Accession Number : ADA289374

Title :   Evaluation of High Ester Content PAO Based Single Hydraulic Fluid in High Humidity Conditions.

Descriptive Note : Final rept. 1 Jun 93-31 Jul 93,

Corporate Author : TACOM RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI

Personal Author(s) : Purdy, Ellen M.

PDF Url : ADA289374

Report Date : NOV 1994

Pagination or Media Count : 19

Abstract : A Polyalphaolefin/Ester based Fire Resistant Hydraulic Fluid was subjected to high humidity conditions to determine water absorbance tendencies of the fluid. Fluid was subjected to 300 hours of humidification in an environment of 85% Relative Humidity. Four distinct fluid formulations containing ester contents of 34%-40% by weight were found to absorb no more than 0.25% water after the 300 hour period. A performance evaluation of the humidified fluid revealed no loss in performance regardless of the absorbed water present in the fluid. Because satisfactory performance was obtained, the hydraulic fluid formulations can contain up to 40% ester with no loss of performance. The increased ester content in the fluid formulations will provide sufficient seal swell for Army hydraulic systems that use the PAO based hydraulic fluid.

Descriptors :   *ESTERS, *HIGH HUMIDITY, *HYDRAULIC FLUIDS, TEST AND EVALUATION, OCEAN WAVES, WATER, POLYMERS, FORMULATIONS, PERFORMANCE TESTS, ELASTOMERS, ARMY EQUIPMENT, ORGANIC COMPOUNDS, FLUIDS, LOSSES, ABSORPTION, HYDRAULIC EQUIPMENT, SEALS(STOPPERS), FIRE RESISTANT MATERIALS.

Subject Categories : Organic Chemistry
      Polymer Chemistry
      Lubricants and Hydraulic Fluids

Distribution Statement : APPROVED FOR PUBLIC RELEASE