How much physical pressure can high alumina bricks withstand?

It is well known that high alumina bricks are divided into three grades according to the content of aluminum Al2O3. The compressive strength of the first grade high alumina brick is 55MPa at room temperature, the compressive strength of the second grade high alumina brick is 50MPa, and the compressive strength of the third grade high alumina brick is 45MPa, 1MPa. It is equivalent to 10 kilograms.