1.1 本试验方法包括测定碳纤维环氧胶带和薄板的凝胶时间。本试验方法适用于测量高粘度或低粘度树脂系统的凝胶时间。 1.2 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 1.2.1 在文本中，英寸-磅单位显示在括号中。 1.3 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。 1.4 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====== 4.1 该测试方法可用于获得从预浸带或片材中挤出的树脂的凝胶时间。该试验是材料验收的有效措施。 4.2 凝胶时间将随试验温度而变化。本试验方法中规定的温度是处理环氧预浸料时经常使用的许多温度中的两个。如果使用其他试验温度，则应清楚地注明，如中所示 10.1.2 . 4.3 不建议将凝胶时间作为失效时间（不可接受的交联程度）的衡量标准。使用树脂流动测试方法 D3531/D3531M ，动态粘度测试方法 D4473 或动态机械程序测试方法 D7750 .

1.1 This test method covers the determination of gel time of carbon fiber-epoxy tape and sheet. The test method is suitable for the measurement of gel time of resin systems having either high or low viscosity. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.2.1 Within the text, inch-pound units are shown in brackets. 1.3 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. 1.4 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 ====== 4.1 This test method can be used to obtain the gel time of resin squeezed from prepreg tape or sheet material. This test is a useful measure for material acceptance. 4.2 The gel time will vary with the test temperature. The temperatures specified in this test method are two of many temperatures often used in processing epoxy prepreg material. If other test temperatures are used, this is to be clearly noted as indicated in 10.1.2 . 4.3 Gel time is not recommended as a measure of out time (unacceptable degree of cross-linking). Use Resin Flow Test Method D3531/D3531M , Dynamic Viscosity Test Method D4473 , or Dynamic Mechanical Procedures Test Method D7750 .