Polyethylene terephthalate has high strength and stiffness. It exhibits excellent electrical insulating properties. It is very lightweight. It has good gas (oxygen, carbon dioxide) and moisture barrier properties. It has a broad range of use temperatures, from -60 to 130 °C. PET has low gas permeability, particularly with carbon dioxide.
Polyethylene terephthalate is suitable for transparent applications, when quenching during processing. It doesn't break or fracture. It is shatterproof, recyclable, and transparent to microwave radiation.
Polyethylene terephthalate is used for textiles, packaging, and other applications. Almost all single-serving and two-liter bottles of carbonated soft drinks and water sold in the U.S. are made from PET. It is also commonly used for packaging salad dressings, peanut butter, cooking oils, mouthwash, shampoo, liquid hand soap, window cleaner, and tennis balls. Special grades of PET are used for carry-home food containers and prepared food trays that can be warmed in the oven or microwave.
The advantages of Polyethylene Terephthalate as a material are that it is shatterproof, is non-reactive when in contact with food or water, and provides a high strength-to-weight ratio. Being lightweight also provides for cost savings when transporting products using PET packaging.
The glass conversion temperature of PET is about 165℃, and the temperature range of the material is 120~220℃. PET has a strong hygroscopicity at high temperatures. For glass fiber reinforced PET materials, bending deformation is very easy to occur at high temperatures. The material liquefies at high temperatures (as opposed to burning) also makes it an ideal material for recycling. Hence it is considered to be a green plastic.
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