Brick 2300`F Soft 9" X 4.5" X 2.5" is used for constructing kilns, this is the most common insulating brick used in kiln building. It is very soft and easily cut with hand tools. Can be used as a soldering block. You will need 25 to make a base for a raku kiln.
WARNING: This product can expose you to chemicals including Silica, crystalline (airborne particles of respirable size), which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.