Meaning
Strong and transparent polyester resin belongs to the family of thermoplastic polymers used extensively in packaging and engineering applications. While often associated with beverage bottles, polyethylene terephthalate is also a versatile material for high-precision injection moulded components. Its properties include excellent chemical resistance and a high strength-to-weight ratio.
Material Molecular
Molecular structure of this resin allows it to exist in both amorphous and semi-crystalline states depending on the cooling rate. In its crystalline form, polyethylene terephthalate provides high thermal stability and can withstand temperatures above two hundred degrees Celsius. This makes it suitable for parts that must survive the intense heat of an automotive engine bay.
Processing Successful
Successful moulding requires careful management of the thermal profile and the moisture content of the resin. Because polyethylene terephthalate is highly susceptible to hydrolysis, the pellets must be dried to very low levels before they enter the barrel. Failure to dry the material leads to a rapid loss of viscosity and brittle parts.
Application Industrial
Industrial grades are often reinforced with glass fibers to improve their stiffness and dimensional stability. These composites of polyethylene terephthalate are used in electrical connectors and pump housings. The material is a staple of modern manufacturing due to its balance of cost and performance.
