Could not find a truly appropriate place to post this issue (my apologies, the google has failed me for the first time).
I bring in pallets of UHMW (1/4"X48"X120") in quantities of 40-50 per pallet and 3-4 pallets at a time. I bring one pallet into my shop and store it on a rack that we have built to be perfectly (eye balled and leveled) flat with 1/4" steel.
I have tried both leaving the pallet on the shelf and hand unloading the sheets directly onto the flat steel. Over time, and sometimes not very long at all the UHMW begins warping. Sometimes it creates a wave, sometimes the corners warp up (I could understand gravity pulling them down but the go opposite, almost as if the center is being pulled down.
There seems to be a pattern with it. Once one sheet begins warping, they all follow suit. It is never in the same spot or to the same degree.
Does anyone have any idea how to stop this or minimize this from happening?