PET
Polyethylene terephthalate is a thermoplastic material produced by poly
condensation method in polyester family.
Polyethylene terephthalate is polar. Being polar, force of gravity of intermolecular is huge. PET Molecules are created without linear and net. Both of these features are required for semi-crystal and facer. Since PET molecules are linear and free-net, it is resistant to bending and does not deform at 80 °C. Its resistance to impact is delicate.
Softening temperature is approximately is between 70 °C and 80 °C. Melting point is between 235 °C and 260 °C depending on crystallization and polymerization degree. It is very light. It can be used as a gas and humid barrier. It is hard and resistant to impacts. It is used at between 0, 60 mm and 1, 00 mm.