Plastic manufacturing in Illinois forms a vital sector within the U.S. economy, driving innovation and providing essential materials for industries like automotive, healthcare, and consumer goods. This industry is marked by companies specializing in a range of processes, including injection molding, extrusion, and custom manufacturing. As sustainability becomes a focus, many firms are researching recycled materials and bio-based plastics. This emphasis on eco-friendly practices marks a pivotal shift as the market strategizes to align with consumer trends. Ongoing technological advancements continue to refine production techniques, contributing to efficiency and quality in plastic applications.


The plastic manufacturing companies in Illinois feature a mix of family-owned, private, and corporate entities. These firms range from small operations with less than 50 employees to larger organizations employing thousands. Established over several decades—some as early as the 1920s—this array of companies specializes in various industry applications, including automotive parts, consumer products, and medical supplies. Many of them present innovative approaches, with some focusing on resins and plastic compounds while others concentrate on custom molding solutions. Their geographical distribution across Illinois highlights the regional strength of the industry.


Continue reading to discover the top plastic manufacturing companies in Illinois.


Top 19 Plastic Manufacturing Companies in Illinois


1. Custom Plastics, Inc.

  • Website: customplasticsinc.com
  • Ownership type: Private
  • Headquarters: Elk Grove, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1955
  • Headcount: 51-200
  • LinkedIn: custom-plastics

Custom Plastics, Inc. is a privately-owned manufacturing company based in Elk Grove Village, Illinois, specializing in plastic extrusion and injection molding. Established in 1955, the company has built a strong foundation in the industry, providing a range of services that include design, prototyping, assembly, and quality assurance. They cater primarily to Original Equipment Manufacturers (OEMs) across multiple sectors, ensuring that their plastic components meet high standards of quality and performance. Custom Plastics operates with a commitment to customer satisfaction, which is reflected in their impressive metrics: they have delivered over 91 million parts since 2018 and maintain a remarkable on-time delivery rate of more than 98%. The company has also expanded its capabilities over the years, operating 20 extruders and continuously investing in advanced equipment and processes. Their focus on quality is further emphasized by their ISO-compliant quality management system, which ensures that every product meets stringent quality criteria before shipment. Custom Plastics also offers value-added services, streamlining the production process for their clients and enhancing the overall efficiency of their operations.


2. M. Holland Company

  • Website: mholland.com
  • Ownership type: Corporate
  • Headquarters: Northbrook, Illinois, United States (USA)
  • Employee distribution: United States (USA) 88%, Mexico 8%, Other 4%
  • Latest funding: August 2023
  • Founded year: 1950
  • Headcount: 201-500
  • LinkedIn: m--holland-company

M. Holland Company, established in 1950 and based in Northbrook, Illinois, operates as a prominent distributor of plastic resins. The company specializes in providing sourcing and logistics solutions tailored to various industries, including automotive, healthcare, and packaging. With a workforce of approximately 302 employees, M. Holland emphasizes building strong partnerships with both clients and suppliers. They offer technical support and market insights to help clients optimize their operations. Their commitment to sustainability is evident in their initiatives aimed at reducing waste and promoting responsible use of plastics. M. Holland has a network of distribution centers that streamline the delivery of thermoplastic resins, ensuring that clients receive timely and efficient service. The company has not reported any recent funding, indicating stability in its operations and a focus on organic growth.


3. Dinesol Plastics Inc.

  • Website: dinesol.com
  • Ownership type: Family Owned
  • Headquarters: Niles, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1937
  • Headcount: 501-1000
  • LinkedIn: dinesol-plastics-inc-

Dinesol Plastics Inc., based in Niles, Illinois, has been a significant player in the plastic manufacturing sector since its inception in 1937. Specializing in injection molding solutions, the company provides a comprehensive suite of services that includes product design, tooling, manufacturing, and logistics. Dinesol serves a variety of industries, notably automotive and healthcare, showcasing its ability to adapt to different market needs. With a manufacturing footprint of nearly 500,000 square feet, Dinesol operates 50 injection molding machines, ranging from 17 to 3,000 tons, which allows for high-volume production. The company prides itself on its commitment to quality, as evidenced by its ISO 9001:2015 certification. Dinesol's team of engineers and specialists work closely with clients to develop innovative and cost-effective solutions tailored to specific applications. Their focus on automation and advanced manufacturing techniques positions them as a competitive force in the plastic industry.


4. Advanced Plastics, Inc

  • Website: apinow.com
  • Ownership type: Private
  • Headquarters: Lake Zurich, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1994
  • Headcount: 11-50
  • LinkedIn: advancedplasticsinc

Advanced Plastics, Inc. (API), founded in 1994 and based in Lake Zurich, Illinois, is a private company that specializes in the import and distribution of plastic resins. With a workforce of approximately 25 employees, API has established itself as a reliable source for businesses across multiple industries, including automotive, aerospace, and consumer goods. The company offers a broad selection of materials, such as POM, PC, ABS, Nylon, and TPE, catering to the specific needs of its clients. API operates nine strategically located warehouses throughout the United States, which enhances their ability to deliver products efficiently and cost-effectively. Their focus on customer service and the ability to handle orders of varying sizes make them a valuable partner in the plastic manufacturing sector. API is dedicated to helping clients find the right materials to maintain their competitive edge in the market.


5. MRC Polymers Inc

  • Website: mrcpolymers.com
  • Ownership type: Private
  • Headquarters: Romeoville, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1980
  • Headcount: 51-200
  • LinkedIn: mrc-polymers-inc

MRC Polymers Inc, based in Romeoville, Illinois, is a private resin manufacturer that has been active since 1980. With a workforce of approximately 32 employees, the company specializes in engineered resins tailored for automotive applications. MRC Polymers provides high-quality products that assist automotive manufacturers and suppliers in producing durable parts, thereby helping them maintain a competitive edge in the market. Their product range includes various engineered resins such as MAXNITE PBT and NAXALOY PC/ABS, which are utilized in demanding interior and exterior automotive applications. MRC Polymers prides itself on its core values of integrity, value, and family, which guide its operations and relationships with customers and suppliers. The company has established a reputation for delivering cost-effective polymers that meet the rigorous demands of the automotive industry.


6. Hansen Plastics Corporation

  • Website: hansenplastics.com
  • Ownership type: Private
  • Headquarters: Elgin, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1971
  • Headcount: 51-200
  • LinkedIn: hansen-plastics

Hansen Plastics Corporation, based in Elgin, Illinois, has been a significant player in the plastic manufacturing industry since its inception in 1971. Specializing in custom plastic injection molding, the company caters to a variety of sectors, including automotive, appliances, life safety, fluid movement, transportation, construction, and agriculture. With over 70 molding presses and a commitment to quality, Hansen Plastics emphasizes precision and customer satisfaction in its operations. The company is 100% employee-owned, which instills a sense of ownership and responsibility among its workforce, driving them to deliver high-quality products and services. Their engineering and design capabilities, coupled with a focus on lean manufacturing, position them as a reliable partner for clients seeking tailored plastic solutions. Hansen Plastics is also ISO 9001:2015 certified, ensuring adherence to rigorous quality management standards.


7. MacLean-Fogg Company

  • Website: macleanfogg.com
  • Ownership type: Corporate
  • Headquarters: Mundelein, Illinois, United States (USA)
  • Employee distribution: United States (USA) 98%, Other 2%
  • Latest funding: October 2022
  • Founded year: 1925
  • Headcount: 1001-5000
  • LinkedIn: maclean-fogg-company

MacLean-Fogg Company, founded in 1925 and based in Mundelein, Illinois, is a family-owned manufacturing enterprise that specializes in fasteners, engineered solutions, plastics, and additive manufacturing. With a workforce of approximately 899 employees, the company serves various industries, including automotive and utilities, by providing high-quality components tailored to customer needs. MacLean-Fogg operates multiple facilities across North America and Europe, emphasizing innovation and quality in its production processes. The company has made significant strides in the plastic manufacturing sector, particularly through its Engineered Plastics Company division, which was formed by merging its Polymer Technologies Division with Engineered Plastics Corporation. This strategic move highlights their commitment to advancing plastic solutions and meeting the evolving demands of their clients.


8. Hoffer Plastics

  • Website: hofferplastics.com
  • Ownership type: Corporate
  • Headquarters: South Elgin, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: October 2000
  • Founded year: 1953
  • Headcount: 201-500
  • LinkedIn: hoffer-plastics

Hoffer Plastics, based in South Elgin, Illinois, is a family-owned plastic manufacturer that has been operational since 1953. The company specializes in custom injection molding, producing a wide array of plastic components tailored to the needs of various industries, including automotive, medical, and consumer goods. With a workforce of approximately 152 employees, Hoffer Plastics operates a 365,000-square-foot facility where they manufacture over three billion parts each year. Their commitment to quality is underscored by a 99% on-time delivery record and their accreditation as a MedAccred Certified Injection Molder, which ensures adherence to stringent quality standards in medical product manufacturing. Hoffer Plastics is also recognized for its sustainability efforts, having received the Illinois Governor's Sustainability Award and actively participating in initiatives aimed at reducing environmental impact. The company prides itself on its customer service and technical support, fostering long-term partnerships with clients across various sectors.


9. AdvanTech Plastics LLC

  • Website: advantechplastics.com
  • Ownership type: Private
  • Headquarters: Woodstock, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1937
  • Headcount: 51-200
  • LinkedIn: advantech-plastics-llc

AdvanTech Plastics LLC, based in Woodstock, Illinois, is a plastic injection molding company that has been operational since 1937. The firm specializes in custom manufacturing solutions tailored to various industries, with a strong emphasis on the medical and industrial sectors. Their service offerings include micro injection molding, insert molding, and pad printing, among others. AdvanTech is committed to delivering high-quality, precision-engineered products, which is reflected in their ISO 13485:2016 and ISO 9001:2015 certifications. The company operates with a focus on innovation and sustainability, actively pursuing eco-friendly practices in their manufacturing processes. Their clientele includes businesses that require reliable plastic components, and they pride themselves on their ability to meet demanding quality standards while maintaining competitive pricing. AdvanTech's facilities are equipped to handle a range of production needs, ensuring they can adapt to the evolving requirements of their customers.


10. AGS Technology Inc.

  • Website: agstechnology.com
  • Ownership type: Private
  • Headquarters: Batavia, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1995
  • Headcount: 51-200
  • LinkedIn: ags-technology-inc.

AGS Technology Inc., founded in 1995 and based in Batavia, Illinois, is a manufacturer specializing in recycled plastics injection molding. The company provides custom injection molded products and services, including engineering, assembly, and tool maintenance, primarily to OEMs and Tier 1 companies across various industries such as automotive and construction. AGS Technology is notable for its proprietary Injectoblend™ recycled plastics, which they produce in-house, ensuring quality control and cost-effectiveness. The company operates two facilities totaling over 100,000 square feet, equipped to handle a range of manufacturing needs. AGS Technology is also recognized as a certified minority-owned business, reflecting its commitment to diversity and inclusion within the industry. Their recent accolades, including multiple Supplier Excellence Awards from General Motors, further highlight their reputation for reliability and quality in the plastic manufacturing space.


11. Mega Polymers, Inc.

  • Website: megapolymers.com
  • Ownership type: Private
  • Headquarters: Romeoville, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2013
  • Headcount: 11-50
  • LinkedIn: mega-polymers

Mega Polymers, Inc., founded in 2013 and based in Romeoville, Illinois, is a private company that specializes in thermoplastic resins. The firm primarily serves the injection molding industry, offering a range of services that include compounding, distribution, and recycling of engineering-grade thermoplastics. Their product offerings include a variety of resins such as Nylon, PBT, Acetal, and ABS, among others. With a strong emphasis on quality and customer service, Mega Polymers has developed a reputation for providing tailored solutions to meet specific application requirements. The company also engages in specialty compounding, which allows them to create custom grades and formulations to address unique challenges faced by their clients. Their commitment to recycling through Mega Recycling LLC further highlights their involvement in sustainable practices within the plastics industry.


12. KI Industries, Inc.

  • Website: kiindustries.com
  • Ownership type: Private
  • Headquarters: Berkeley, Illinois, United States (USA)
  • Employee distribution: Mexico 76%, United States (USA) 24%
  • Founded year: 1964
  • Headcount: 501-1000
  • LinkedIn: ki-industries

KI Industries, Inc., based in Berkeley, Illinois, specializes in the manufacturing of decorative plastic and die-cast components. Established in 1964, the company has built a strong presence in the automotive and appliance industries, providing high-quality products and services. KI Industries offers a range of capabilities, including custom part manufacturing, injection molding, die casting, and advanced design services. They are committed to maintaining a reliable supply chain, with a significant portion of their operations based in Mexico and the United States. The company prides itself on its quality assurance, holding multiple certifications such as ISO 9001:2015 and IATF 16949 across its facilities. With a focus on innovation and customer satisfaction, KI Industries continues to adapt to the evolving needs of its clients, producing millions of components each year.


13. ADMO, Inc.

  • Website: admoinc.com
  • Ownership type: Private
  • Headquarters: Elgin, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1977
  • Headcount: 51-200
  • LinkedIn: admo-inc.

ADMO, Inc., based in Elgin, Illinois, is a private manufacturer that specializes in plastic injection-molded parts and assemblies. Established in 1977, the company has built a strong foundation in the plastic manufacturing industry, catering to various sectors including medical, automotive, and electronics. With a workforce of approximately 36 employees, ADMO operates a state-of-the-art facility that spans 40,000 square feet for manufacturing and an additional 42,000 square feet for warehousing. This setup allows them to manage production, assembly, and shipping efficiently. ADMO prides itself on its commitment to quality, as evidenced by its ISO 9001:2015 certification, and offers a comprehensive range of services from design to assembly. Their focus on sustainability and customer satisfaction further enhances their standing in the industry.


14. Flex-O-Glass, Inc.

  • Website: flexoglass.com
  • Ownership type: Private
  • Headquarters: Chicago, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1924
  • Headcount: 51-200
  • LinkedIn: flex-o-glass-inc.

Flex-O-Glass, Inc. is a Chicago-based manufacturer that has been operational since 1924. The company specializes in producing plastic products, most notably Flex-O-Glass®, a unique material originally developed for agricultural applications. Over the years, Flex-O-Glass has expanded its offerings to serve various industries, including hardware and packaging. The company prides itself on its commitment to American manufacturing, ensuring that all products are made in the USA. This dedication not only supports local economies but also fosters job creation. Flex-O-Glass operates under third-generation family ownership, which reflects a deep-rooted commitment to quality and customer service. Their custom manufacturing services further highlight their adaptability and responsiveness to client needs, making them a significant player in the plastic manufacturing industry.


15. Soarus, LLC

  • Website: soarus.com
  • Ownership type: Private
  • Headquarters: Arlington Heights, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1996
  • Headcount: 11-50
  • LinkedIn: soarus-llc

Soarus, LLC, established in 1996 and based in Arlington Heights, Illinois, operates as a specialty resin manufacturer. The company serves as the sales, marketing, and research and development arm for Mitsubishi Chemical's acetyl-based specialty products in North and South America. Soarus specializes in innovative resin products, including SoarnoL™ EVOH, a renowned gas and hydrocarbon barrier resin, and Nichigo G-Polymer™, a water-soluble and biodegradable vinyl alcohol resin. Their products cater to various industries, particularly food packaging, where they help preserve freshness and flavor. Soarus also provides technical support and R&D services, leveraging a fully equipped laboratory to assist customers in product development and application. With a dedicated team experienced in polymer science and process technology, Soarus aims to meet the evolving needs of its clients in the plastic manufacturing sector.


16. Chicago Mold Engineering Co., Inc.


Chicago Mold Engineering Co., Inc. is a private manufacturing company based in Kane, Illinois, specializing in the design and production of plastic injection and compression molds. Founded in 1944, the company has built a reputation for delivering high-quality molds and related services to various industries, including automotive and consumer electronics. Their operations encompass engineering, mold making, and machining services, ensuring efficient production processes for their clients. Chicago Mold Engineering prides itself on its skilled workforce, which includes master craftsman-caliber moldmakers known for their attention to detail and industry knowledge. The company utilizes advanced technologies, such as solid modeling CAD software, to provide accurate designs and maximize production time. With a commitment to customer service and on-time deliveries, Chicago Mold Engineering continues to adapt to the evolving needs of the plastic manufacturing industry.


17. Mastermolding Inc

  • Website: mastermolding.com
  • Ownership type: Family Owned
  • Headquarters: Joliet, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1988
  • Headcount: 11-50
  • LinkedIn: mastermolding-inc

Mastermolding Inc, founded in 1988, is a family-owned injection molding manufacturer based in Joliet, Illinois. The company specializes in providing high-quality plastic products and custom solutions tailored to meet the specific needs of its clients. With over three decades of experience, Mastermolding has developed expertise in handling challenging materials and delivering comprehensive manufacturing solutions. Their services include project management, custom tooling, and value-added processes such as rapid prototyping and assembly support. Mastermolding serves a variety of industries, including automotive, appliances, and industrial applications. The company has maintained ISO 9002 certification since 1996, demonstrating its commitment to quality and operational excellence. Mastermolding's focus on customer satisfaction and long-term partnerships positions it as a reliable player in the plastic manufacturing sector.


18. Wise Plastics Technologies

  • Website: wiseplastics.com
  • Ownership type: Family Owned
  • Headquarters: St. Charles, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1974
  • Headcount: 201-500
  • LinkedIn: wise-plastics-technologies_2

Wise Plastics Technologies, founded in 1974, is a family-owned manufacturing company based in St. Charles, Illinois. The firm specializes in custom plastic injection molding and liquid silicone molding, providing a wide array of services that include engineering, design, and contract manufacturing. With over 350,000 square feet of manufacturing space and more than 100 molding presses, Wise Plastics is equipped to handle various production needs. The company serves multiple industries, such as healthcare, automotive, and consumer products, reflecting its ability to adapt to different market demands. Wise Plastics is committed to quality, as evidenced by its ISO 9001:2015 and ISO 13485:2016 certifications, which ensure that their products meet stringent quality standards. Their focus on innovation and continuous improvement positions them as a reliable partner for clients seeking high-quality plastic manufacturing solutions.


19. P&P Industries, Inc.

  • Website: ppind.com
  • Ownership type: Family Owned
  • Headquarters: Sterling, Illinois, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1970
  • Headcount: 51-200
  • LinkedIn: p%26p-industries-inc.

P&P Industries, Inc., based in Sterling, Illinois, is a family-owned company that specializes in plastic injection molding and assembly services. Founded in 1970, the company has built a reputation for quality and innovation over its five-decade history. P&P Industries employs scientific injection molding techniques, which allow for precise control over the manufacturing process, resulting in reduced scrap rates and improved product quality. The company operates a modern facility equipped with over 30 injection molding machines, capable of handling a wide range of materials and applications. P&P serves multiple industries, including agriculture, automotive, and packaging, showcasing its ability to adapt to various market needs. Their commitment to customer satisfaction and continuous improvement is evident in their operational practices and quality management systems, which are certified under ISO 9001:2015.



Plastic Manufacturing Insights: Key Companies in Illinois


CompanyHeadquarterSizeFoundedOwnership
Custom Plastics, Inc.Elk Grove, Illinois, United States (USA)51-2001955Private
M. Holland CompanyNorthbrook, Illinois, United States (USA)201-5001950Corporate
Dinesol Plastics Inc.Niles, Illinois, United States (USA)501-10001937Family Owned
Advanced Plastics, IncLake Zurich, Illinois, United States (USA)11-501994Private
MRC Polymers IncRomeoville, Illinois, United States (USA)51-2001980Private
Hansen Plastics CorporationElgin, Illinois, United States (USA)51-2001971Private
MacLean-Fogg CompanyMundelein, Illinois, United States (USA)1001-50001925Corporate
Hoffer PlasticsSouth Elgin, Illinois, United States (USA)201-5001953Corporate
AdvanTech Plastics LLCWoodstock, Illinois, United States (USA)51-2001937Private
AGS Technology Inc.Batavia, Illinois, United States (USA)51-2001995Private
Mega Polymers, Inc.Romeoville, Illinois, United States (USA)11-502013Private
KI Industries, Inc.Berkeley, Illinois, United States (USA)501-10001964Private
ADMO, Inc.Elgin, Illinois, United States (USA)51-2001977Private
Flex-O-Glass, Inc.Chicago, Illinois, United States (USA)51-2001924Private
Soarus, LLCArlington Heights, Illinois, United States (USA)11-501996Private
Chicago Mold Engineering Co., Inc.Kane, Illinois, United States (USA)51-2001944Private
Mastermolding IncJoliet, Illinois, United States (USA)11-501988Family Owned
Wise Plastics TechnologiesSt. Charles, Illinois, United States (USA)201-5001974Family Owned
P&P Industries, Inc.Sterling, Illinois, United States (USA)51-2001970Family Owned


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