Petroleum and related products -- Determination of the ageing behaviour of inhibited oils and fluids -- TOST test -- Part 3: Anhydrous procedure for synthetic hydraulic fluids
ISO 4263-3:2006 specifies a method for the determination of the ageing behaviour of synthetic hydraulic fluids of categories HFDR, HFDU, HEES and HEPG as defined e.g. 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.
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