HDPE High Density Polypropylene Material Properties

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High Density Polyethylene – HDPE

High Density Polyethylene (HDPE) Representing the largest portion of the polyethylene applications, HDPE offers excellent impact resistance, light weight, low moisture absorption, and high tensile strength. HDPE is also non-toxic and non-staining and meets FDA and USDA certification for food processing.

Polymer Type

Thermoplastic

Advantages

Good low temperature impact resistance. Excellent chemical resistance.

Disadvantages

Susceptible to stress cracking.  Has lower stiffness compared to Polypropylene.  High mould shrinkage and poor UV resistance.

High Density Polyethylene (HDPE)

Representing the largest portion of the polyethylene applications, HDPE offers excellent impact resistance, light weight, low moisture absorption, and high tensile strength. HDPE is also non-toxic and non-staining and meets FDA and USDA certification for food processing.

GENERAL DESCRIPTION

Polyethylenes are semi-crystalline materials with excellent chemical resistance, good fatigue and wear resistance, and a wide range of properties (due to differences in length of the polymer chain.) Polyethylenes are easy to distinguish from other plastics because they float in water.

GENERAL PROPERTIES OF POLYETHYLENES

Polyethylenes provide good resistance to organic solvents, degreasing agents and electrolytic attack. They have a higher impact strength, but lower working temperatures and tensile strengths than polypropylene. They are light in weight, resistant to staining, and have low moisture absorption rates.

TYPICAL PROPERTIES of POLYETHYLENE

Property

Value

Density (g/cm3)

0.96

Surface Hardness

SD68

Tensile Strength (MPa)

32

Flexural Modulus (GPa)

1.25

Notched Izod (kJ/m)

0.15

Linear Expansion  (/°C x 10-5)

12

Elongation at Break (%)

150

Strain at Yield (%)

15

Max. Operating Temp. (°C)

55

Water Absorption (%)

0.02

Oxygen Index (%)

17

Flammability UL94

HB

Volume Resistivity (log ohm.cm)

17

Dielectric Strength (MV/m)

22

Dissipation Factor 1kHz

0.0005

Dielectric Constant  1kHz

2.3

HDT @ 0.45 MPa (°C)

75

HDT @ 1.80 MPa (°C)

46

Material. Drying  hrs @ (°C)

NA

Melting Temp. Range (°C)

220 - 310

Mould Shrinkage (%)

3

Mould Temp. Range (°C)

30 -  70

NOTE: The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers' complete material property datasheets.
All values at 73°F (23°C) unless otherwise noted.



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