What is HDPE Molding?

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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.

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