flexible tab

hi! i got a question about the first project i'm developing
i got a pocket, to get cards in place i think at tab that keep firmly down the card, like clips
what i need to know is how much the "strong and flexible plastic" is, exactily!, flexible for example, a tab 1mm thick, 20mm long and 10mm wide how much mms can flex without breaking? is possibile 4mm?
something like this: (the black line is the clip in its "natural" shape, the grey line is the clip pulled at maximum height)




many thanks!

matteo (italia)

Non scientific answer: I think you'll be okay. How thick you make the flexible tab will control how much flexing it can do.
I would suggest watching this video:
https://www.youtube.com/watch?v=wXgbJB9v6Zk

wow! very flexible indeed

who's the videomaker? it's possible to know how thick the piece of the video is?

"less than a millimeter" was the answer given by the author in response to this question,
in case you did not notice that in the comments section below the video. The lower bound
is of course supplied by the design guidelines for the strong&flexible material, i.e. at least 0.7mm