BS EN ISO 4263-3:2015规定了测定合成橡胶老化性能的方法 HFDU、HEES、HEPG和HETG类液压油，如ISO 12922[1]中所定义 和ISO 15380[2]。高温下氧气和金属催化剂的存在加速了老化 随着温度的升高，液体的降解随之酸值的变化。其他部分 ISO 4263规定了测定矿物油和矿物油老化性能的类似程序 液压和其他应用中使用的特定类别的耐火液体。注意流体变质的其他迹象，如形成不溶性污泥、催化剂盘管腐蚀 或粘度变化，这表明流体氧化，但未反映在计算结果中 氧化寿命。这些事件与现场服务的相关性正在调查中。这个测试 该方法可用于比较不易受水污染的流体的氧化稳定性。 然而，由于大量的现场服务应用，结果之间的相关性 测试结果和实际使用性能可能会有显著差异，最好根据经验来判断。由于实验室间数据不可用，合成液压油的本试验方法的精度未知。这 只要这些数据不可用，该方法可能不适用于规范或有争议的结果。交叉引用:ISO 3170ISO 3696:1987ISO 7537EN 10130:2007ISO 12922ISO 15380EN 13601ISO 4259ISO 6618ISO 386ISO 4263- 1ISO 4263-2:2003 ISO 3987购买本文件时，所有现行修订版均包含在购买本文件中。

BS EN ISO 4263-3:2015 specifies a method for the determination of the ageing behaviour of synthetic hydraulic fluids of categories HFDU, HEES, HEPG and HETG as defined, for example, in ISO 12922[1] and ISO 15380[2]. The ageing is accelerated by the presence of oxygen and metal catalysts at elevated temperature, and the degradation of the fluid is followed by changes in acid number. Other parts of ISO 4263 specify similar procedures for the determination of ageing behaviour of mineral oils and specified categories of fire-resistant fluids used in hydraulic and other applications.NOTE Other signs of fluid deterioration, such as the formation of insoluble sludge, catalyst coil corrosion or change in viscosity, can occur which indicate oxidation of the fluid, but are not reflected in the calculated oxidation lifetime. The correlation of these occurrences with field service is under investigation. This test method may be used to compare the oxidation stability of fluids that are not prone to contamination with water. However, because of the large number of individual field-service applications, the correlation between the results of this test and actual service performance can vary markedly, and is best judged on experience. The precision of this test method for synthetic hydraulic fluids is not known because interlaboratory data are not available. This method might not be suitable for use in specifications or in the event of disputed results as long as these data are not available.Cross References:ISO 3170ISO 3696:1987ISO 7537EN 10130:2007ISO 12922ISO 15380EN 13601ISO 4259ISO 6618ISO 386ISO 4263-1ISO 4263-2:2003ISO 3987All current amendments available at time of purchase are included with the purchase of this document.