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Polyethylene Terephthalate (PET): A Comprehensive Review

Polyethylene Terephthalate (PET) PlasticPET is among those plastics which are an important part of your everyday life. It is an important commercial polymer having application ranging from packaging, fabrics, films, molded parts for automotive, electronics... and many more. You can find this famous clear plastic around you as water bottle or soda bottle container.

Explore more about polyethylene terephathalate (PET) and find out what makes it a suitable choice in several applications. Learn about its key properties, how its blends are made with other thermoplastics and thermosets, processing conditions and ofcourse, benefits that make PET as No. 1 recyclable polymer worldwide.

Properties of Polyethylene Terephthalate


Keeping information about the properties of a thermoplastic beforehand is always beneficial. This helps in selecting the right engineering thermoplastic for a particular application. It also assists in evaluating if the end use requirement would be fulfilled or not.

The table below consists Polyethylene Terephthalate properties. From its chemical properties to mechanical and thermal characteristics every attribute has been mentioned for you.

Property Value
 Dimensional Stability
 Coefficient of Linear Thermal Expansion - 8 10-5 /°C
 Shrinkage 0.2 - 3 %
 Water Absorption 24 hours 0.1 - 0.2 %
 Polyethylene Terephthalate Electrical Properties
 Arc Resistance 75 - 125 sec
 Dielectric Constant - 4 
 Dielectric Strength 60 kV/mm
 Dissipation Factor 20 - 200 10-4
 Volume Resistivity 16 1015 Ohm.cm
 Fire Performances
 Fire Resistance (LOI) 23 - 25 %
 Flammability UL94 HB
 Polyethylene Terephthalate Mechanical Properties
 Elongation at Break 30 - 70 %
 Elongation at Yield 3.8 %
 Flexibility (Flexural Modulus) 2.8 - 3.5 GPa
 Hardness Rockwell M 50 - 100 
 Hardness Shore D 85 - 95 
 Stiffness (Flexural Modulus) 2.8 - 3.5 GPa
 Strength at Break (Tensile) 45 - 70 MPa
 Strength at Yield (Tensile) 50 - 57 MPa
 Toughness (Notched Izod Impact at Room Temperature) 140 J/m
 Young Modulus 2.8 - 3.5 GPa
 Optical Properties
 Gloss 105 - 200 %
 Transparency (% Visible Light Transmission) 70 - 90 %
 Polyethylene Terephthalate Physical Properties
 Density 1.3 - 1.4 g/cm3
 Glass Transition Temperature 73 - 78 °C
 Radiation Resistance
 Gamma Radiation Resistance Good
 UV Light Resistance Fair
 Service Temperature
 Ductile / Brittle Transition Temperature -40 °C
 HDT @0.46 Mpa (67 psi) 75 - 115 °C
 HDT @1.8 Mpa (264 psi) 65 - 80 °C
 Max Continuous Service Temperature 80 - 140 °C
 Min Continuous Service Temperature -40 °C
 Others
 Sterilization Resistance (Repeated) Poor
 Thermal Insulation (Thermal Conductivity) 0.29 W/m.K
 Polyethylene Terephthalate Chemical Properties (Resistance with:)
 Acetone @ 100%, 20°C Limited
 Ammonium hydroxide @ 30%, 20°C Satisfying
 Ammonium hydroxide @ diluted, 20°C Non Satisfactory
 Ammonium hydroxide @ diluted, 60°C
 Aromatic hydrocarbons @ 20°C Limited
 Benzene @ 100%, 20°C
 Butylacetate @ 100%, 20°C Limited
 Butylacetate @ 100%, 60°C
 Chlorinated solvents @ 20°C Limited
 Chloroform @ 20°C
 Dioctylphtalate @ 100%, 20°C
 Ethanol @ 96%, 20°C Satisfying
 Ethyleneglycol (Ethane diol) @ 100%, 20°C
 Ethyleneglycol (Ethane diol) @ 100%, 50°C Limited
 Glycerol @ 100%, 20°C Satisfying
 Grease @ 20°C
 Kerosene @ 20°C
 Methanol @ 100%, 20°C Limited
 Methylethyl ketone @ 100%, 20°C
 Mineral oil @ 20°C Satisfying
 Phenol @ 20°C Non Satisfactory
 Silicone oil @ 20°C Satisfying
 Soap @ 20°C Limited
 Soap @ 60°C
 Sodium hydroxide @ 10%, 20°C Satisfying
 Sodium hydroxide @ 10%, 60°C Non Satisfactory
 Sodium hydroxide @ 10%, 90°C
 Sodium hypochlorite @ 20%, 20°C Satisfying
 Strong acids @ concentrated, 20°C Non Satisfactory
 Toluene @ 20°C Limited
 Toluene @ 60°C Non Satisfactory
 Xylene @ 20°C Limited



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