Molded Plastic vs Nylon Coil Zippers
Strength, Long Term Durability and Ease of Repair
Both types of zippers feature their own strengths and weaknesses. Nylon Coil zippers possess stronger horizontal pull-strength against separation which is why they are often found on travel luggage or other items prone to overstuffing. However, because the Nylon Coil teeth are sewn onto the zipper tape, it’s possible for the teeth to separate at this potential weak point.
While the Nylon Coil zipper is “stronger” than the Molded zipper under ideal conditions, its teeth’s coil design is more prone to trapping dust, debris and contamination and therefore will prematurely wear out without proper cleaning and lubrication. Conversely, Molded zippers feature separate individual teeth that are directly molded to the tape and intrinsically excel at shedding impurities. Furthermore, the Acetal material is inherently self-lubricating and provides for long-term low-maintenance use. Because of these characteristics, Molded zippers tend to have a longer service life when compared against Nylon Coil zippers.
That said, Nylon Coil zippers are “self-healing,” meaning when the zipper accidently opens or closes incorrectly and skips a tooth, these misalignments are easily correctable by merely zipping the slider over the problematic area. On the contrary, misalignments on a Molded zipper usually indicates or results in a damaged tooth, which oftentimes renders the entire zipper inoperable and requires a full zipper replacement.
Ease of Application and Use
The suppleness and flexibility of Nylon Coil zippers allows easier sewing and smoother operation within curved arcs. Molded zippers excel at long straight line pulls but can also be sewn around slight curves that are not too aggressive.
Without the addition of weatherproofing (e.g., a PU coating over the zipper binding tape, or an exterior storm flap), both Nylon Coil and Molded zippers will allow wind and moisture to penetrate its teeth. Nylon Coil zippers have coils that are sewn on top of the zipper binding tape and therefore are inherently more wind and water resistant than Molded zippers. If the binding tape is sealed with a waterproof PU coating, the zipper then becomes extremely water resistant. Perfectex also supplies PU-coated Water-Resistant zippers as a special-order item.
Disclaimer: Please note that each customer is responsible for testing these zippers under their own conditions to determine suitability for their application prior to ordering for actual use. We strongly encourage utilizing a sample for testing.