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6199219 
Journal Article 
Multi-phase filled-plastics piston rings for non-lubricated compressors: A comparison of the performance of filled ptfe and epoxy-bonded materials in dry gases 
Atkins, BR; Maer, PS; Mitchell, PJ 
1973 
6 
4 
129-134 
In recent years the increasing demand for oil-free gases has led to the adoption of non-metallic piston rings and rod packing assemblies in reciprocating compressors. The non-metallic materials used in such applications usually consist of ptfe reinforced with one or more of a variety of fillers, the most common of which are carbon and graphite. More recently a class of composites has been introduced which comprises a mixture of solid-phase lubricants bonded with a thermosetting polymer such as phenol-formaldehyde or epoxy resin. The epoxy-bonded materials are more rigid than filled ptfe but are sufficiently elastic to be suitable for the manufacture of flexible piston rings. This paper describes the epoxy-bonded composites and compares them with filled ptfe materials in terms of their behaviour in compressors pumping very dry gases under conditions that tend to promote high rates of wear.