|Young modulus(E)||2800–3100 MPa|
|Tensile strength(σt)||55–75 MPa|
|Elongation @ break||50–150%|
|notch test||3.6 kJ/m2|
|Glass temperature||75 °C|
|melting point||260 °C|
|Vicat B||170 °C|
|Thermal conductivity||0.24 W/m.K|
|linear expansion coefficient (α)||7×10−5/K|
|Specific heat (c)||1.0 kJ/kg.K|
|Water absorption (ASTM)||0.16|
|source: A.K. van der Vegt & L.E. Govaert, Polymeren, van keten tot kunstof, ISBN 90-407-2388-5|
Polyethylene terephthalate (aka PET, PETE or the obsolete PETP or PET-P) is a thermoplastic polymer resin of the polyester family. The chemical industry makes it. It is used in synthetic fibers; beverage, food and other liquid containers; thermoforming applications; and engineering resins often in combination with glass fiber. It is one of the most important raw materials used in man-made fibers. It is also used as the dielectric in multi-purpose capacitors (K73-16 series).
Depending on its processing and thermal history, it may exist both as an amorphous (transparent) and as a semi-crystalline (opaque and white) material. Its monomer can be synthesized by the esterification reaction between terephthalic acid and ethylene glycol with water as a byproduct or the transesterification reaction between ethylene glycol and dimethyl terephthalate with methanol as a byproduct. Polymerization is through a polycondensation reaction of the monomers (done immediately after esterification/transesterification) with ethylene glycol as the byproduct (the ethylene glycol is recycled in production).
The majority of the world's PET production is for man-made fibers (in excess of 60%) with bottle-making accounting for around 30% of global demand. In discussing cloth uses, PET is generally referred to as simply "polyester" while "PET" is used most often to refer to packaging applications.
A PET bottle (containing mineral water)
sails are often made of PET-fibers.