由于环保要求和节能努力，电机绝缘材料和生产方法正在发生变化，并且在未来将发生更大的变化。面对这些变化，密封电机应用工程师需要关于新的或改进的绝缘材料的热性能、化学兼容性和预期寿命的明确信息。已经开发并描述了在制冷剂环境中评估密封电机绝缘材料的方法。其中包括使用气相色谱和质谱进行分析的密封管试验；用于测量交流和直流电导、损耗因数和电容的气溶胶管试验；和密封玻璃电池长期老化试验，并监测电性能的变化。 因此，必须在适当的制冷剂环境中对密封电机绝缘材料进行评估。在空气中进行实验室测试可能会导致有关制冷和空调应用材料的绝缘寿命和热性能的错误结论。引文:密歇根州底特律ASHRAE学报第85卷第2部分研讨会

Motor insulation materials and production methods are changing and will change more drastically in the future as a result of environmental protection requirements and energy conservation efforts. Faced with these changes, the hermetic motor application engineer needs definitive information about the thermal capability, chemical compatibility and life expectancy of new or modified insulation materials. Methods of evaluating hermetic motor insulation materials in refrigerant environments have been developed and are described. These include sealed tube tests using gas chromatography and mass spectrometry for analysis; aerosol tube tests for measurements of AC and DC conductance, dissipation factor and capacitance; and sealed glass electrical cell tests for long term aging with monitoring of changes in electrical properties. It is concluded that hermetic motor insulation materials must be evaluated in the approprlate refrigerant environment. Laboratory testing in air may lead to erroneous conclusions about insulation life and thermal capability of materials intended for refrigeration and airconditioning applications.