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Insert Molding Manufacturers and Companies

IQS Directory provides useful search tools to find leading insert molding companies and suppliers. Utilize our website to review and source insert molding companies with our easy-to-use features which allow you to locate insert molding companies that will design, engineer, and provide insert molding for your exact specifications. Our request for quote forms make it easy to connect with leading insert molding companies. View company profiles, website links, locations, phone number, product videos, customer reviews, product specific news articles and other production information. We are a leading manufacturer directory who will connect you with the right manufacturers whether you are looking for vinyl insert trim molding, double-shot molding, or auto insert molding.

Leading Companies:

  • Denver, CO 303-592-9548

    LTM Plastics is Denver's premium injection molder, serving up quality since 1977. At LTM, you can expect consistent results, transparency and meaningful collaboration. We talk with our customers to determine their needs and then build our processes to deliver the highest quality parts quickly. We have experience but we’re not beholden to the “old ways” of doing things. It’s all about finding the right solution for the situation. Call today and see if we're the right partner for your next project.

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  • Shelby Township, MI 248-275-1978

    Located in Shelby Township, MI, MSI Mold has over 30 years of experience in the injection molding business. Our state-of-the-art equipment enables us to make intricately designed products to suit a variety of industries. We believe in drama-free and delay-free customer service. Get in touch with us today, and let us make your next product!

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  • Cleveland, OH 440-238-3009

    GSH Industries’ 25 years experience in insert moldings coupled with its state-of-the-art manufacturing facility can provide you with industry leading service. For all inquiries and quotes, visit our website or contact us today for superior personal service from our trained and experienced staff.

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  • Stuart, FL 772-286-9278

    Insert molding is what we do, and we do it well. For nearly 30 years, we have continued to offer nothing but the best in injection plastic molding. We believe in offering the best to customers, including technology, equipment, service, and prices. Find out more by visiting us online or giving us a call today!

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  • Riverside, CA 951-354-0258

    Hi-Rel Plastics & Molding, Inc. offers custom insert molding for a variety of industries. With more than 35 years of experience, our quality products are unparalleled. We process an almost infinite variety of thermoplastic resins, our prices are competitive, and our delivery is on time. Value-added services include label application, assembly services, and custom packaging and shipping services. We are ISO 9001:2015, AS 9100 Rev D, 13485:2016 Certified.

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  • Tempe, AZ 951-509-6918

    Call Molded Devices for a fast, competitive quote on plastic molding, plastic injection molding, and medical injection molding services. A wide range of standard & proprietary caps, covers & containers plus custom components for all your needs. We are your one-stop for design consult, quick prototyping, custom formulations & secondary operations!

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  • Mesa, AZ 818-486-1522

    ZETWERK provides high-quality injection molded plastics with precise configuration of all shapes and geometrics. Our products have a range of .4gms to 2kgs for part size and 15T to 1250T for press size. ZETWERK is ISO 9001:2015 and AS9100D certified. Our Injection molding plants are IATF 16949:2016 and ISO 13485:2016 certified.

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  • More Insert Molding Companies

Insert Molding Industry Information

Insert Molding

Insert molding is a plastic injection molding process in which an insert, such as an object or component, is placed into the mold cavity and then injected with molten plastic that is thus molded around the insert. Insert molding is a more effective alternative to the assembly of discrete parts by means of soldering, adhesives, or fasteners.

Quick links to Insert Molding Information

Applications of Insert Molding

Insert molding serves many industries, such as:

  • Electronics
  • Medical
  • Military
  • Industrial
  • Automotive
  • Aerospace
  • Food Processing
  • Commercial
  • Residential
  • Cosmetic
  • Construction

Typical insert injection molding applications include:

  • Cable Embedded Electronics
  • Medical Devices
  • Printers
  • Thermostats
  • Aerosol Nozzles
  • Electrical Plugs
  • Screwdrivers
  • Needle Hubs
  • Bifurcations
  • Threaded Fasteners

Materials Commonly Used in Insert Molding

Materials used during the insert molding process includes polystyrene, polyvinyl chloride, polyethylene, polypropylene, thermoplastic elastomers, and many more engineering plastics.

Process of Insert Molding

Insert molding is done through an injection molding machine. On the top of the machine is a hopper, through which the plastic granules enter the barrel of the machine. In the barrel, the plastic granules are heated until they become molten plastic. A reciprocating screw inside of the barrel carries the plastic granules into the mold cavity by way of a nozzle. The nozzle leads directly into the mold cavity. The mold is attached to a moveable platen so that it can push into and pull back from the mold cavity. An insert, which can be metal or plastic, is placed into the mold cavity just before molding. The molten plastic is then injected into the cavity through the nozzle and molds around the insert piece. Once the plastic has cooled, the mold is opened and the newly joined components are removed.

Two types of bonding occur during insert molding: mechanical and molecular. Molecular bonding takes place by either shrinking the encapsulating plastic resin around the insert as it cools or surrounding the irregularities on the insert’s surface by the plastic resin. Mechanical bonding, however, only takes place when the insert’s material is the same as or very similar to the plastic resin.

Here are the three types of insert molding:

Low Volume
100-1000 parts that the operator inserts all at once.
Medium Volume
1000-10,000 parts that the operator loads in multiples and is aided by a loading device.
High Volume
100,000 parts or more that are loaded automatically.

Benefits of Insert Molding

Some benefits of plastic insert molding include:

Low Costs
Since multiple tasks are being done at once both labor and assembly time is saved.
Greater Durability
As the plastic resins mold to the insert more securely than other joining methods.
Lighter Components
Since plastic resin weighs less than metal connectors.


More Insert Molding Information

Insert Molding Informational Video