What is HDPE Molding?

Injection Molding Cost Calculator
Online Quotes in 30 Seconds
  • The world’s only 30-second injection molding quote
  • Parts shipped in as little as 15 days

Get your 30 second quote now

Used by 10,000 companies. Save 30-50% on molds.
By Jeremy Losek, Sep 14th, 2021

HDPE molding is the injection molding of parts using the material high-density polyethylene (HDPE). HDPE is a commonly used plastic because it is lower in cost and has good chemical and impact resistance. There are many applications for HDPE plastic across a variety of industries, from consumer products to industrial or commercial use.

What is HDPE?

High-density polyethylene (HDPE) or polyethylene high density (PEHD) is a thermoplastic polymer made from the polymerization of ethylene. It has a high strength-to-density ratio and is thus used in the production of many everyday products such as plastic bottles, food storage, piping, plastic lumber, and more. A product made from HDPE has the number “2” printed on it as it is a commonly recycled material. HDPE has a melt temperature between 356-536◦F and a molding temperature of 68-194◦F. FDA graded HDPE can be used for toy, food, and medical applications.

HDPE Injection Molding

HDPE can be molded to produce parts of varying shapes and sizes. The HDPE plastic is first melted into a moldable state. Once the HDPE has reached the ideal temperature inside the HDPE injection molding machine, it is transferred into the cavity of a mold with “A” and “B” parts. Once inside it begins to harden almost immediately. The part then cools to the shape of the mold. The “A” and “B” part of the mold eject the part once it has fully set. After this process has been completed, the mold resets to make another part. The process can repeat itself over and over again.

Using injection molding to produce HDPE parts has several benefits:

  1. Greater customization control: the HDPE mold is created to your unique project specifications.
  2. Lower cost: the automation and repeatability of injection molding reduces labor costs while increasing productivity.
  3. Efficiency: producing parts using injection molding is quicker than traditional molding methods and allows for thousands of parts to be produced from the same mold.
  4. Higher Volumes: The repeatability of the injection molding process allows for a higher volume of products to be produced at a rapid pace.

While injection molding has a higher up-front investment, the unit cost decreases the more parts that are produced over time. If your project requires a large volume of parts, injection molding is a manufacturing process to consider.

Popular HDPE Products

Some everyday products made from HDPE include rope, plastic mailing envelopes, pipes, chairs and stools, bottle crates, playground equipment, toys, plastic bags, water bottles, milk jugs, lotion bottles, storage sheds, parts for skeletal and facial reconstruction, Tyvek wrap for houses, food storage containers, and more. The use of HDPE is extremely popular in the USA and is so common many of us do not even realize we are using a product made using HDPE injection molding.

For your HDPE injection molding requirements, ICOMold has the expertise and team to meet your needs. We offer fast and dependable service, low prices, quick quotes, plus an online project management system. Your production injection mold includes a lifetime guarantee. Whether your project demands a low or high volume, we can work with you. Please feel contact us at (419) 867-3900 or email sales@icomold.com.

ICOMold is a Leader in Plastic
Injection Molding for US Companies

Manufacturing Locations Across National Time Zones
The Fathom Advanced Manufacturing Platform

1050 Walnut Ridge Drive
Hartland, WI 53029
ISO 9001:2015


444 W. 21st St. Ste. 101
Tempe, AZ 85282
ISO 9001:2015
NIST800-171 Compliant


7770 Washington St.
Denver, CO 80229
ISO 9001:2015


13758 Johnson Street NE
Ham Lake, MN 55304


1801 Rowe Lane
Pflugerville, TX 78660
ISO 9001:2015

1513 Sam Bass Rd
Round Rock, TX 78681
ISO 9001:2015
ISO 13485:2016


620 3rd Street
Oakland, CA 94607
ISO 9001:2015 Design Certified
NIST 800-171 Compliant


14000 N.W. 58th Court
Miami Lakes, FL 33014
ISO 9001:2015 Design Certified
ISO 13485:2016



1920 Slaterville Rd
Ithaca, NY 14850

401 W. Shore Blvd.
Newark, NY 14513
ISO 9001:2015


1207 Adams Drive
McHenry, IL 60051
ISO 9001:2015

1401 Brummel Ave
Elk Grove, IL 60007
ISO 9001:2015 Design Certified