Quality is one of the factor that helped the business to achieve success, so we strive to provide qualitative business. Quality priority is our quality target. We keep own lab room and full set test facilities. Study customers' datasheet and drawing firstly together by technical department, product department and QC deparment to make sure all of us are in the same page. Our QA and QC department test every roll of felt and keep the record for tracking, our quality control colleagues test filter bag at least three times each PO for the first sample and middle exam and final inspection for shipping, also at least three times inspection for cages of vertical, coating, tension etc. if any defect happened, immediately detail check and adjust and frequency check till everything finished. All QC files will be kept for one year.