USE OF WEAR RING Wear rings are used as bearings of a piston to prevent scuffing the piston and cylinder, minimize eccentricity, and improve durability of packings. Type WR RYT Shape Material Fabric-reinforced phenol resin Tetrafluoroethylene resin Features Standard wear ring. Biascutting is made at one spot. Excellent wear resistance. It is made into a hoop (10m per roll) and used by cutting to required length. Low friction resistance. PV limit (in oil) See the following chart for PV limit.