依据GB/T 1633-2000, GB/T 8802-2001和中国合格评定国家认可委员会(CNAS)规定的程序进行实验室能力验证, 目的用于评价参与实验室的维卡软化温度的检测能力。采用SS＜0.3σ准则对制备试样进行均匀性、稳定性检验, 通过检验的试样的均匀性、稳定性均符合要求。采用Z比分数评价各参加实验室的测试结果, 以各参加实验室结果的中位值作为测试维卡软化温度的指定值, 以标准化四分位距作为变动性度量值(目标标准偏差)。参加的130个实验室中, 123个实验室的结果满意, 两个实验室的结果有问题, 5个实验室的结果不满意。通过该项目的研究, 制备了均匀性、稳定性符合要求的能力验证试样, 并采用适当的统计方法评估了参加实验室的维卡软化温度的检测能力。

According to the procedures prescribed by GB/T 1633-2000, GB/T 8802-2001 and CNAS (China National Accreditation Service for Conformity Assessment), the proficiency testing for laboratory was carried out to evaluate the measurement ability of laboratory for Vicat softening temperature. The uniformity and stability tests for samples had been done on the basis of the guidelines of SS<0.3σ, the results showed that the uniformity and stability of samples were in conformity with the requirements. The test results of laboratories were evaluated by the Z score, the median value of results tested by each laboratory had been as the specified value of Vicat softening temperature, and the standardized interquartile range (NIQR) had been as the volatility measurement value (target standard deviation). There were 130 laboratories in proficiency testing, the results of 123 laboratories were satisfied, that of two was wrong and five was dissatisfied. Through the study on the project, the proficiency testing samples met the requirements of uniformity and stability were prepared, and the testing abilities for Vicat softening temperature of laboratories were evaluated by the appropriate statistical methods.