1.1本规程涵盖了分离污染聚合物样品的未熔融颗粒、凝胶和杂质的方法。该程序可用于去除可能导致最终挤压产品缺陷的凝胶和不相容材料。在压力下，大多数凝胶会破裂或变形并通过丝网过滤器，但高分子量凝胶可能不会破裂或变形。 1.2如果需要，可随后通过光谱或其他分析手段识别在金属丝网过滤器上隔离的材料。 笔记 1-虽然不是作为定量方法提出的，但本实践中提出的程序可用于提供定量结果，由用户自行决定。用户负责验证定量结果的再现性。检测限取决于滤网的网目大小，但该程序通常适用于分离浓度大于0.1%的不混溶污染物。 1.3以国际单位制表示的数值应视为标准值。 1.4 本标准无意解决与其使用相关的安全问题（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。 有关具体的危害说明，请参阅第8节 . 笔记 2-没有已知的ISO等效于本规程。 ====意义和用途====== 材料的挤出和后续加工问题部分是由纸张、金属、凝胶、不相容聚合物或聚合物中发现的其他外来污染引起的。

1.1 This practice covers a means to separate the unmolten particles, gels, and impurities contaminating a polymer sample. The procedure may be used to remove gels and incompatible materials that may cause imperfections in the final extruded product. Under pressure, most gels will break up or deform and pass through a wire mesh filter, however high molecular weight gels may not break up or deform. 1.2 If desired, materials isolated on a wire mesh filter can subsequently be identified by spectroscopic or other analytical means. Note 1—Although not presented as a quantitative method, the procedure presented in this practice may be used to provide quantitative results at the discretion of the user. The user assumes the responsibility to verify the reproducibility of quantitative results. Detection limit depends on the mesh size of the filter screen, but the procedure is generally applicable to the separation of immiscible contaminants present at concentrations greater than 0.1 %. 1.3 The values stated in SI units are to be regarded as standard. 1.4 This standard does not purport to address 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. For specific hazards statements, see Section 8 . Note 2—There is no known ISO equivalent to this practice. ====== Significance And Use ====== Problems with extrusion and subsequent processing of the material are caused, in part, by the presence of paper, metal, gels, incompatible polymers, or other extraneous contamination found in polymers.