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I've bought a "Shrinky Dinks" printable sheets and now I'm feeling unsure about using it since I've read that heating polyester materials may be very harmful for health, and the final purpose of this material is to melt it at about 325°F.

Searching on the web I've noticed that the information isn't that straight forward about the product even in the official website, where they do mention about having specific certifications, but I cannot understand them fully since I'm not used to all the technical language they use.

So that's the reason why my question is about the temperature I can safely heat this material at.

Thank you for reading my question.

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