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Plastics & Elastomers
Polyethylene Terephthalate (PET): A Comprehensive Review

Polyethylene Terephthalate (PET) Properties

PET has many other attractive properties like high strength and toughness, good abrasion and heat resistance, low creep at elevated temperatures, good chemical resistance, and excellent dimensional stability. Learn more about all PET properties and their values - ranging from mechanical to electrical to chemical properties, to make right selection for your application.

Key Applications

Key Properties

Property POLYETHYLENE TEREPHTHALATE
Chemical Resistance
Acetone @ 100%, 20°C Limited
Ammonium hydroxide @ 30%, 20°C Satisfying
Ammonium hydroxide @ diluted, 60°C Non Satisfactory
Ammonium hydroxide @ diluted, 20°C Non Satisfactory
Aromatic hydrocarbons @ 20°C Limited
Benzene @ 100%, 20°C Limited
Butylacetate @ 100%, 60°C Limited
Butylacetate @ 100%, 20°C Limited
Chlorinated solvents @ 20°C Limited
Chloroform @ 20°C Limited
Dioctylphtalate @ 100%, 100°C Limited
Ethanol @ 96%, 20°C Satisfying
Ethyleneglycol (Ethane diol) @ 100%, 20°C Satisfying
Ethyleneglycol (Ethane diol) @ 100%, 50°C Limited
Glycerol @ 100%, 20°C Satisfying
Grease @ 20°C Satisfying
Kerosene @ 20°C Satisfying
Methanol @ 100%, 20°C Limited
Methylethyl ketone @ 100%, 20°C Limited
Mineral oil @ 20°C Satisfying
Phenol @ 20°C Non Satisfactory
Silicone oil @ 20°C Satisfying
Soap @ 60°C Limited
Soap @ 20°C Limited
Sodium hydroxide @ 10%, 20°C Satisfying
Sodium hydroxide @ 10%, 60°C Non Satisfactory
Sodium hydroxide @ 10%, 90°C Non Satisfactory
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
Electrical
Arc Resistance, sec 75 - 125
Dielectric Constant 3 - 4 
Dielectric Strength, kV/mm 60
Dissipation Factor x 10-4 20 - 200 
Volume Resistivity x 1015, Ohm.cm 16
Mechanical
Elongation at Break, % 30 - 70
Elongation at Yield, % 3.8
Flexural Modulus, Gpa 2.8 - 3.5
Hardness Rockwell M 50 - 100 
Hardness Shore D 85 - 95 
Strength at Break (Tensile), MPa 45 - 70
Strength at Yield (Tensile), MPa 50 - 57 
Toughness, J/m 140
Young's Modulus, GPa 2.8 - 3.5
Optical
Gloss, % 105 - 200
Transparency, % 70 - 90
Physical
Density, g/cm3 1.3 - 1.4
Gamma Radiation Resistance Good
Glass Transition Temperature, °C 73 - 78
Shrinkage, % 0.2 - 3
Sterilization Resistance (Repeated) Poor
UV Light Resistance Fair
Water Absorption 24 hours, % 0.1 - 0.2
Service Temperature
Ductile / Brittle Transition Temperature, °C -40
HDT @0.46 Mpa (67 psi), °C 75 - 115
HDT @1.8 Mpa (264 psi), °C 65 - 80
Max Continuous Service Temperature, °C 80 - 140
Min Continuous Service Temperature, °C -40
Thermal
Coefficient of Linear Thermal Expansion x 10-5, /°C 6 - 8
Fire Resistance (LOI), % 23 - 25 
Flammability, UL94 HB
Thermal Insulation, W/m.K 0.29

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