How to Check the Quality of a Zipper

How to Check the Quality of a Zipper

A zipper is a very common trimming used in clothing. It’s used to close all kinds of garments, from jackets to trousers, skirts, shirts, etc. And because it is such a used trimming, it is good to know the 8 key points for checking the quality of the zipperRegardless of the type of zipper, metal, coil or vislon, we can make the following checks.

Lateral resistance

This test measures the strength of the zipper tape.
The lateral resistance is taken on about 2.5cm. of the zipper tape. At 90 degrees of the elements of the zipper and on both sides pressure at the same time. This check is about determining the strength of the ordinary zipper.
​Method: With the zipper closed, a pressure is applied at a right angle to the belt in both directions.

Lateral resistance of the bottom stop

The resistance of the bottom stop of the closed or open zipper is checked by taking the zipper from the tape at the ends points. A pressure is applied at 90 degrees from the stop and on both sides.

Slider holding capacity

To check the slider resistance: hold the zipper at the bottom, pull the slider and drag to the higher end. The fixing resistance is measured by pulling the handle firmly.

Holding capacity of the lower area

To check the strength of the lower stop and the elements of the zipper: drag the slider down to the lower stop opening the teeth in opposite directions.

Lock lock capability

In this case, the resistance capacity of the blocking elements on the inside of the slider are measured by sliding the slider towards the center of the zipper, opening the rest of it towards the ends.

Puller resistance

The puller capacity is measured by applying a force at 90º and 45º with respect to the slider.

Element resistance

The resistance of the zipper teeth is checked by applying a force at 90 ° of the tooth of the rack.
The REACH legislation of the European Community that affects the chemical substances related to the zippers are:
  • Lead
  • Heavy metals
  • Nickel
  • Phthalate
  • Azos dyes
In addition, the zipper must be resistant to the corrosion and be free of burrs and edges.

The size of the zipper

Finally, take into account the weight of the fabric when choosing the size of the zipper. It isn’t appropriated to use a big size zipper on a thin fabric or vice versa.
Take into account that according to the type of zipper the mesh has a specific measure.
As we said, the zipper is a trimming with a complex structure. Therefore, it’s better to verify the zipper quality before deciding to use one or another. A few simple checks can avoid serious problems in both production and service to our customers.
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Olga Fuenmayor  


  • Seampedia’s Editor.
  • Fashion Technical Management / Consulting
  • Product Development / Quality control / Production control.
This article was first published at Seampedia.
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