Polyethylene terephthalate (PET) is probably the most important polyester. It is obtained by an esterification reaction between ethylene glycol (MEG) and terephthalic acid (PTA) to produce the low viscosity monomer in the first stage. The esterified material is then transformed into a high molecular polymer in a polycondensation reaction. The PET polymer is a transparent, lightweight, strong, safe, shatterproof and recyclable material. PET in its natural state is colourless and semi-crystalline. Depending on the processing method, the PET can be semi-rigid to rigid, and it is also especially light in weight. PET makes an excellent gas and moisture barrier.
PET resin is also very sustainable as it is recyclable. It is by far the world's most recycled plastic. PET can be recycled many times – and used in food applications, personal care products, carpets, clothing and many other Products.
Polybutylene Terephthalate is the synthetic thermosplastic compound of 1-4-Butylene glycol with DMT or PTA. It was widely used in electronic, electrical, communications, fiber optics and automotive industires.
There are two kind of PBT product - PBT Resin and PBT compound.
PBT Resin is the base resin while PBT compound are combination of PBT resin, fiber glass filling and other additives such as UV protection agent, and flame retardant.