There are many plastics and even more polymers. We usually reserve the terme "plastic" to synthetic materials but there are plastic-like materials in nature, like amber. Polymers includes things like proteins and DNA, basically what life is made of.

So saying that releasing "bad things" (what does it even mean?) is a fundamental property of polymers is a bit too much. What "bad things"? What plastics? What dose?

Thank you, I can't edit it, but if I could I would edit my post to say "synthetic polyners"

do you have more info? I googled but didn't find anything relevant

What kind of info are you looking for? Glad to try to help

Oh, I suppose it wasn't clear, I was referring to this part:

>Check out all the urethane issues that early Disney imaganeers faced

I googled but found nothing about it. Well, it seems like google just ignored the keyword "urethane" in my search, to be specific

"While urethane can be an outstanding protective material for products such as items as small as wire or cases to items as large as residential homes, it can also be a very dangerous material. It is a recognized carcinogen, and it is hazardous to developing fetuses. Additionally, it is suspected to be toxic to the gastrointestinal system, liver, kidney, skin, and respiratory tract. It is, however, easy to prevent these dangers by wearing protective clothing and providing appropriate exhaust ventilation. It is also necessary to wash thoroughly after exposure. The risk of getting ill from urethane exposure is higher for industrial workers than residents of a community where urethane is processed, however if proper precautions are taken, adverse effects can be avoided."

https://www.thomasnet.com/articles/plastics-rubber/about-mol....