Can You Unwarp Plastic?

How to fix a warped Tupperware lid: Fortunately, plastic can be reshaped when it becomes warped. Tupperware plastic is no different. Some people use their microwave for a minute or two and then place a flat heavy object over the warped lid to get it back into proper shape.

Can you straighten warped plastic?

My approach for fixing warps in plastic is to mechanically force the part straight, then heat the plastic up to GT for a short time, then cool it off. ... Once the plastic reaches GT you'll notice the sprue bends more easily and that it doesn't return completely to the original shape.

Can I reshape plastic?

Have your shaping object on hand and remove the plastic from the tray as soon as it comes out of the oven. Using your oven mitts, wrap the plastic around the shaping object and leave it there to cool. The plastic will then take the solid shape of the object it is wrapped around.