Burst Strength: Burst Strength (闭合强力)
The resistance of a closed zipper to opening when force is applied across the chain, pushing the two tapes apart. It reflects how well the slider holds the teeth together and how deeply the teeth interlock. Low burst strength allows the chain to split under body movement or packing pressure. The test is performed on a tensile tester with the slider in the closed position and results are compared with the specification.