
Soap 9 inches × 2¼ inches × 2½ inch
Checker 9 inches × 2¾ inches × 2¼ inch

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