Accession Number : AD0812881

Title :   EVALUATION OF CANDIDATE FIRE-RESISTANT HYDRAULIC FLUIDS.

Descriptive Note : Final rept. 20 May-20 Nov 66,

Corporate Author : DOUGLAS AIRCRAFT CO INC SANTA MONICA CA MISSILE AND SPACE SYSTEMS DIV

Personal Author(s) : Seil, C. A. ; Bouchez, L. T. ; Skyrus, J. P.

Report Date : APR 1967

Pagination or Media Count : 112

Abstract : The objectives of this program were to characterize thirteen candidate hydraulic fluids for flammability, miscibility, elastomer compatibility and steel-on-steel wear, to determine the feasibility of directly substituting a less flammable fluid for the MIL-H-5606 fluid currently used in most military aircraft. Evaluation in a pump test loop has been performed on MIL-H-5606B and on two of the candidate fluids. No completely nonflammable fluid is compatible with MIL-H-5606 fluid or Buna N elastomers. Three of the thirteen fluids are recommended for further consideration: Oronite 8515, Esso 3158, and Dow Corning XF-1-0302. Oronite 8515 shows some improvement in fire resistance over MIL-H-5606B and would not require operational temperature limitations if used as a replacement fluid. Reduced lubricity of highly loaded hydraulic system components (as compared to MIL-H-5606 fluid) is indicated however, by the performance of Oronite 8515 in a pump test loop. Some improvement in fire resistance over MIL-H-5606B and Oronite 8515 is shown by Esso 3158. The greater viscosity and higher pour point of the latter fluid would impose some operational temperature limitations on MIL-H-5606 fluid hydraulic systems. Dow Corning XF-1-0302 fluid shows marked improvement in fire resistance over MIL-H-5606B and is compatible with Buna N elastomers. Pump testing of this fluid is recommended to provide complete evaluation data. (Author)

Descriptors :   (*HYDRAULIC FLUIDS, FIRE SAFETY), AIRCRAFT, MILITARY REQUIREMENTS, SOUTHEAST ASIA, ENVIRONMENTAL TESTS, TEMPERATURE, PERFORMANCE(ENGINEERING), PHYSICAL PROPERTIES, FLUID FLOW, VISCOSITY, SYNTHETIC RUBBER, ACCEPTABILITY, WEAR RESISTANCE, FLAMMABILITY, COMPATIBILITY.

Subject Categories : Aircraft
      Lubricants and Hydraulic Fluids
      Safety Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE