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DEVELOPMENT OF A LONG LIFE O-RING COMPOUND FOR USE IN AIRCRAFT HYDRAULIC SYSTEMS USING MIL-H-5606 FLUIDS AT PRESSURES UP TO 3000 PSI AND TEMPERATURES RANGING FROM -65 F TO +275 F
FAIRCHILD HILLER CORP FARMINGDALE NY REPUBLIC AVIATION DIV
This report describes the program for the development of a long life O-ring compound for use in aircraft hydraulic systems using MIL-H-5606 fluids at pressures up to 3000 psi and temperatures ranging from -65 F to 275 F. Compounding and blending efforts conducted during the program explored fluoroelastomers, polyacrylates, butadiene-acrylonitrile copolymers, epichlorohydrin elastomers, propylene-oxide rubber, polyurethane elastomers, chlorosulfonated polyethylenes, silicons, and others. Static and dynamic O-ring evaluations conducted on MIL-P-25732 buna N compounds confirmed contentions that this compound has limited heat resistance at 275 F, especially when it experiences some exposure to air. The same tests conducted on MIL-R-25897 fluoroelastomer compounds have shown that they have poor compression set characteristics, low temperature limitations, and poor extrusion resistance. Two compounds developed during the program exhibited performance superior to the aforementioned Military Specification compounds when evaluated in static and dynamic O-ring tests. The first of these compounds utilized Hydrin 200, a copolymer of epichlorohydrin with ethylene oxide the other was an ECD-487 low temperature Viton compound.
Summary technical rept. 1 Jul 1964-1 Mar 1966
Approved for public release; distribution is unlimited.