Polyethylene Injection Molding

We specialize in Polyethylene PE injection molding, delivering lightweight, impact-resistant, and flexible parts with excellent chemical resistance.

Erye Offer Polyethylene Injection Molding Service Specific to Your Needs!

Polyethylene injection molding is ideal for producing flexible, lightweight, and impact-resistant parts. With excellent chemical resistance and processability, PE is commonly used for applications requiring durability and elasticity. However, its low rigidity and tendency to shrink require precise molding techniques to ensure dimensional stability and performance.

Polyethylene Injection Molding Services

Service	Details
Maximum Part Size	2500mm x 2000mm (98 in. x 78 in.)
Recommended Wall Thickness	1.2mm - 3.5mm (0.0472 in. x 0.1378 in.)
Color Options	Any color according to RAL or Pantone Code
Standard Finishes	SPI and VDI
Mold Ownership	Customer owned with mold maintenance
Mold Life	Unlimited (If the Polyethylene mold worn out, Erye will cover the cost of new mold)

Polyethylene Injection Molding Design Guide

PE’s flexibility, low stiffness, and high shrinkage require special design considerations to ensure structural integrity and manufacturability.

Item	Description
Wall Thickness	Maintain a uniform wall thickness between 0.8 – 3.0 mm to prevent warping and ensure even cooling.
Rib and Boss Design	Use ribs at 40-60% of the main wall thickness to reinforce the structure without introducing sink marks.
Draft Angles	Apply a draft angle of 1.5° – 3° to prevent sticking and facilitate ejection from the mold.
Shrinkage Compensation	Account for PE’s high shrinkage rate of 1.5 – 3.5%, adjusting dimensions accordingly.
Corner Radius	Avoid sharp corners by using a minimum fillet radius of 0.5 times the wall thickness to reduce stress concentration.

ABS Plastic Molding Design Guidelines

Following are the key design elements that impact both the manufacturing process and the performance of the final ABS molded product.

Item	Description
Wall Thickness	Recommended Thickness: 2-4 mm (0.08-0.16 inches). Use ribs to strengthen thin walls, keeping their thickness 50-60% of the main wall.
Draft Angles	To ensure smooth ejection from the mold, parts should have a draft angle 1-2° for most features. For textured surfaces, increase to 3-5°.
Radii and Corner	Avoid sharp corners to reduce stress concentrations, use a minimum radius of 0.5-1 mm (0.02-0.04 inches) for corners.
Shrinkage	ABS typically shrinks 0.4-0.7% during cooling, account for shrinkage in part dimensions and mold design.
Undercut	Design parts to minimize undercuts, use side actions, lifters, or collapsible cores if undercuts are unavoidable.
Surface Finish	ABS can be molded with various surface finishes, from glossy to matte, it also can be painted, chromed, or textured for enhanced aesthetics.

Start Polyethylene Molding Project

Get high-quality PE injection molded parts! Contact with Erye molding to request a quote!

Advantages of Polyethylene Injection

Superior Flexibility & Softness

PE is highly elastic and does not break easily under stress, making it ideal for squeeze bottles, snap-fit lids, and living hinges that require repeated bending without cracking.

Low-Temperature Toughness

Unlike many plastics, PE retains its impact strength even at sub-zero temperatures, making it suitable for freezer applications and outdoor products exposed to cold environments.

Non-Toxic & FDA-Approved Options

Many PE grades are safe for direct food and beverage contact, making them ideal for food containers, baby products, and pharmaceutical packaging.

High Processability & Flowability

PE's low viscosity allows it to fill molds efficiently, producing complex shapes with thin walls and intricate details while minimizing defects like warping.

Disadvantages of Polyethylene Injection

Low Rigidity

Compared with many engineering plastics, PE is more flexible and may deform under load if structural strength is required.

Poor Scratch Resistance

The surface is relatively soft, making molded parts more prone to scratches and visible wear during use.

Difficult to Bond or Paint

PE has very low surface energy, which makes adhesive bonding, printing, or painting difficult without special surface treatment.

High Shrinkage

PE tends to shrink more during cooling, which can lead to dimensional variation and may require careful mold design and process control.

Injection Molded Polyethylene Application

Industrial & Automotive

Cable insulation covers
Protective end caps
Flexible automotive seals

Packaging & Consumer Goods

Squeeze bottles
Caps and lids
Flexible food containers
Cosmetic packaging

Medical & Healthcare

Dropper bottles
Tubing connectors
Medical squeeze tubes

Agriculture Equipment

Drip irrigation components
Soft tool grips
Weather-resistant covers

Additonal Options for Polyethylene Parts

Case Study

From Idea to Production: Vacuum Cleaner Mold Case Study

How we guide brand owners through mold design and manufacturing? This case shows how we worked side-by-side with the client to build the mold that brought their vacuum cleaner to market.