HDPE vs. PET

Both HDPE and PET are thermoplastics. There are 10 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is HDPE and the bottom bar is PET.

High Density Polyethylene (HDPE)Polyethylene Terephthalate (PET, PETE)

Metric UnitsUS Customary Units

Material Properties

Density, g/cm³		1.0 to 1.3
Density, g/cm³		1.4 to 1.6

Elongation at Break, %		2.5 to 100
Elongation at Break, %		2.5 to 70

Flexural Modulus, GPa		4.0 to 7.5
Flexural Modulus, GPa		8.3 to 14

Impact Strength: Notched Izod, J/m		50 to 260
Impact Strength: Notched Izod, J/m		43 to 85

Maximum Temperature: Mechanical, °C		90
Maximum Temperature: Mechanical, °C		80

Specific Heat Capacity, J/kg-K		1330 to 2400
Specific Heat Capacity, J/kg-K		1000 to 1150

Strength to Weight: Axial, points		6.9 to 17
Strength to Weight: Axial, points		12 to 27

Strength to Weight: Bending, points		19 to 32
Strength to Weight: Bending, points		25 to 41

Tensile Strength: Ultimate (UTS), MPa		24 to 80
Tensile Strength: Ultimate (UTS), MPa		60 to 140

Water Absorption At Saturation, %		0.1 to 0.3
Water Absorption At Saturation, %		0.24 to 0.5

HDPE vs. PET

Material Properties

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