According to our technicians in the production of brushes, brush rollers, steel wire brushes and industrial brushes, the main method used to check the quality of export products in the world is sampling inspection. According to the actual number of boxes for export inspection, 4 boxes are opened under 50 boxes; for 50-100 boxes, 1 box is opened for every 10 boxes; for 100 boxes or more, 1 box is opened for every additional 20 boxes, and less than 20 boxes are counted as 20 boxes. According to the stacking situation, draw from the top, middle, bottom or left, middle, and right parts. Open 2 boxes per box for appearance inspection; take 2 boxes from each box for quality inspection. One 2m box ruler, one 150mm vernier caliper, one 0-50kg tensile machine with a pulling speed of 100mm/min. Our company is a professional manufacturer of brushes, with advanced production technology and professional staff. If you need it, please feel free to contact us and we will answer you in the most professional manner! We look forward to cooperating with you! Welcome! Log in to www.mxbrushmachinery.com