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Introduction

Polyethylene (PE) is a thermoplastic available as high-density polyethylene or low-density polyethylene. High-density polyethylene, referred to as HDPE, is mainly used in blow molding and has high temperature resistance, oil resistance, steam permeability and environmental stress cracking resistance. PE also offers good electrical insulation, impact resistance and temperature resistance.

Applications: Consumer goods, toys, food containers and closures, automotive parts.

Behavior: To avoid deformation, mold temperature should be controlled to keep the cooling uniform and stable. HDPE has a high crystallization ability, and the temperature of the mold has an impact on the crystallization of the plastic part.

PropertiesMetricOther
Density1.01 – 1.20 g/cc0.0365 – 0.0434 lb/in³
Hardness68 – 11368 – 113
Tensile Strength (Yield)13.0 – 65.0 MPa1890 – 9430 psi
Tensile Strength (Ultimate)22.1 – 49.0 MPa3210 – 7110 psi
Elongation at Yield0.62 – 30 %0.62 – 30 %
Elongation at Break3.0 – 150 %3.0 – 150 %
Dielectric Strength18.0 – 50.0 kV/mm457 – 1270 kV/in
Melt Temperature180 – 274 °C356 – 525 °F

Surface Finish

Painting

Painting the surface of a part improves its aesthetic appearance and can provide brand recognition to consumers. In addition, painting can have a protective effect on parts.

Painting Image
Screen Printing

Screen printing is a printing technique where a mesh is used to transfer ink onto a substrate, except in areas made impermeable to the ink by a blocking stencil.

Screen Printing Image

Design Guideline

Wall Thickness

Between 1 mm and 3 mm

Keeping walls as thin and constant as possible will reduce warping and sinking

Thickness gradient

Wall thickness should increase by no more than three times

Transition between thicknesses can be made smoother with fillets

Internal edges

Rounded, more than half wall thickness

Add fillet with largest possible radius

External edges

Rounded, full wall thickness plus internal fillet

Add fillet with largest possible radius

Draft angle

Increase draft by 1° for every 25 mm (for parts taller than 50 mm)

Add draft to ease ejection and avoid drag marks

Textured finish

Increase draft angle by 1-2°

Increase draft to ease ejection and avoid drag marks

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