1.1本标准描述了用于选择WRM的标准以及用于确定实验室内和实验室间拟用于监测操作条件以建立暴露试验一致性的参考材料测量特性变化公差的程序。 注1:实验室加速试验的示例，其中可使用风化标准物质监测一致性，包括光照和水暴露试验，如实施规程G 152、G 153和G 154 G 155以及其他标准中所述，其中参考了根据这些标准进行的试验。可使用风化标准物质监测一致性的室外暴露示例是根据规程G 7、G 24或G 90进行的暴露。 标准物质也可用于监测不涉及光暴露的暴露或调节试验的一致性。 1.2本规程不包括（1）用于与试验材料进行稳定性比较的控制材料，或（2）用于定时暴露的标准材料。 1.3本规程概述了确定标准物质的测量特性如何随暴露于规定试验条件而变化所需的实验。它包括建立可再现的测量程序，确定引起变化的光源中的关键区域，以及其他关键暴露应力（如温度和湿度）的影响。 1.4本规程描述了使用风化标准物质进行循环试验的程序，以确定在不同实验室进行的暴露中标准物质特性变化的再现性，以及在单个设备中暴露复制标准物质样品并在一个实验室中测试时的重复性。 1.5本规程描述了使用循环试验结果的方差分析结果来确定暴露、测量装置、参考物质可变性和操作员误差对总可变性的贡献的程序。

1.1 This standard describes the criterion to be used for selection of a WRM and procedures to be used for determining within lab and between lab tolerances of changes in measured properties of a reference material intended for use in monitoring operating conditions to establish the consistency of exposure tests. Note 1—Examples of laboratory accelerated tests in which a weathering reference material could be used to monitor consistency are light and water exposure tests such as those described in Practices G 152, G 153, and G 154 G 155and other standards in which tests conducted according to these standards are referenced. Examples of outdoor exposures where a weathering reference material could be used to monitor consistency are those conducted according to Practices G 7, G 24, or G 90. A reference material can also be used to monitor consistency of exposure or conditioning test that do not involve exposure to light. 1.2 This practice does not cover (1) control materials used for comparison of stability with test materials, or (2) standard materials used to time exposures. 1.3 This practice provides an outline of experiments required to determine how the measured properties of the reference material change as a function of exposure to specified test conditions. It includes establishment of reproducible measurement procedures, determination of the critical region in the light source causing the changes, and effects of other critical exposure stresses such as temperature and moisture. 1.4 This practice describes procedures for conducting round-robin tests with the weathering reference material to determine reproducibility of the reference material property change in exposures conducted in different laboratories, and the repeatability when replicate reference material specimens are exposed in a single device and tested in one laboratory. 1.5 This practice describes procedures for using the results from analysis of variance on results from round-robin tests to determine the contribution of the exposure, the measurement device, reference material variability, and operator error to total variability.