1.1 通过交联在乙烯塑料中产生的凝胶含量（不溶性部分）通过用溶剂如十氢萘或二甲苯提取来测定。本文所述的方法适用于所有密度的交联乙烯塑料，包括那些含有填料的交联乙烯，并且所有这些方法都提供了对那些化合物中的一些化合物中存在的惰性填料的校正。 1.2 试验方法A允许在最短的时间内进行最完整的提取，将用于裁判试验，但也描述了两种可供选择的非裁判试验方法B和C。试验方法B与裁判试验方法的区别仅在于样品制备；也就是说，它要求使用在电缆绝缘的选定点采集的刨花，而不是裁判测试方法要求的地面样本。 由于剃掉的颗粒较大，每个样品暴露于萃取剂的总表面较少，因此该测试方法通常产生约1至2的萃取值 % 低于裁判方法。试验方法C要求在110°C的恒定温度下，在二甲苯中提取一件样品。在这种温度下，使用单件样品，提取次数更少（从3到9 % 小于裁判试验方法），该方法允许确定溶胀比（凝胶相中交联度的量度）。 1.3 提取测试是对任何形状的物品进行的。它们对电绝缘特别有用，因为试样可以从绝缘材料中最容易发生交联不足的部分中选择。 1.4 以国际单位制或英寸磅单位表示的数值应单独视为标准。每个系统中规定的值不一定是完全相等的；因此，为了确保符合标准，每个系统应独立使用，并且不得将两个系统的值组合使用。 注1: 此测试方法相当于ISO 10147，方法B。它在任何其他测量或章节中都不等同于ISO 10147。 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 具体的预防说明见第节 6. , 9 和 24 . 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 交联乙烯塑料的许多重要性能随凝胶含量的不同而变化。因此，凝胶含量的测定提供了控制过程和评定成品质量的手段。 5.2 提取试验允许验证任何给定交联乙烯塑料的适当凝胶含量，也允许比较不同的交联乙烯塑料，包括含有填料的交联乙烯，条件是后者满足以下条件: 5.2.1 在提取温度下，填料不溶于十氢萘或二甲苯。 5.2.2 存在于化合物中的填料的量是已知的，或者将通过其他方式确定。 5.2.3 已经实现了足够的交联以防止填料在提取过程中迁移。通常已经发现，在高达50的提取水平下 %, 萃取剂保持澄清且不含填料。 5.3 将合适的抗氧化剂添加到萃取剂中，以在萃取温度下抑制可能的氧化降解。 5.4 在进行本试验方法之前，应参考所试验材料的规范。材料规范中涵盖的任何试样制备、处理、尺寸或试验参数，或其组合，应优先于本试验方法中提及的试样。 如果没有材料规范，则应用默认条件。

1.1 The gel content (insoluble fraction) produced in ethylene plastics by crosslinking is determined by extracting with solvents such as decahydronaphthalene or xylenes. The methods described herein are applicable to crosslinked ethylene plastics of all densities, including those containing fillers, and all provide corrections for the inert fillers present in some of those compounds. 1.2 Test Method A, which permits most complete extraction in least time, is to be used for referee tests, but two alternative nonreferee Test Methods B and C are also described. Test Method B differs from the referee test method only in sample preparation; that is, it requires use of shavings taken at selected points in cable insulation, for example, rather than the ground sample required by the referee test method. Because the shaved particles are larger, less total surface per sample is exposed to the extractant, so this test method ordinarily yields extraction values about 1 to 2 % lower than the referee method. Test Method C requires that a specimen in one piece be extracted in xylenes at a constant temperature of 110°C. At this temperature and with a one-piece specimen, even less extraction occurs (from 3 to 9 % less than the referee test method), this method permits swell ratio (a measure of the degree of crosslinking in the gel phase) be determined. 1.3 Extraction tests are made on articles of any shape. They have been particularly useful for electrical insulations since specimens can be selected from those portions of the insulation most susceptible to insufficient crosslinking. 1.4 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. Note 1: This test method is equivalent to ISO 10147, Method B. It is not equivalent to ISO 10147 in any other measurement or section. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Sections 6 , 9 , and 24 . 1.6 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 Many important properties of crosslinked ethylene plastics vary with the gel content. Hence, determination of the gel content provides a means of both controlling the process and rating the quality of finished products. 5.2 Extraction tests permit verification of the proper gel content of any given crosslinked ethylene plastic and they also permit comparison between different crosslinked ethylene plastics, including those containing fillers, provided that, for the latter, the following conditions are met: 5.2.1 The filler is not soluble in either decahydronaphthalene or xylenes at the extraction temperature. 5.2.2 The amount of filler present in the compound either is known or will be determined by other means. 5.2.3 Sufficient crosslinking has been achieved to prevent migration of filler during the extraction. Usually it has been found that, at extraction levels up to 50 %, the extractant remains clear and free of filler. 5.3 A suitable antioxidant is added to the extractant to inhibit possible oxidative degradation at the extraction temperatures. 5.4 Before proceeding with this test method, reference shall be made to the specification of the material being tested. Any test specimen preparation, conditioning, dimensions, or testing parameters, or a combination thereof, covered in the materials specification shall take precedence over those mentioned in this test method. If there are no material specifications, then the default conditions apply.