The requirements of the national standard GB2988-87 for the allowable deviation of the high alumina brick size are as follows:
Size ≤10mm, ±2mm;
Size 101—300mm, ±2mm;
The size is 301-400mm, ±6mm.
The requirements for the distortion deviation of high alumina bricks are as follows:
Length≤300mm, ±2mm;
Length 301-400mm, 2.5mm;
Length> 400mm, agreement.
The required size deviation of the missing corner depth of high alumina brick is as follows:
Not more than 6mm, the depth of missing edge is not more than 6mm, and the diameter of molten hole is not more than 6mm.
The crack deviation requirements of high alumina bricks are as follows:
The width is ≤0.25mm, and the length is not limited (but it is not allowed to form a net);
Width 0.26-0.5mm, length 50mm:
Width 0.51-1.0mm, length 20mm;
Those with a width greater than 1.0mm are not allowed.
