In aerospace auxiliary and air management systems, piston rings are often exposed to conditions that challenge traditional materials — high temperatures, oil-free operation, and continuous cycling.

Metcar’s carbon-graphite piston rings are engineered specifically for these environments, supporting reliable performance in applications where lubrication is limited or eliminated altogether.

Designed for severe aerospace service, Metcar piston rings are commonly used in:

• Auxiliary Power Units (APUs)
• Bleed air and butterfly valves
• Oil-free, high-speed compressors
• Propulsion and air management systems

Why MRO teams specify carbon-graphite piston rings:

• Self-lubricating operation for oil-free environments
• Stable sealing with low friction
• Dimensional stability at elevated temperatures
• Rated for continuous service up to 850°F (450°C), with intermittent exposure up to 1200°F (650°C)
• Custom single-piece or segmented ring designs available

Beyond the material itself, Metcar supports aerospace and MRO teams with engineering expertise at every step, including grade selection, ring and groove optimization, and leak-flow testing on every part to certify performance in critical applications.

With decades of experience supporting aerospace platforms worldwide, Metcar provides piston ring solutions designed for reliability, repeatability, and long service life in demanding MRO environments.

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