PTFE cap seals are two-piece hydraulic seals made of a low-friction PTFE-based sealing ring (the "cap") that is pushed against the sealing surface by an elastomer O-ring energizer. You should use them when a standard rubber seal cannot cope with high speed, low friction requirements, aggressive fluids, or wide temperature swings, such as in servo-hydraulic cylinders, mobile equipment, presses, and systems running water-glycol or biodegradable fluids. Hydraulic seals rarely get attention until something leaks. Yet the choice between a simple elastomer seal and an engineered PTFE cap seal can decide whether a cylinder runs smoothly for years or needs rebuilding every few months. This guide explains what PTFE cap seals are, how they work, where they perform best, and where they are the wrong choice.
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