low compressibility . Fire resistance is a property available with specialized fluids. Hydraulic fluids can contain a wide range of various chemical compounds; oils , butanol , esters (e.g. phthalates , like DEHP , and adipates , like bis(2-ethylhexyl) adipate ), polyalkylene glycols (PAG), phosphate esters (e.g. tributylphosphate ), silicones, alkylated