PET is a semi-crystalline polymer, therefore according to its thermal history, its morphology can be completely amorphous, when it has been cooled quickly, or partially crystalline.

Although most of the PET resins that are markets have be crystallized and post-condensed to increase the intrinsic viscosity, PET resins in amorphous state also find applications.

PET is a semi-crystalline polymer, therefore according to its thermal history, its morphology can be completely amorphous, when it has been cooled quickly, or partially crystalline.

Although most of the PET resins that are markets have be crystallized and post-condensed to increase the intrinsic viscosity, PET resins in amorphous state also find applications.