Macromolecule roller complete waterproof,dust proof,rust proof,long working ... frame, groove-shape forward inclined idler frames.high ploymer roller, macromolecule roller,UHMW-PE roller1. High wear-resistance, low friction ... , aging, flame resistance, acid and alkali resistance4. can stand impact and vibration5. the temperature will be -40--80 Celsius ... 3-5 times of the metal ones Macromolecule roller