Zipr Shift’s zipper tape is super strong. But, so is our slider.

There exists an ASTM zipper strength test method called “Slider Tab Pull Off Strength.” This test quantifies how much energy it takes to pull the tab off of a zipper slider.

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Cam Lock Pull Tab Holder

weakest

Sliders with a cam lock mechanism easily fail in pull tab pull off strength testing. The pull tab is simply pressed on so it just has to be popped off.

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Partially Connected Pull Tab Holder

Sliders with this pull tab holder are easily snapped in half as the side that is not connected to the slider body acts as a lever in tensile testing.

Plastic deformation (seen when tensile testing metal sliders)- the pull tab holder is bent upward until it breaks in half.
Elastic deformation (seen when tensile testing plastic sliders)- the pull tab holder is bent upward until the hook on the tensile machine can slip past the pull tab holder,
akin to the pull tab sliding out of the pull tab holder.

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Fully Connected, Interference Fit Pull Tab

strongest

Zipr Shift’s pull tab holder is interference fit into the slider body. This results in a much stronger pull tab holder.
Since the pull tab holder is anchored into the slider body at two points, it is not readily snapped in half. One side can’t be used as a lever.

The tensile machine must supply enough force to break through the material which, as you can imagine, is pretty hard to do with plastic or metal.

Zipr Shift’s slider is the new standard in zipper sliders.