Injection Molding of Polyethylene(PE)-Overview

What is Polyethylene Injection Molding?

Polyethylene (PE) is a commonly used plastic because it is lower in cost and has good chemical and impact resistance. PE injection molding can be performed by many different companies, but when it comes to choosing which one is best for your project, look no further than us! Here at Polytrex, we specialize in manufacturing parts from PE; we are able to perform injection molding services for industries that include automotive, aerospace, and construction.

Why is Polyethylene Used in Injection Moulding?

Polyethylene is one of the most widely-used plastics injection moulding. The high density and low cost of polyethylene make it ideal for applications where high strength, stiffness, and rigidity are required. However, injection moulding also allows manufacturers to produce complex geometries that cannot be achieved with other plastic processes, or with metal processing alone.

PE injection molding parts

Polyethylene Molding Process

The Polyethylene molding process is a semi-continuous method of producing parts with a high level of accuracy and repeatability. The process involves the injection of melted plastic into a steel mold, which has cavities that will form the parts. Once injected, the molten plastic fills the cavities and hardens. Once cooled, the pins are released and ejects the parts from their molds.

HDPE Injection Molding Grade

Our HDPE is normally available in either 300 or 500 grade. The higher the number, the higher the density, thus resulting in improved performance. In addition our HDPE sheet is available in a range of colors.

HDPE Injection Molding Temperature

When it comes to HDPE injection molding, the best results are obtained when the resin temperature is between 400 F and 430 F. If the temperature is too high, excessive flashing and burning can happen as well as shrink phenomena such as sink marks, warpage, shrinkage, and void formation


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