QB/T 2172: QB/T 2172 (拉链技术要求)
A Chinese standard that sets technical requirements, test methods and inspection rules for zippers. It defines performance levels for pull strength, stop strength, cycle life, colour fastness and plating corrosion, and describes sampling and acceptance criteria. It is a common basis for domestic quality agreements and incoming inspection. Suppliers prepare test reports for each lot, and buyers may add stricter limits in their own purchase specifications.