Polyester is a class of synthetic polymers, built up from multiple chemical repeating units linked by ester (CO-O) groups. Typical polyesters are used to make permanent-press fabrics, disposable soft-drink bottles, compact discs, rubber tires and enamel paints.
The most prominent member of this class is polyethylene terephthalate, also known as PET or PP. It is a stiff, strong, clear resin with a high melting point and a long shelf life. It is spun into fibres called Dacron and Terylene and extruded into the film known as Mylar. It is also used in a variety of engineering resins.
is a plastic material with a high intrinsic viscosity and a low acetaldehyde content. It is a good substitute for oil-modified polythene materials such as LDPE and HDPE.
Depending on its processing, PET may exist both as an amorphous (transparent) material commonly known as Bright or Super Bright Chips and as a semi-crystalline material commonly known as PET Semi-Dull Chips.
Yarn grade chips or Textile grade chips are used for manufacturing various types of Polyester Filament yarns like POY, FDY and Staple Fiber in different lusters, such as Super Bright (BR Chips), Semi Dull (SD Chips) and Cationic Semi Dull and Cationic Super Bright PET Chips (CD Chips). The yarn grade chips can be blended with other synthetic fibers such as nylon, acrylic, etc and natural fibers such as wool, hemp, and cotton to produce a wide range of polyester blends.
Bottle grade chips or Film grade chips are used in making different kinds of plastic bottles such as carbonated drinks bottles, small bottles for edible oil, liquor, medicines and pet sheets, etc. These chips are mainly manufactured in China, Taiwan and South Korea.