1.1 本规程涵盖了使用商用凝胶测试设备测定聚氨酯非泡沫配方的凝胶时间的程序。 1.2 描述了定义、术语和技术以及计算样本权重的过程。 1.3 以国际单位制表示的数值应视为标准值。 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1: 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 通用工具: 5.1.1 本规程适用于研究、质量控制、规范测试和过程控制。 5.1.2 定义和验证非泡沫聚氨酯配方的反应性是有用的。 5.2 限制: 5.2.1 操作员之间的可变性和实验室之间的可变性可能非常显著。 5.2.2 这种做法的可变性取决于用于测量凝胶时间的设备。建议测试实验室和客户就拟使用的设备和条件达成一致，包括以下内容: 5.2.2.1 凝胶测试仪和凝胶点标准， 5.2.2.2 混合器的速度/rpm， 5.2.2.3 混合刀片的类型和形状， 5.2.2.4 用于混合成分和测量凝胶时间的容器的尺寸和类型（例如，形状、衬里或无衬里），以及 5.2.2.5 放置在容器中用于测量凝胶时间的材料体积（或高度）以及凝胶测试仪的测量线或心轴从容器底部的深度。 5.2.3 本规程的用户应开发自己的精度数据，以确定这些程序是否满足其要求。 5. 2.4 使用这种做法可能无法检测到低水平（ppm，ppb）的污染物。

1.1 This practice covers procedures for determining the gel times of polyurethane non-foam formulations using commercially available gel test equipment. 1.2 Definitions, terms, and techniques are described along with procedures for calculating sample weights. 1.3 The values stated in SI units are to be regarded as 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. Note 1: 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 General Utility: 5.1.1 This practice is suitable for research, quality control, specification testing and process control. 5.1.2 It is useful to define and verify the reactivity of non-foam polyurethane formulations. 5.2 Limitations: 5.2.1 Operator-to-operator variability and lab-to-lab variability can be significant. 5.2.2 The variability of this practice is dependent on the equipment used to measure the gel time. It is recommended that the testing laboratory and the client agree on the equipment and the conditions to be used that include the following: 5.2.2.1 Gel Tester and gel point criteria, 5.2.2.2 Speed/rpm of the mixer, 5.2.2.3 Type and shape of the mix blades, 5.2.2.4 Size and type (for example, shape, lined or unlined) of container for mixing the components and for measuring the gel time, and 5.2.2.5 The volume (or height) of material to be placed in the container for measuring the gel time and the depth of the measuring wire or spindle of the gel tester from the bottom of the container. 5.2.3 Users of this practice shall develop their own precision data to determine if these procedures meet their requirements. 5.2.4 It is possible that low-levels (ppm, ppb) of contaminants will not be detected using this practice.