针对GB/T 13021-1991规定的聚乙烯炭黑含量测试方法, 应用质量管理(QC)程序进行了试验条件的细化及调整, 确定了样品量0.5 g、热解600 ℃下恒温30 min、灼烧750 ℃下恒温10 min、气流量70 mL·min-1的最佳试验条件, 提高了工程用聚乙烯管材、管件及其原材料炭黑含量测试的准确度和重复性, 同时对此类测试标准的改进具有重要意义。

Determination for the carbon content of polyethylene was specified in the national standard method of GB/T 13021-1991. The above method involving experimental conditions was refined and revised using quality control program. The optimal experimental conditions were got as follows: sample mass was 0.5 g, thermal decomposition was kept at a constant temperature of 600 ℃ for 30 min, calcination was kept at a constant temperature of 750 ℃ for 10 min and the gas flow rate with 70 mL·min-1. The accuracy and repeatability of the test results were raised in the process of determination for carbon content of polyethylene pipes and fittings being used in engineering projects. In the same time the article has made an important significance for modifying the test standard method.