DIN EN ISO 4263-3:2016-05

This document (EN ISO 4263-3:2015) has been prepared by Technical Committee ISO/TC 28 "Petroleum products and related products of synthetic or biological origin", the secretariat of which is held by NEN (Netherlands), in collaboration with Technical Committee CEN/TC 19 "Gaseous and liquid fuels, lubricants and related products of petroleum, synthetic and biological origin". The responsible national committee is Working Committee NA 062-06-61 AA "Prüfung von Schmierölen, sonstigen Ölen und Paraffinen" ("Testing of lubricating oils, other oils and Paraffin") of Fachausschuss Mineralöl- und Brennstoffnormung (FAM) "(Technical Committee Petroleum, Fuels, Lubricants and Related Products (FAM)") at DIN Standards Committee Materials Testing (NMP). This part of ISO 4263 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 and ISO 15380. 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.