1.1 本规程通过评定由于在180°环形弯管内设置的压缩应力而喷出的增塑剂量，确定增塑剂在聚氯乙烯塑料中的兼容性。 注1: 除增塑剂外的其他成分可以从总配方中喷出。 1.2 本惯例的文本参考了提供解释材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应视为本惯例的要求。 1.3 以国际单位制表示的数值应视为标准。括号中的值仅供参考。 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、健康和环境实践，并确定监管限制的适用性。 注2: 没有已知的ISO等效于本标准。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 当熔融化合物受到压缩应力时，增塑剂在聚氯乙烯树脂中的相容性可能会降低。 5.1.1 该试验使标准试样受到一定的变形，并允许定性测定一段时间内可能发生的喷溅量。 5.1.2 增塑剂与后续渗出物的相容性明显降低可能会导致污垢过多、漆面或清漆表面受损、手感粘稠以及许多其他相关问题。 5.1.3 当通过将塑化聚氯乙烯板材弯曲180°在压缩过程中对其施加应力时，释放应力的一种方法是将塑化剂从压缩区域（弯曲内部）迁移到拉伸区域（弯曲外部）。 如果这些压应力不能通过增塑剂的内部迁移迅速缓解，则增塑剂将喷出。增塑剂的内部迁移将继续，当压缩区域出现增塑剂不足时，喷出的增塑剂将被重新吸收。某些增塑剂可能会快速喷出并被重新吸收。相容性较差的增塑剂能够早期喷出，并在整个试验过程中继续喷出。一周的测试用于筛查，而七周的延长测试用于完整的档案。 注3: 允许卖方和买方就时间、温度或相对湿度的其他测试条件达成一致。

1.1 This practice determines the compatibility of plasticizers in poly(vinyl chloride) plastics by rating the amount of plasticizer that spews due to compressional stress set up inside a 180° loop bend. Note 1: Ingredients other than plasticizer can spew from a total formulation. 1.2 The text of this practice references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of this practice. 1.3 The values as stated in SI units are to be regarded as the standard. The values in parentheses are given 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Note 2: There is no known ISO equivalent to this standard. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 It is possible for plasticizers to become less compatible in poly(vinyl chloride) resin when fused compound is subjected to compressive stress. 5.1.1 This test subjects a standard test specimen to a definite deformation and allows qualitative determination of the amount of spew that is capable of occurring over a period of time. 5.1.2 An apparent decrease in compatibility of plasticizers with subsequent exudation can cause excessive dirt pickup, marring of lacquered or varnished surfaces, sticky feel, and a number of other associated problems. 5.1.3 When a plasticized poly(vinyl chloride) sheet is stressed in compression by bending it through 180°, one way to relieve the stress is by migration of the plasticizer from the compressed area (inside of bend) to the area in tension (outside of bend). If these compressive stresses cannot be relieved rapidly by internal migration of plasticizer, then plasticizer will spew. The internal migration of plasticizer will continue and when a deficiency of plasticizer occurs at the compressed area spewed plasticizer will be reabsorbed. It is possible for certain plasticizers to spew and be reabsorbed quite rapidly. Less compatible plasticizers are capable of spewing early and continuing to spew throughout the test. A test of one week's duration is used for screening, while an extended test of seven weeks' duration is used for a complete profile. Note 3: It is permissible for the seller and the purchaser to agree upon other test conditions of time, temperature, or relative humidity.