The zipper is a very common trimming used in clothing. It is used to lose all kinds of garments, from a jacket to a trouser , a skirt, a shirt, etc… And because it is such a used trimming, it is good to know the 8 key points for checking the quality for the zipper.

Regardless of the type of zipper, metal , coil or vision, we can make the following checks.

Lateral Resistance

This test measure the strength of the zipper tape. The lateral resistance os taken on about 2.5cmof 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 ordincary 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. It is taken on the tape at the height of the zipper stops. A pressure is applied at 90 degrees form the stop on both sides.

Slider holding capacity

For check the slider resistance. Hold the zipper at the bottom, pull the slider and drag to the top stop . The fixing resistance is measured by pulling the handle firmly.

Holding capacity of the lower area

The strength of the lower stop and the elements of the zipper are checked. Drag the slider down to the lower stop opening the teeth in opposite directions.

Lock slider capability

In this case, the resistance capacity of the interior blocking elements of the slider is measured. Slide the slider towards the centre of the zipper opening the rest towards the ends.

Puller Resistance

The puller capacity is measures by applying a force at 90 degree and 45 degree angles with respect to the slider.

Element Resitance

To check the resistance of the zipper teeth. It is done by applying a force at 90 degree 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 is not consistent to use a big size zipper on a thin fabric or vice versa.

Ultra light85-120 gr.2.5-4.0 mm.
Light120-160 gr.4.0-5.5 mm.
Average weight160-24- gr.5.5-7.0 mm.
Medium- high weight240-320 gr.7.0-8.5 mm.
Thickness320-410 gr.8.5-12.0mm

Taking into account that according to the type of zipper the mesh has one measure or another


As we said, the zipper is a trimming with a complex structure. Therefore, it is appropriate verify its quality before deciding to use one or other. A few simple checks can avoid serious problems in both production and service to our customers

How to check the quality of the Zipper

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