1.1当实验室无法在相关试验方法精度声明中给出的范围内对其仪器进行物理校准以获得ASTM参考黑的标准值时，本规程提供了一种统计程序，用于提高试验再现性。 1.2 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。

1.1 This practice provides a statistical procedure for improving test reproducibility when a laboratory cannot physically calibrate its apparatus to obtain the standard values of the ASTM reference blacks, within the ranges given in the precision statement of the test method concerned. 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.