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DIN 51524-1:2017
Pressure fluids - Hydraulic oils - Part 1: HL hydraulic oils, Minimum requirements
This document applies to hydraulic oils for hydraulic systems predominantly with hydrostatic drive in which high thermal stress leads to short periods of use for non-alloy hydraulic oils H and/or in which e. g. corrosion can occur caused by the entry of water.
Deutsches Institut für Normung [din]