Answer:

Refractory bricks are made of stone powder and slime, which are fired in a 1300 Degree Celsius kiln and have a certain shape and size.

High temperature resistant upper limit, normal pressure above 1500 degrees Celsius;

Refractory soil, usually refers to a kind of soil used for folk stoves and furnaces.

The upper limit of high temperature resistance is about 1500 degrees Celsius.