a polymer that can't be reprocessed

a polymer under pressure

a polymer that can be repeatedly melted and solidified by heating and cooling

a polymer that crashes irreversibly

Does not affect

At higher temperatures the density is lower

At higher temperatures the density is higher

they are improving

at first improve, then deteriorate

does not change

yes, using salt water

yes

no

Plastic consisting of semi-arranged areas of macromolecules

Plastic with no regular arrangement of macromolecules

A plastic having a regular crystalline structure

Engineering plastics

Commodity plastics

Various groups

irregular structure and very good transparency (up to 93% of light passes through)

regular structure and lack of transparency (up to 7% of light passes through)

yes

no

clear as glass

Engineering plastics

Commodity plastics

Different groups