MIL-H-46170 -55°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 systems operating in extreme environments from approximately -55°F to +275°F. These fluids provide stable viscosity, low volatility, and strong thermal stability for reliable operation under high pressure. They are commonly used in aircraft hydraulic systems including landing gear, braking assemblies, and flight control actuators. In these systems, compatibility with O-rings, rubber seals, gaskets, and plastic components should be evaluated to ensure long term sealing performance. Proper storage, contamination control, safe handling practices, and appropriate PPE are recommended.

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