致密度测试是基于阿基米德排水法原理，采用杭州金迈仪器有限公司生产的 DE-120M 型高精度密度计进行测试。为了减少测试误差，每个测试样品测试前 均进行了外表面打磨去除氧化皮和烘干水分的操作。

The density test is based on the principle of Archimedes drainage method, using the DE-120M high-precision density meter produced by Hangzhou Jinmai Instrument Co., Ltd. for testing. In order to reduce the test error, the outer surface of each test sample was polished to remove the oxide scale and dried before the test.