EN ISO 4263-3:2015

European foreword
Foreword
1 Scope
2 Normative references
3 Principle
4 Reagents and materials
5 Apparatus
6 Sampling
7 Preparation of materials and apparatus
8 Procedure
9 Calculation
10 Expression of results
11 Precision
12 Test report
Annex A (normative) - Liquid-in-glass thermometer
        specifications
Annex B (normative) - Procedure for packaging and
        storage of catalyst coils
Annex C (informative) - Method for the determination of the
        insolubles content of mineral oils and anhydrous
        synthetic fluids
Annex D (informative) - Appearance rating of catalyst
        coil wires
Annex E (informative) - Determination of metals content
Bibliography

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.