1. Special properties:Rare earth and nanometer strengthened engineering plastic is a kind of new engineering plastic successfully developed by our company recent years. It is the optimum material instead of the mental material of steel, copper and aluminum, etc.All kinds of products made of the material can ne directly instead of metal materialbut not to change the original designing size, the properties of strength, stiffnessand fatigue can meet to the requirements.(1) Light weight: reducing dead weight at the end of a boom, this provides mobile cranes with greater stability and lifting capability.(2) Improved wire rope life: self- lubricating, hardness lower than steel rope.(3) Wear resistance: 8.8 times of steel, 8.3 times of copper.(4) Improved the property of crane, little or non maintenance.(5) Corrosive resistance: non-corrosive benefits for sea use.2. Application:Wire rope sheave, roller, gear, shaft sleeves, supporting wheel, locating wheel,worm wheel, chain wheel, synchromesh band wheel, pulley, hopper sheave, walkingwheel, maintenance free bearing, etc.