What Is Polyethylene Terephthalate And What Is It Used For?
Oct 31, 2024| 1. The Definition of PET
Polyethylene terephthalate (PETE or PET) is the most commonly used thermoplastic polymer in the world and is better known in the textile industry by the trade name "polyester." It is a naturally transparent and semi-crystalline plastic widely used as a fiber for clothing, as an effective moisture barrier with wide applicability in bottling and packaging (known in these cases as PET or "PET resin"), and as an engineering plastic when it is combined with other materials like glass fiber or carbon nanotubes to significantly increase the material's strength. It is a naturally colorless, semi-crystalline material. Some of its most important characteristics include its resistance to water, its high strength to weight ratio, the fact that it is virtually shatterproof (it won't break like glass packaging), and its wide availability as an economic and recyclable plastic (resin identification code "1").
PET was first polymerized in the 1940s by DuPont chemists looking to develop polymer materials for use as textile fibers. It is produced from the synthesis of ethylene glycol and terephthalic acid. Even without additives to increase its strength, PET is still very strong for its light weight. This means that less material is required for uses such as plastic film for packaging. This means less fuel is required for shipping when using PET packaging. Additionally, although the material is petroleum based, approximately 40% of the energy is stored internal and is available a second time once recycled. According to PETresin.org, "life cycle studies of PET have consistently shown it to be a highly sustainable material with a positive
According to some reports, the current global demand for the material generates an annual market of about 56 million metric tons. The major end users of polypropylene are the textile industry, which (according to Wikipedia) consumes about 60% of the total. Other major uses include the bottling and packaging industry which accounts for roughly 30%.
2. What are the Characteristics of Polyethylene terephthalate?
Some of the most significant properties of Polyethylene terephthalate (PETE or PET) are:
Chemical Resistance: PET does not react with water or food which is one of the reasons it is used for consumable packaging.
Strength to Weight Ratio: PET is very strong for its lightweight.
Shatterproof: PET will not break or fracture. This makes it a great replacement for glass as a container.
Transmissivity: Polyethylene terephthalate (PETE or PET) is naturally transparent. That said, if high transmissivity is desired then plastics like Acrylic or Polycarbonate may be better choices.
3. What are the Advantages of Polyethylene terephthalate?
Polyethylene terephthalate is readily available and relatively inexpensive.
Polyethylene terephthalate has high strength to weight ratio.
Polyethylene terephthalate (PET) is very resistant to moisture.
Polyethylene terephthalate has excellent chemical resistance to organic material and water (it is not biodegradable which is good and bad depending on your perspective and its intended use).
Polyethylene terephthalate is virtually shatterproof (it won't break like glass packaging).
Polyethylene terephthalate is easily recycled. It can be reused by conducting a series of washing processes or broken down into its constituent raw materials which can then be turned into the original resin.
Polyethylene terephthalate is highly transparent.
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