1.1 本试验方法提供了一种评估涂层粉末耐热性的程序，方法是确定在选定的高温下的老化时间长度，以在预先确定的验证电压下在室温下实现介电击穿。耐热性用温度指数表示。 1.2 本试验方法适用于在铜或铝基材上使用的绝缘粉末。 1.3 单位- 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，每个系统应相互独立使用。将两个系统的值结合起来可能会导致不符合标准。 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。 第节给出了具体的预防说明 7. . 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 影响绝缘材料寿命的一个主要因素是热降解。在材料被热降解削弱后，其他因素（如水分和振动）可能会导致失效。 5.2 电气绝缘只有在保持其物理和电气完整性的情况下才能在电气设备中有效。以下是热降解的潜在指标:重量变化、孔隙率、龟裂，通常是柔韧性降低。热降解通常伴随着介电击穿的最终减少。 5.3 该试验方法有助于确定涂覆在铜或铝基材上的涂层粉末的耐热性。

1.1 This test method provides a procedure for evaluating thermal endurance of coating powders by determining the length of aging time at selected elevated temperatures required to achieve dielectric breakdown at room temperature at a pre-determined proof voltage. Thermal endurance is expressed in terms of a temperature index. 1.2 This test method is applicable to insulating powders used over a substrate material of copper or aluminum. 1.3 Units— 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, each system shall be used independently of the other. Combining values from the two systems is likely to result in non-conformance with 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 precautionary statements are given in Section 7 . 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 A major factor affecting the life of insulating materials is thermal degradation. It is possible that other factors, such as moisture and vibration, will cause failures after the material has been weakened by thermal degradation. 5.2 Electrical insulation is effective in electrical equipment only as long as it retains its physical and electrical integrity. The following are potential indicators of thermal degradation: weight change, porosity, crazing, and generally a reduction in flexibility. Thermal degradation is usually accompanied by an ultimate reduction in dielectric breakdown. 5.3 This test method is useful in determining the thermal endurance of coating powders applied over a copper or aluminum substrate material.