1.1本试验方法包括测定液化石油气中38°C以上风化的外来物质。 1.2通过本试验方法，含有醇类以增强其防冰性能的液化石油气可能会得出错误的结果。 1.3结果可以用测量体积或从这些体积得出的指数表示。在任何一种情况下，试验方法都提供了产品中挥发性大大低于液化石油气碳氢化合物的物质的数量和性质的指示。 1.4尽管本试验方法多年来一直用于验证丙烷的清洁度和缺乏重污染物，但其灵敏度可能不足以保护某些设备免受操作问题或增加维护的影响。 某些应用可能需要更敏感的测试，能够检测较低水平的溶解污染物。 1.5 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和健康实践，并确定监管限制的适用性。 具体预防说明见6.9。

1.1 This test method covers the determination of the extraneous materials weathering above 38°C that are present in liquefied petroleum gases. 1.2 Liquefied petroleum gases that contain alcohols to enhance their anti-icing behaviour can give erroneous results by this test method. 1.3 The result can be expressed in terms of measured volumes or indices derived from these volumes. In either case, the test method provides an indication of the quantity and nature of materials in the product that are substantially less volatile than the liquefied petroleum gas hydrocarbons. 1.4 Although this test method has been used to verify cleanliness and lack of heavy contaminants in propane for many years, it may not be sensitive enough to protect some equipment from operational problems or increased maintenance. A more sensitive test, able to detect lower levels of dissolved contaminants, may be required for some applications. 1.5 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see 6.9.