Zin dialkyl dithiophosphate is a type of anti-wear hydraulic fluid used when the ability to maintain lubrication is essential in a hydraulic system. DIN 51524 belongs to a class of detergent-containing hydraulic fluids, named HLP-D, which are useful for precipitating contaminants out of hydraulic components.
Water glycol is a fire-resistant hydraulic fluid made with de-ionized water, and it protects the machine components under especially intensive, service conditions. It is comprised of ethylene or diethylene, a heavy polyglycol, water and other water-soluble polymer thickeners. Another type of fluid is polyol-ester, which is valued in industry for its ability to break chemical bonds, merely by mixing substances.