which the chemical processes used to make them are reversible or not.

Thermoplastics do not undergo chemical change in their composition when heated and thus can be molded repeatedly. Examples include polyethylene (PE), polypropylene (PP), polystyrene (PS), and polyvinyl chloride (PVC).

Thermosetting polymers, also known as thermosets, can melt and take shape only once: after they have solidified, they stay solid and retain their shape permanently. If

1.Previous
3.Next