The main ingredient yes, but there is other stuff added to get specific properties. https://www.plasticsintl.com/blog/what-are-the-ingredients-in-plastics/ htt

The main ingredient yes, but there is other stuff added to get specific properties. https://www.plasticsintl.com/blog/what-are-the-ingredients-in-plastics/ https://www.plasticsintl.com/blog/what-are-the-ingredients-i... Just like "metal" isn't 100% Fe atoms (or Cu or whatever the base metal or metals is/are).