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What is the “Zipper Load Reciprocating Pull Test“? The Zipper Load Reciprocating Pull Test is a crucial evaluation method used to assess the durability and quality of a zipper under specific load conditions. By simulating the repetitive opening and closing actions that a zipper undergoes in actual usage, this test checks whether the zipper can maintain its functionality without damage under sustained load and repeated use. Testing Process According to the Chinese Light Industry Standards for nylon zippers, documented in QB/T 2171~2173-2001, nylon zippers must endure at least 500 cycles of reciprocating pulls to be considered of acceptable quality. Each full cycle of opening and closing the zipper is counted as a single “cycle.” Our Test Results Our waterproof zippers have undergone rigorous load reciprocating pull tests, and the results show that they can easily withstand 601 cycles without any functional failures, such as breakage, jamming, or loss of smooth operation. This d
