The hardest part about responding to everyone’s testing questions is… so many don’t apply.
Not only do many zipper consumers not understand the testing requirements of current zippers, but they’re all stuck in a mindset of nitpicking between the exact same things.

All toothed zippers look and function the same/similarly.
Other zipper companies make coil, metal, and plastic molded zips.

I’ve tried to wholly compare my zipper to the ASTM standards for old-fashioned zippers.
But, it’s hard.

Zipr Shift does not make toothed fasteners.

There are ZERO TEETH in Zipr Shift zippers.

NONE. NADA. ZILCH.

Our zippers don’t have teeth. So, any test that has to do with testing teeth doesn’t apply.

Our zippers are made to fail in less ways than current zippers fail.
And, a lot of that has to do with not having teeth.
You’re welcome! (haha)

No more teeth falling off the zipper tape.
IMPOSSIBLE. No teeth.

No more teeth getting jammed in fabric.
IMPOSSIBLE. No teeth.

No more teeth not aligning and opening up.
IMPOSSIBLE. No teeth.

Specific Tests:

Reciprocating Test-

This is the test everyone loves. But for what?

This test was basically created after zippers used to be made BY HAND.
And when you make things by hand, sometimes the precision is a little off… and so if you go to zip up or down, something wouldn’t interlock the right way, if at all.
Well… now people use heavy machinery and equipment programmed to form a precise shape to extreme tolerances.

When is the last time an entire batch of zippers has failed the reciprocating test?
My guess is likely when a modern machine is wonky and needs calibration…
Or in the 1930s before the genius founder of YKK produced the first zipper machines.
And directly after that when YKK held the patents on making super precise zippers and they could show all competitors’ zippers failing the test (which is how they got their renown for strength and durability in the industry…)

But, now, anyone can own, make, and use the machinery required to make a great toothed zipper. So hardly anyone’s zippers fail this unless they’re using cheaply calibrated and produced machinery.

Eventually the slider will open a little bit but one can easily fix that with pliers.

Hopefully, everyone understands this test a little more… and I get less inquiries about it.