1.1本规范涵盖了氯代芳烃类型的合成不可燃电绝缘液体，称为askarels，用作电容器中的电绝缘和冷却介质。本规范包括之前可用且仍在仪器中使用的液体。 1.2当电弧放电时，包含这些askarels和纤维素或其他有机材料的绝缘系统可能会产生中度易燃的气体混合物。 1.3本规范涵盖的ASKAREL有以下四种类型: 1.3.1 A类-已氯化至42重量%含量的联苯。 1.3.2 B类-已氯化至氯含量为54重量%的联苯。 1.3.3 C类-约75%类型的混合物 D2233 B和25%三氯苯。 1.3.4 D型-与A型相同，不同之处在于高沸点同系物已被去除至最大0.4%。 注1-这些声明仅是对当前常用材料的描述，不作为本规范的一部分，本规范基于表1中规定的物理和化学性质。注2:现行政府法规禁止生产和销售多氯联苯（askarels）。该方法正在维护中，以供仍在使用的装置参考。注3-有关矿物油中PCB的信息，请参阅方法D4059。

1.1 This specification covers synthetic nonflammable electrical insulating liquids of the chlorinated aromatic hydrocarbon type known as askarels, which are used as an electrical insulating and cooling medium in capacitors. This specification includes liquids that were previously available and are still in use in apparatus. 1.2 Insulation systems incorporating these askarels and cellulosic or other organic materials may, when arced, produce gaseous mixtures that are moderately flammable. 1.3 Askarels covered by this specification are of four types as follows: 1.3.1 Type A- Biphenyl that has been chlorinated to a content of 42 weight%. 1.3.2 Type B -Biphenyl that has been chlorinated to a chlorine content of 54 weight%. 1.3.3 Type C- A mixture of approximately 75% Type D2233 B and 25% trichlorobenzene. 1.3.4 Type D- The same as Type A, except that the higher boiling homologs have been removed to a maximum level of 0.4%. Note 1-These statements are merely descriptions of the materials currently in common use and are not intended as part of this specification, which is based on the physical and chemical properties prescribed in Table 1. Note 2-Current governmental regulations prohibit the manufacture and sale of polychlorinated biphenyls (askarels). This method is being maintained for reference of those units that are still in service. Note 3-For information on PCB's in mineral oils, refer to Method D4059.