- 9 leading manufacturers
- 131 additional suppliers
- 39 states and provinces
- 17 related categories
- 4 guide sections
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, 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.
Suppliers located in OH, IL, CA +36 more states
Contents (4 sections)
Leading Insert Molding Manufacturers
Showing all 9
Certification, declaration and ownership records are on file for 1 of 9 suppliers in this list, from supplier reports IQS reviewed. A supplier without one listed may still hold it.
| Placement No. | Manufacturer | Location | Contact | Actions | |
|---|---|---|---|---|---|
| 1 | LTM PlasticsLTM 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. | Denver, CO | |||
| 2 | Progressive Molding Technologies Inc.At Progressive Molding Technologies, we specialize in precision injection molded plastics engineered to meet demanding performance and quality standards. Our company works closely with customers to transform design concepts into durable, production-ready components used across a wide range of industries. | Medina, OH | |||
| 3 | Hi-Rel Plastics & MoldingHi-Rel Plastics is a U.S. custom plastic injection molding company specializing in precision injection molded parts for medical, aerospace, automotive, electronics, industrial, and consumer markets. We provide prototype through high-volume production, engineering-grade resins, insert molding, overmolding, tight-tolerance molding, tooling, assembly, and secondary operations with ISO-certified quality, competitive pricing, fast lead times, and reliable U.S. manufacturing.
Hi-Rel Plastics & Molding states: EU RoHS (Supplier-reported, reviewed Sep 2026), EU REACH (Supplier-reported, reviewed Sep 2026), Small Disadvantaged Business (Supplier-reported, reviewed Sep 2026), Minority-owned business (Supplier-reported, reviewed Sep 2026) | Riverside, CA | |||
| 4 | Quality Plastics, LLCAt Quality Plastics, LLC, we pride ourselves on being at the forefront of the injection molded plastics industry. Our expertise lies in crafting high-quality plastic components and products designed to meet the most demanding specifications and applications. We embrace a comprehensive approach to manufacturing, ensuring that each product we produce meets rigorous standards for precision and durability. | Fredericksburg, OH | |||
| 5 | TMF Plastic SolutionsAt TMF Plastic Solutions, precision and quality define our approach to injection molding. Advanced manufacturing capabilities and a deep understanding of material properties allow us to produce durable, high-performance plastic components for a variety of industries. | Plano, IL | |||
| 6 | PharoPLASTPharoPLAST is an engineering-led custom injection molder in Cleveland, Ohio that helps Midwest OEMs get new products to market faster and bring today’s production under tighter control. With faster lead times, lower startup costs, hands-on engineering support, and seamless communication, your plastic part supplier can finally become your plastic part partner. | Cleveland, OH | |||
| 7 | EXI-plast Custom Moulding Ltd.At EXI-plast Custom Moulding Ltd., we specialize in delivering high-quality injection molding solutions tailored to our client's diverse needs. With years of experience and advanced manufacturing capabilities, we excel in producing precision-molded components for various industries. Partner with us for reliable and customized injection molding solutions. | Centralia, ON | |||
| 8 | Zauderer Associates, Inc.At Zauderer Associates, Inc., we specialize in providing high-quality injection molding solutions tailored to meet the diverse requirements of our clients. Our team leverages extensive experience and advanced technology to produce precision-molded components that consistently exceed expectations. | Rockmart, GA | |||
| 9 | GSH Industries, Inc.You won’t find better quality injection molded plastics anywhere else in the industry. We have built ourselves up from a small manufacturing company to a large company with decades of experience. We can provide effective, efficient, and affordable solutions that will help you meet your goals and get the job done right. Contact us to learn more today! | Strongsville, OH |
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Leading insert molding manufacturers are listed first on this page, each with a website preview and a Request a Quote button on its row.
Additional Insert Molding Companies
The category’s other insert molding companies are listed on their own page, with location, phone and website where each supplier provides them.
View 131 Additional Insert Molding CompaniesDo not see your company listed in Insert Molding?
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Quick Answers
- How many insert molding manufacturers are listed on IQS Directory?
- 9 leading manufacturers and 131 additional suppliers.
- Where are insert molding manufacturers located?
- The listed suppliers are in 39 states and provinces: Ohio (17), Illinois (16), California (14), Michigan (10), Indiana (7), New York (7), Texas (7), Wisconsin (7), and 31 more.
- How do I get quotes from insert molding suppliers?
- Select suppliers in the table and choose Request Quotes. IQS reviews your request and forwards it to every supplier you select.
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.
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.