1.1本试验方法涵盖了用于评估单晶陶瓷晶须（SCCW）气载浓度和尺寸分布的采样方法和分析技术，如碳化硅和氮化硅，这些材料可能出现在制造、加工、运输或使用这些材料的工作场所内和周围。本试验方法基于通过过滤器过滤已知量的空气。随后使用透射电子显微镜（TEM）评估过滤器的纤维数量，以满足适当选择的形态和成分标准。该测试方法能够根据能量色散X射线光谱（EDS）分析和选区电子衍射（SAED）分析区分不同类型的纤维。本试验方法可能适用于其他人- 人造矿物纤维（MMMF）。 1.2本试验方法适用于收集过滤器上大于0.5的纤维的定量 μ 长度m，小于3 μ 宽度为m，纵横比等于或大于5:1 (1) . 这些数据可以直接转换为每单位体积采样空气的浓度声明。该测试方法受重合干扰粒子数量的限制。 1.3以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.4 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。 ====意义和用途====== SCCW可能存在于制造、加工、运输或使用这些材料的工作场所大气中。该测试方法可用于监测这些环境中空气中纤维的浓度。它可以作为个人或区域监控策略的一部分。 该测试方法基于形态、元素组成和晶体结构。该分析技术具有积极识别SCCW的能力。 笔记 1-本试验方法假设分析员熟悉TEM/EDS仪器的操作以及使用这些技术获得的数据的解释。 本试验方法适用于测量SCCW光纤的总数量，包括直径为 ≤ 0.1 μ m。 应报告使用本试验方法的结果以及所研究样品的95%置信限。 单个实验室应确定其实验室内变异系数，并将其用于报告95%置信限 (2,5,6) .

1.1 This test method covers the sampling methods and analysis techniques used to assess the airborne concentration and size distribution of single-crystal ceramic whiskers (SCCW), such as silicon carbide and silicon nitride, which may occur in and around the workplace where these materials are manufactured, processed, transported, or used. This test method is based on the filtration of a known quantity of air through a filter. The filter is subsequently evaluated with a transmission electron microscope (TEM) for the number of fibers meeting appropriately selected morphological and compositional criteria. This test method has the ability to distinguish among different types of fibers based on energy dispersive X-ray spectroscopy (EDS) analysis and selected area electron diffraction (SAED) analysis. This test method may be appropriate for other man-made mineral fibers (MMMF). 1.2 This test method is applicable to the quantitation of fibers on a collection filter that are greater than 0.5 μ m in length, less than 3 μ m in width, and have an aspect ratio equal to or greater than 5:1 (1) . The data are directly convertible to a statement of concentration per unit volume of air sampled. This test method is limited by the amount of coincident interference particles. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.4 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. ====== Significance And Use ====== The SCCW may be present in the workplace atmosphere where these materials are manufactured, processed, transported, or used. This test method can be used to monitor airborne concentrations of fibers in these environments. It may be employed as part of a personal or area monitoring strategy. This test method is based on morphology, elemental composition, and crystal structure. The analysis technique has the ability to positively identify SCCW. Note 1—This test method assumes that the analyst is familiar with the operation of TEM/EDS instrumentation and the interpretation of data obtained using these techniques. This test method is applicable for the measurement of the total population of SCCW fibers including fibers with diameters ≤ 0.1 μ m. Results from the use of this test method shall be reported along with 95 % confidence limits for the samples being studied. Individual laboratories shall determine their intralaboratory coefficient of variation and use it for reporting 95 % confidence limits (2,5,6) .