PE

Injection Molding | Lightweight, impact strength, weather resistance

injection molding slide view image - pe 3

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.

Properties	Metric	Other
Density	1.01 – 1.20 g/cc	0.0365 – 0.0434 lb/in³
Hardness	68 – 113	68 – 113
Tensile Strength (Yield)	13.0 – 65.0 MPa	1890 – 9430 psi
Tensile Strength (Ultimate)	22.1 – 49.0 MPa	3210 – 7110 psi
Elongation at Yield	0.62 – 30 %	0.62 – 30 %
Elongation at Break	3.0 – 150 %	3.0 – 150 %
Dielectric Strength	18.0 – 50.0 kV/mm	457 – 1270 kV/in
Melt Temperature	180 – 274 °C	356 – 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.

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.