范围Z217。11.1本规程概述了测定聚苯乙烯产品在四氢呋喃（THF）中的二稀溶液粘度的方法。适用于未降解和光降解聚苯乙烯样品。用于测定相对粘度（粘度比）、特性粘度（对数粘度数）、特性粘度（极限粘度数）和粘均分子量。这些值将用于量化聚苯乙烯降解，作为分类系统的一部分。1. 2本标准并非旨在解决与其使用相关的所有安全问题。本标准的使用者有责任在使用前建立适当的安全和健康实践，并确定监管限制的适用性。Z217。21.1本方法通过测量实验室翻滚装置产生的磨损和冲击造成的质量损失来确定聚苯乙烯泡沫塑料的降解。1.2以公制（SI）单位表示的数值应视为标准。括号中的值仅供参考。 1.3本标准并非旨在解决与其使用相关的所有安全问题。本标准的使用者有责任在使用前建立适当的安全和健康实践，并确定监管限制的适用性。

ScopeZ217.11.1This practice outlines a method for the determination of the di lute solution viscosity of polystyrene products in tetrahydrofuran (THF). It is applicable to nondegraded and photodegraded polystyrene samples. It is used for the determination of relative viscosity (viscosity ratio), inherent viscosity (logarithmic viscosity number), intrinsic viscosity (limiting viscosity number), and viscosity average molecular weight. These values will be used to quantify polystyrene degradation as part of a classification system.1.2This Standard does not purport to address all of the safety problems 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.Z217.21.1This method determines the degradation of polystyrene foams by measuring mass loss due to a combination of abrasion and impact produced by a laboratory tumbling device.1.2The values stated in metric (SI) units are to be regarded as the standard. The values in parentheses are provided for information only.1.3This Standard does not purport to address all of the safety problems 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.