BS EN ISO 6743-4:2015确立了H类流体（液压系统）的详细分类 属于L类（润滑剂、工业用油和相关产品）。这本书的目的是供读者阅读 与ISO 6743-99相结合。该分类系统不包括汽车制动液或 飞机液压油。交叉引用:ISO 3448ISO 11158ISO 12922ISO 15380ISO 6743-99购买本文件时提供的所有当前修订版均包含在购买本文件中。

BS EN ISO 6743-4:2015 establishes the detailed classification of fluids of Family H (Hydraulic systems) which belong to class L (Lubricants, industrial oils, and related products). It is intended to be read in conjunction with ISO 6743-99. This classification system does not include automotive brake fluids or aircraft hydraulic fluids.Cross References:ISO 3448ISO 11158ISO 12922ISO 15380ISO 6743-99All current amendments available at time of purchase are included with the purchase of this document.