润滑剂、工业用油和相关产品（L类）.H系列（液压系统）.HFAE、HFAS、HFB、HFC、HFDR和HFDU类液压油规范

[中文适用范围]： 本文件规定了一般工业应用中静压和流体动力系统中未使用的耐火和不易燃液压油的最低要求。 它不适用于有不同要求的航空航天或发电应用。 它为这些危害较小的流体的供应商和最终用户以及使用这些流体的液压设备的制造商提供了指导。 ISO 6743-4 对液压应用中使用的不同类型的流体进行了分类，其中涵盖的类别中，本文件仅详细介绍了以下类别：HFAE、HFAS、HFB、HFC、HFDR 和 HFDU。 HFAE、HFAS、HFB、HFC 和 HFDR 类型是 ISO 5598 定义的“耐火”流体。 大多数 HFDU 流体虽然在燃烧性能上比矿物油有所改善，但不属于该定义范围，更恰当地被认为是“阻燃”流体。 易燃”液体。 [外文原描述]： This document specifies the minimum requirements of unused fire-resistant and less flammable hydraulic fluids for hydrostatic and hydrodynamic systems in general industrial applications. It is not intended for use in aerospace or power-generation applications, where different requirements apply. It provides guidance for suppliers and end users of these less hazardous fluids and to the manufacturers of hydraulic equipment in which they are used. Of the categories covered by ISO 6743-4, which classifies the different types of fluids used in hydraulic applications, only the following are detailed in this document: HFAE, HFAS, HFB, HFC, HFDR and HFDU. Types HFAE, HFAS, HFB, HFC and HFDR are "fire-resistant" fluids as defined by ISO 5598. Most HFDU fluids, while displaying an improvement in combustion behaviour over mineral oil, fall outside this definition and are more appropriately considered as "less flammable" fluids.