Hot stove fire clay brick is made of refractory clay as the raw material. It is used in the hot stove, regenerator and partition walls. It is required to have good thermal shock resistance, high softening temperature and low creep rate.

China Metallurgical standard (YB / T 5107-1993) classifies the hot stove fire clay brick into RN-42、RN-40 and RN-36 3 according to the physical and chemical parameters.

There are the following provisions for the physical and chemical parameters and the allowable size deviation.

1) If the width is not more than 0.25mm, no limit to the length;

2) If the width is between 0.26-0.5mm, length should be no more than 30mm;

3) If the width is more than 0.5mm, not allowed.