Historical
NFPA/T2.13.5-1991(R2007) First edition
Hydraulic fluid power - Industrial systems - Practice for the use of high water content fluids
Provides a general educational publication covering the following aspects of High Water Content .Fluids used in hydraulic fluid power systems: product description; mixing and control of water quality and concentration; operating temperature; foaming and aeration; corrosive properties; effects on protective coatings; wear resistant characteristics; viscosity control; fluid stability; safety in exposure to fluid; spills; contamination; effects on elastomers; piping and accessory precautions; changing fluids in a system; system design.
National Fluid Power Association [nfpa-fluid]