Single-Tooth Tensile: Single-Tooth Tensile (单牙抗张)
The force required to pull one tooth away from the tape, used to evaluate how firmly teeth are attached. For moulded resin zippers it shows the quality of the mechanical bond; for metal zippers it reflects clamping depth and wire strength. A low value predicts skipped teeth and early failure in use. Samples are taken from several positions along the chain and the lowest result is normally reported.