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1. The self lubricationWith metal friction when the friction factor is smaller.2. The quality of lightThe density of polymer is smaller than metal, generally only a little more than half of the aluminum, help to reduce the quality of the machine.3. Easy to shapePolymer injection molding, more than 1 kg of large bearings, can use the compression molding or monomer casting molding.Molding speed, high precision, low production cost.4. The vibration absorptionPolymer bearing impact resistance, good vibration absorption.Such as car steering wheel control system adopts the polyacetal oil-retaining bearing, can prevent the pavement caused by uneven vibration to the human body, make driving more comfortable, more safety.5. ComplianceThe elastic modulus of the polymer is about 1% of the metal, so better compliance, can make the diameter of axle and bearing contact good.6. The corrosion resistancePolymer corrosion resistance is superior to the metal, and even can with water as a lubricant.Such as phthalate of phenolic resin and acrylic ester can be used as water lubricated bearing shell material.