MIL-H-46170 -65°F TO +275°F Chemical compatibility with O-rings, rubbers, & plastics

MIL-H-46170 is a military specification hydraulic fluid developed for aerospace and defense hydraulic systems operating across extreme temperatures from about -65°F to +275°F. These fluids provide stable viscosity, low volatility, and strong thermal stability to maintain reliable performance under high pressure conditions. They are commonly used in aircraft landing gear, braking systems, and flight control hydraulics. In such equipment, compatibility with O-rings, rubber seals, gaskets, and plastic components should be evaluated to ensure long term sealing integrity. Proper storage, contamination control, safe handling procedures, and appropriate PPE are recommended.

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