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PET

PET

PET

Polyethylene terephthalate (PET or PETE), a strong, stiff synthetic fiber and resin, and a member of the polyester family of polymers. PET is spun into fibers for permanent-press fabrics, blow-molded into disposable beverage bottles, and extruded into photographic film and magnetic recording tape. PET is produced by the polymerization of ethylene glycol and terephthalic acid. Ethylene glycol is a colorless liquid obtained from ethylene, and terephthalic acid is a crystalline solid obtained from xylene. Applications: CSD, carbonated water, edible oil, alcoholic beverage, pharmaceuticals, wide mouth jars, APET sheet, strapping

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.

PET

PET Characteristics

Some of the most significant properties of Polyethylene terephthalate (PETE or PET) are:

  1. Chemical Resistance: PET does not react with water or food which is one of the reasons it is used for consumable packaging.   
  2. Strength to Weight Ratio: PET is very strong for its lightweight.
  3. Shatterproof: PET will not break or fracture. This makes it a great replacement for glass as a container.
  4. 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.

PET Advantages

  1. Polyethylene terephthalate is readily available and relatively inexpensive.
  2. Polyethylene terephthalate has a high strength to weight ratio.
  3. Polyethylene terephthalate (PET) is very resistant to moisture.
  4. 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).
  5. Polyethylene terephthalate is virtually shatterproof (it won’t break like glass packaging).
  6. 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.
  7. Polyethylene terephthalate is highly transparent.

PET Disadvantages

  1. Polyethylene terephthalate is somewhat susceptible to oxidation (for example, it is not typically used for beer or wine storage because the shelf life of these beverages is expected to be long enough such that some taste degradation might occur before the item is consumed).
  2. Polyethylene terephthalate is not biodegradable (which is good and bad depending on your perspective and its intended use).

PET Properties

 

Property

Value

Technical Name

Polyethylene terephthalate (PET or PETE)

Chemical Formula

(C10H8O4)n

Melt Temperature

500°F (260°C)

Typical Injection Mold Temperature

74 - 91 °C (165 - 195 °F) ***

Heat Deflection Temperature (HDT)

70 °C (158 °F) at 0.46 MPa (66 PSI) **

Tensile Strength

152 MPa (22000 PSI) *** W/ 30% Glass Fiber

Flexural Strength

221 MPa (32000 PSI) *** W/ 30% Glass Fiber

Specific Gravity

1.56

Shrink Rate

0.1 - 0.3 % (.001 - .003 in/in) ***

 

PET Grides 

-BG820S & BG780N

Polyethylene terephthalate (PET or PETE), a strong, stiff synthetic fiber and resin, and a member of the polyester family of polymers. PET is spun into fibers for permanent-press fabrics, blow-molded into disposable beverage bottles, and extruded into photographic film and magnetic recording tape. PET is produced by the polymerization of ethylene glycol and terephthalic acid. Ethylene glycol is a colorless liquid obtained from ethylene, and terephthalic acid is a crystalline solid obtained from xylene.

Applications:

CSD, carbonated water, edible oil, alcoholic beverage, pharmaceuticals, wide mouth jars, APET sheet, strapping

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