Q: Does zipper tape material affect performance?
Considerably. The tape carries the stitch load, controls shrinkage and determines how the chain behaves after washing. Most garment zippers use woven polyester tape because it is strong, low-shrink and colorfast. Cotton tape is chosen when the garment will be piece-dyed or when a softer hand is needed, but it can shrink 3 to 5 percent and may bleed shade.
Construction also matters. A denser weave resists needle damage and edge fraying, while a heavier yarn improves tensile strength at the seam. Tape thickness affects how the zipper sits under a presser foot: too thin and the seam puckers, too thick and the needle deflects. Coating or lamination adds water resistance but reduces flexibility and can delaminate if the tape is over-heated during pressing.
For critical programs, ask for the tape composition, weight per square meter, shrinkage after washing and colorfastness rating. Test a sewn sample through the actual wash and dry cycle, because tape shrinkage that looks negligible on a bench can produce a wavy seam after three home launderings. If the tape and the shell fabric shrink differently, the zipper will pucker regardless of chain quality.