Evaluation of Environmentally Acceptable Hydraulic Fluids.

TLDR

The study evaluates environmentally acceptable hydraulic fluids made from vegetable oils and synthetic esters. The evaluation assessed viscosity, flammability, corrosion and wear protection, thermal and oxidation stability, low‑temperature capability, elastomer compatibility, and storage stability. Vegetable‑based fluids were limited to –10 °C to 90 °C due to poor thermal and low‑temperature stability, whereas synthetic ester fluids operated from –40 °C to 150 °C and could meet military mobile hydraulic requirements, but overall EA fluids did not satisfy current military specifications yet remain potential replacements for some petroleum‑based fluids. The other section contains minimal metadata: jg.

Abstract

Abstract : This describes the laboratory evaluation of environmentally acceptable (EA) commercial hydraulic fluids formulated with vegetable oils and synthetic esters. Evaluations included viscosity, flammability, corrosion and wear protection, thermal and oxidation stability, low temperature capability, elastomer compatibility, and storage stability. Results showed the vegetable based products were limited in operational temperature ranges (-10 deg C to 90 deg C) due to poor thermal and low temperature stabilities. On the other hand, synthetic ester based fluids showed a wide operational capability (-40 deg C to 150 deg C) which can meet the requirements of military mobile hydraulic fluids. Although EA hydraulic fluids did not meet the current military specification requirements they are potentially good candidate fluids for the replacement of some current petroleum based military hydraulic fluids. jg