This standard specifies the equipment, specimens, test procedures, calculation of rebound value, assessment of strength grade and test report for the rebound test to evaluate the strength grade of sintered ordinary bricks. This standard is applicable to those who do not have the test conditions specified in GB/T 2542. Evaluation of the strength grade of the inspection batch of lower-sintered ordinary bricks (hereinafter referred to as bricks); when the evaluation results are disputed, the strength grade arbitration inspection shall be carried out in accordance with the provisions of GB 5101 and GB/T 2542.