Roller Type Standard: sealed roller has steel and plastic of the points. They are internal seal filled with grease. Roller conveyor direct impact on energy consumption and life of the belt. So dust seal reliable supplier of polyethylene wear roller lubrication is important to use a good standard. Quality roller is very important. Roller Application: roller drop strength. Horizontal and vertical rollers to meet the requirements after the drop test. All parts and welds does not appear damage and prolapse. After the fall of roller axial displacement of not more than 1.2mm. Roller tube and the bearing can not be loose. Roller Dust Sealing performance: After roller to 1450r / min speed of operation 200h, coal dust into the bearing grease in an amount of not more than 0.8%, idlers can still operate normally.