Heat Responsive Plastic Sheet

I am looking a material – plastic sheet ideally – that repsonds to heat by moving. Kinda like those red plastic fish that curl in the palm of your hand to “determine” your stress level…but in a mush thicker and more industrial form. Does this exist? Anyone have any leads?

Thanks in advance.

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Sarah Laing

It is an uncoated Cellulose film. that the fish are made out of