The plastic manufacturing industry in Illinois is a bustling sector that is home to a wide variety of companies. These companies specialize in the production and supply of plastic and die cast products, often delivering high precision tooling support, injection molding, and a range of secondary operations. Disk drives, automotive parts, and complex part assemblies are some of the solutions these firms offer to businesses and consumers. There's evidence to suggest that new technologies and sustainable materials are shaping the future of the industry as companies attempt to minimize their environmental impact.


Top 19 plastic manufacturing companies in Illinois

1. KI Industries, Inc.

KI Industries is a leading manufacturer of decorative plastic and die cast components, and complex part assemblies for the automotive industry. They offer high-quality products that are consistently delivered on time, ensuring a reliable supply chain for their customers.


2. Dinesol Plastics Inc.

  • Website: dinesol.com
  • Headquarters: Niles, Illinois, United States
  • Founded: 1937
  • Headcount: 501-1000
  • LinkedIn

Dinesol is a plastics manufacturing company that offers high precision global tooling support. They provide dependable production ready tools at competitive prices and deliver them on time.


3. Wise Plastics Technologies

Wise Plastics is a full-service custom plastic injection molding company located in St. Charles, IL. They offer value engineering and manufacturing excellence in producing high-quality custom injection molded components. With state-of-the-art facilities and advanced technology systems, Wise Plastics delivers quality-critical parts on time and at competitive prices. They also provide a range of in-house secondary operations and offer contract manufacturing services.


4. InserTecH

Insertech.net is a company specializing in insert molding and injection molding. With facilities in Cary, Illinois, Culiacan, Mexico, and Suzhou, China, they offer engineering solutions to customers' problems. Their expertise includes two-shot molding, in-mold circuit definition, and advanced encapsulation technology. They are ISO/TS certified and provide production systems, tooling, and product experience in plastic, metal stampings, and encapsulation. Contact InserTech to learn more about their services.


5. Hoffer Plastics

Hoffer Plastics is a family-owned and operated company that specializes in custom plastic injection molding. With over 60 years of experience, they offer high-quality products and exceptional customer service. They are known for their on-time delivery and have shipped billions of parts annually. Hoffer Plastics is committed to sustainability and is recognized for their environmentally-friendly practices.


6. Custom Plastics Inc.

Custom Plastics, Inc. is a leading plastic extrusion and injection molding company in the Midwest. With over 60 years of experience, they specialize in providing innovative plastic injection molding, extrusion, and engineering solutions. Their commitment to customer service, quality control, and timely delivery sets them apart. They offer value-added finishing services, reducing production costs and enhancing end products. They cater to various industries and partner with OEMs worldwide. Their ISO 9001 Quality System ensures repeatability and continuous improvement.


7. Hansen Plastics Corporation

Hansen Plastics is a custom plastic injection molding company based in Elgin, Illinois. With over 70 molding presses and a multi-faceted value stream mapping process, they offer manufacturing and design solutions for a variety of industries. As a 100% employee-owned company, their team is dedicated to delivering high-quality products and services to ensure customer satisfaction and drive profitable growth.


8. CCK Automations, Inc.

CCK Automations, Inc. is a manufacturer of printed circuit board assemblies, injection molded plastics, wire and cable assemblies, and industrial control panels. We offer full electronic and plastic design services, mold design and manufacturing, and a broad range of capabilities from concept to finished product. Our goal is to be a leader in manufacturing innovative and high-quality products.


9. Prismier, LLC

  • Website: prismier.com
  • Headquarters: Bolingbrook, Illinois, United States
  • Founded: 2004
  • Headcount: 51-200
  • LinkedIn

Prismier is a global manufacturing company based in Chicago, Illinois, offering comprehensive solutions for custom metal and plastic parts. They prioritize speed and efficiency, delivering fast and simple manufacturing processes to meet high-quality standards. Their services include CNC machining, sheet metal fabrication, rapid prototyping, injection molding, and more. Prismier is trusted by market leaders across industries to take their parts from prototype to production.


10. Armin Tool & Manufacturing Co.

  • Website: armin-ind.com
  • Headquarters: S. Elgin, Illinois, United States
  • Founded: 1952
  • Headcount: 51-200
  • LinkedIn

Armin Tool and manufacturing company, Inc. specializes in plastic injection molds for tight-tolerance, high-volume parts in the caps and closures, medical, and packaging industries. They are your long-term mold building partner, offering design for manufacturability and production mold sampling.


11. Tri-Par Die and Mold Corporation

  • Website: tri-par.com
  • Headquarters: South Elgin, Illinois, United States
  • Founded: 1960
  • Headcount: 51-200
  • LinkedIn

Tri-Par Corporation is a contract manufacturing company specializing in precision injection molding and tooling. With over 60 years of experience, we provide high-quality products and services to industries such as automotive, medical, electronic, water purification, and consumer products.


12. Chicago Mold Engineering Co., Inc.

Chicago Mold Engineering Company, Inc. is a leading provider of plastic injection and compression molds for the Thermoset and Thermoplastic industries. They offer a wide range of services including mold design, engineering, manufacturing, repair, and rebuild. With state-of-the-art technology and experienced staff, they ensure top-quality mold designs and production models. Their expertise also extends to specialized machining and gun drilling services.


13. A1 Tool Corp

  • Website: a1toolcorp.com
  • Headquarters: Melrose Park, Illinois, United States
  • Founded: 1946
  • Headcount: 51-200
  • LinkedIn

A1 Tool Corporation is a trusted company specializing in the design and manufacturing of plastic injection molds. With over 70 years of experience, they offer a wide range of services including stack molds, tandem molds, multi-shot molds, and conventional injection molds. They pride themselves on their expertise, quality, and quick turnaround time.


14. All-Rite Industries

All-Rite Industries is a manufacturing company specializing in custom plastic injection molding, metal stamping, wire forming, and assembly services. With a focus on delivering high-quality products at competitive prices and on-time delivery, they offer a wide range of services to meet the needs of various industries.


15. Ex-Tech

  • Website: extechplastics.com
  • Headquarters: Richmond, Illinois, United States
  • Founded: 1983
  • Headcount: 51-200
  • Latest funding type: Acquired
  • LinkedIn

Extech Plastics is a company that offers high-quality plastic injection molding solutions. They specialize in providing custom molding services, prototyping, and product development. With their state-of-the-art facilities and expertise, they cater to various industries, such as automotive, electronics, and consumer goods.


16. Pyramid Molding Group

Pyramid Molding Group is a company that specializes in plastic injection molding and mold manufacturing. They offer a full range of services, including proof of concept, design engineering, and mold-building. Their team is dedicated to providing high-quality, complex components for various industries.


17. Van Norman Molding

Van Norman Molding is a trusted name in the thermoset and thermoplastic injection molding industry. With a focus on innovation, quality, and customer satisfaction, they deliver high-performing plastic components for various industries. Specializing in medium to high-volume production runs, they offer a range of services including part design optimization, material selection, and robust mold design. Their state-of-the-art molding techniques and expertise ensure consistent and structurally sound plastic parts.


18. Creative Die Mold

  • Website: creativediemold.com
  • Headquarters: Glendale Heights, Illinois, United States
  • Founded: 1978
  • Headcount: 51-200

Creative Die Mold Corp. is a premier plastic injection mold fabricator and repair shop located in Chicago. Their team of skilled professionals provides top-quality engineering and machining services for customers nationwide.


19. ShapeMaster, Inc.

Shape Master is a company specializing in plastic thermoforming, injection molding, and vacuum forming. We offer high-quality manufacturing services for various industries.


Want to find more plastic manufacturing companies?


If you want to find more companies that provide a range of high-precision, quality-critical plastic products you can do so with Inven. This list was built with Inven and there are hundreds of companies like these globally.


With Inven you'll also get to know the company's:


  • Ownership: Which of these are private equity backed? Which are family-owned?
  • Contact data: Who are the owners and CEO's? What are their emails and phone numbers?
  • Financials: How do these companies perform financially? What are their revenues and profit margins?

...and a lot more!