1.1 本规程涵盖了聚氯乙烯化合物的相对熔融特性。 1.2 测试程序按以下顺序出现: 部分 熔合试验 9 热稳定性试验 10 保色稳定性试验 11 剪切稳定性试验 12 1.3 以国际单位制表示的数值应视为标准。 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。 具体危害说明见第节 8. . 注1: 没有涵盖本ASTM标准主要主题的ISO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PVC化合物在适当的加热和剪切条件下混合时，会产生熔融体。该质量具有一定的熔体特性，可以通过在固定剪切和温度条件下操作的扭矩流变仪来定义。PVC化合物的熔融特性表现为熔融时间、熔融扭矩、熔体扭矩、熔体粘度以及热稳定性和颜色稳定性。 5.2 对照批次将用作比较其他试验结果的标准。 测试数据将相对于对照批次进行评估。

1.1 This practice covers the relative fusion characteristics of poly(vinyl chloride) compounds. 1.2 The test procedures appear in the following order: Section Fusion Test 9 Thermal Stability Test 10 Color-Hold Stability Test 11 Shear Stability Test 12 1.3 The values stated in SI units are to be regarded as the standard. 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. Specific hazards statements are given in Section 8 . Note 1: There are no ISO standards covering the primary subject matter of this ASTM 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 When PVC compounds are mixed under appropriate conditions of heat and shear, a fused mass is produced. This mass has certain melt characteristics which can be defined with a torque rheometer operated under fixed conditions of shear and temperature. The fusion characteristics of a PVC compound are manifest as fusion time, fusion torque, melt torque, melt viscosity, and heat and color stability. 5.2 A control lot is to be used as a standard against which other test results are to be compared. Test data are to be evaluated relative to the control lot.