Connecticut's plastic manufacturing industry plays an essential role in supplying materials for various sectors, from packaging to automotive parts. Companies here produce an array of products, including additives, polymers, and custom molds, streamlining manufacturing processes across diverse industries. The shift towards sustainable practices and recycling in recent years is driving innovation within the sector. As consumer demands grow for eco-friendly materials, many companies are adapting by expanding their offerings to include biodegradable and recycled plastic products. This focus on sustainability will likely define the industry's future, ensuring relevance in a competitive global market.


The companies on this list are primarily based in Connecticut, with a mix of family-owned businesses and private firms operating across various sizes. Founded between 1911 and 2010, these firms focus on manufacturing plastics, molding services, and value-added solutions tailored to industries like healthcare and consumer goods. Notable firms include R. T. Vanderbilt Co., which has over a century of experience, and newer entries like Burteck, showcasing the state’s balance between legacy and innovation in the manufacturing sector.


Continue reading to discover the foremost plastic manufacturing companies in Connecticut.


Top 19 Plastic Manufacturing Companies in Connecticut


1. R. T. Vanderbilt Co.

  • Website: rtvanderbilt.com
  • Ownership type: Private
  • Headquarters: Norwalk, Connecticut, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1916
  • Headcount: 501-1000
  • LinkedIn: r.-t.-vanderbilt-co.

R.T. Vanderbilt Holding Company, Inc., established in 1916, is a private chemical manufacturer and mineral supplier based in Norwalk, Connecticut. The company operates through several subsidiaries, including Vanderbilt Chemicals, LLC, which produces a range of additives and materials for various applications, including plastics. With over a century of experience, R.T. Vanderbilt is dedicated to providing high-quality raw materials and technical support to industries such as petroleum, rubber, pharmaceuticals, and personal care. Their commitment to customer needs and adherence to industry standards is evident in their operations, which span across the United States and into international markets. The company is also certified under the ISO 9001 standard and participates in the American Chemistry Council’s Responsible Care® initiative, reflecting their focus on quality and safety in their manufacturing processes.


2. AXEL Plastics


AXEL Plastics Research Laboratories, Inc. is a family-owned chemical manufacturer based in Monroe, Connecticut, specializing in mold release agents and process aid additives for the plastics, composites, rubber, and urethane industries. Established in 1941, the company has evolved from its origins in wartime research to become a key player in the global market, serving manufacturers across six continents. AXEL's product offerings include a wide range of solutions designed to enhance production efficiency and product quality. The company prides itself on its commitment to customer support and product development, backed by a team of experienced chemists and production engineers. In recent years, AXEL has made strides in sustainability, installing solar panels at their facility to reduce their carbon footprint. They are certified with ISO 9001:2015 and are working towards additional certifications, ensuring compliance with international standards. With a workforce of around 50 employees, AXEL continues to innovate and adapt to the changing needs of the industry.


3. Muehlstein

  • Website: muehlstein.com
  • Ownership type: Family Owned
  • Headquarters: Wilton, Connecticut, United States (USA)
  • Employee distribution: United States (USA) 69%, Mexico 13%, Ecuador 5%, Other 13%
  • Founded year: 1911
  • Headcount: 51-200
  • LinkedIn: muehlstein

Muehlstein, founded in 1911, is a family-owned company based in Wilton, Connecticut. It specializes in the distribution of plastic resins, focusing on a wide range of polymers including polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), and styrenics. Muehlstein serves over 1,100 customers, providing essential supply solutions and inventory management services. The company operates as part of the Ravago Group, which enhances its global reach and operational capabilities. Muehlstein is committed to sustainability, marketing over 200 million pounds of recycled products annually. Their extensive inventory and logistical capabilities, including a private fleet of railcars and trucks, allow them to meet the demands of their clients efficiently. Muehlstein's entrepreneurial culture fosters innovation and flexibility, making them a reliable partner in the plastic supply chain.


4. Modern Plastics

  • Website: modernplastics.com
  • Ownership type: Private
  • Headquarters: Shelton, Connecticut, United States (USA)
  • Employee distribution: United States (USA) 39%, Pakistan 33%, United Arab Emirates 13%, Other 14%
  • Founded year: 1945
  • Headcount: 11-50
  • LinkedIn: modern-plastics

Modern Plastics, based in Shelton, Connecticut, is a private company that has been operational since 1945. Initially starting as a glass distributor, it transitioned into the plastic industry, specializing in high-performance engineering and medical-grade plastics. The company serves a variety of sectors, including medical, defense, and aerospace, providing services such as custom casting, precision cutting, and recycling. Modern Plastics operates from a state-of-the-art facility and emphasizes quality and customer satisfaction. They have established a strong reputation for their medical plastics division, which boasts a significant inventory of lot-controlled medical-grade products. The company is ISO certified, ensuring adherence to rigorous quality standards. With a dedicated workforce and a commitment to innovation, Modern Plastics continues to adapt to the evolving needs of its customers in the plastic manufacturing industry.


5. Osterman & Company

  • Website: osterman-co.com
  • Ownership type: Family Owned
  • Headquarters: Cheshire, Connecticut, United States (USA)
  • Employee distribution: United States (USA) 76%, Costa Rica 17%, Canada 3%, Other 4%
  • Founded year: 1975
  • Headcount: 51-200
  • LinkedIn: osterman-%26-company

Osterman & Company, founded in 1975 and based in Cheshire, Connecticut, is a family-owned business that specializes in polymer distribution and trading. The company provides a wide range of plastic resins tailored for various applications, such as blown film, injection molding, blow molding, and extrusion. With a workforce of approximately 157 employees, Osterman serves a broad spectrum of manufacturing industries, ensuring that clients have access to reliable supply chains and high-quality materials. They handle over a billion pounds of material each year, showcasing their significant role in the market. Osterman's commitment to customer service is evident in their technical support and market intelligence, which help clients make informed decisions about their resin needs. Their operations extend beyond the United States, with a presence in Latin America and international markets, further solidifying their position in the polymer distribution sector.


6. Polymer Resources Ltd.

  • Website: prlresins.com
  • Ownership type: Corporate
  • Headquarters: Farmington, Connecticut, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: $20.0M, January 2017
  • Founded year: 1974
  • Headcount: 51-200
  • LinkedIn: polymer-resources-ltd-

Polymer Resources Ltd. is a manufacturing company based in Farmington, Connecticut, specializing in polymer resins and thermoplastic compounds. Established in 1974, the company has built a reputation for providing high-quality materials tailored to the needs of various industries, including electrical, medical devices, consumer goods, and construction. With a workforce of approximately 81 employees, Polymer Resources emphasizes technical support and customer-centric solutions, ensuring that they meet the specific requirements of their clients. Their product range includes a variety of resins such as polycarbonate, ABS, and nylon, among others. The company is committed to quality, as evidenced by their ISO 9001 certification, which reflects their adherence to rigorous quality management standards. Polymer Resources also highlights their financial stability and ongoing investment in manufacturing assets, which further solidifies their position in the industry.


7. ProMold Plastics

  • Website: promoldplastics.com
  • Ownership type: Private
  • Headquarters: Portland, Connecticut, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1967
  • Headcount: 11-50
  • LinkedIn: promold-plastics

ProMold Plastics, based in Portland, Connecticut, has been a significant player in the custom injection molding and mold making industry since its inception in 1967. Originally a one-man Tool & Die shop, the company has grown into a contract manufacturer with over 40,000 square feet of manufacturing space. ProMold Plastics specializes in producing precision injection molds and molded components, serving key sectors such as medical devices, electronics, and automotive industries. Their service offerings include engineering support, mold design, and secondary operations, which enhance their ability to meet customer needs effectively. The company prides itself on its commitment to quality, employing advanced statistical quality control techniques to ensure that their products meet stringent industry standards. ProMold Plastics emphasizes the importance of domestic manufacturing, promoting the benefits of products made in the USA. This focus not only supports local economies but also appeals to clients who prioritize quality and reliability in their supply chains.


8. Plastube Inc.

  • Website: plastube.com
  • Ownership type: Corporate
  • Headquarters: Granby, Connecticut, United States (USA)
  • Employee distribution: Canada 76%, United States (USA) 19%, Algeria 6%
  • Latest funding: October 2017
  • Founded year: 1963
  • Headcount: 51-200
  • LinkedIn: plastube

Plastube Inc., established in 1963 and based in Granby, Connecticut, is a packaging manufacturer that specializes in the production of plastic tubes. The company serves a variety of industries, including cosmetics, pharmaceuticals, and food, providing high-quality packaging solutions that enhance product presentation and protect contents. Plastube offers a range of products such as extruded tubes, digital printing services, and eco-friendly packaging options. Their commitment to innovation is evident in their advanced manufacturing processes and their focus on sustainability, which includes the use of recycled materials and eco-friendly practices. With a workforce of 51-200 employees, Plastube has maintained a significant presence in the market, catering primarily to businesses seeking reliable and visually appealing packaging solutions.


9. Ensinger Precision Components, Inc.

  • Website: ensinger-pc.com
  • Ownership type: Private
  • Headquarters: Putnam, Connecticut, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1934
  • Headcount: 51-200
  • LinkedIn: ensingerprecisioncomponents

Ensinger Precision Components, Inc. is a plastic manufacturer based in Putnam, Connecticut, with additional operations in Huntersville, North Carolina. Established in 1934, the company specializes in high-performance plastics and injection molding services. They cater to a variety of industries, including aerospace, medical, oil & gas, and semiconductor, providing advanced manufacturing solutions tailored to the specific needs of their clients. Their operations include CNC machining, quality assurance, and engineering support, ensuring that they meet stringent industry standards. As part of the global Ensinger GmbH organization, they leverage extensive resources and expertise in high-performance polymers, enhancing their ability to deliver innovative solutions. Ensinger Precision Components is dedicated to maintaining high quality and precision in their manufacturing processes, which is critical for the demanding applications they serve.


10. MacDermid Enthone Industrial Solutions


MacDermid Enthone Industrial Solutions, founded in 1989 and based in Waterbury, Connecticut, is a private chemical manufacturer that specializes in surface finishing solutions. The company provides a wide array of products aimed at improving the durability and aesthetics of materials across various industries, including automotive and electronics. Their product portfolio includes anti-corrosion treatments, decorative coatings, and notably, plating on plastics. This specific area of focus highlights their commitment to enhancing plastic components through advanced chemical processes. Additionally, MacDermid Enthone is dedicated to environmental compliance and sustainability, offering plastic recycling solutions that contribute to the circular economy. With a workforce of approximately 915 employees, the company operates globally, with significant presence in countries like India, Germany, and Italy, reflecting its international reach and influence in the surface finishing market.


11. Burteck

  • Website: burteckllc.com
  • Ownership type: Private
  • Headquarters: Bloomfield, Connecticut, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2010
  • Headcount: 11-50
  • LinkedIn: burteck

Burteck LLC, founded in 2010 and based in Bloomfield, Connecticut, is a manufacturer specializing in plastic injection molds. The company provides comprehensive services that include design, development, and turnkey solutions tailored primarily for original equipment manufacturers (OEMs) and molders. Their expertise spans several sectors, notably medical, automotive, and consumer products, where they focus on delivering high-quality, production-ready molds. With a team boasting over twenty years of experience in mold building, engineering, and project management, Burteck emphasizes the use of state-of-the-art technology and automation to enhance manufacturing efficiency. The company has recently expanded its operations into a new 40,000 square foot facility, reflecting its growth and commitment to meeting customer needs. Burteck's dedication to customer satisfaction is evident in their rigorous qualification procedures for molds, ensuring that each product meets or exceeds industry standards before delivery.


12. Plastic Design International Inc.


Plastic Design International Inc., based in Middletown, Connecticut, is a private manufacturing firm that has been operational since 1977. The company specializes in plastic injection molding and mold making, providing precision-engineered plastic components tailored for various sectors, including construction and defense. With a workforce of 11-50 employees, Plastic Design International emphasizes collaboration with clients to ensure that production meets specific requirements. Their facilities span 55,000 square feet and house 21 molding machines with capacities ranging from 35 to 385 tons. The company is ISO 9001:2015 certified, ITAR compliant, and RoHS compliant, reflecting their commitment to quality and regulatory standards. They offer a range of value-added services, including engineering support, process validation, and advanced product quality planning, which further enhances their manufacturing capabilities. Plastic Design International continues to adapt and innovate, ensuring they remain a relevant player in the plastic manufacturing sector.


13. Vanderbilt Chemicals, LLC

  • Website: vanderbiltchemicals.com
  • Ownership type: Private
  • Headquarters: Norwalk, Connecticut, United States (USA)
  • Employee distribution: United States (USA) 95%, Japan 5%
  • Founded year: 1916
  • Headcount: 201-500
  • LinkedIn: vanderbilt-chemicals-llc

Vanderbilt Chemicals, LLC, based in Norwalk, Connecticut, is a private chemical manufacturer with a rich history dating back to 1916. Originally founded by Robert Thurlow Vanderbilt, the company has evolved significantly over the years. Today, it specializes in a wide array of chemical products tailored for various industries, including petroleum, rubber, and notably, plastics. Vanderbilt Chemicals offers over 800 products across twelve different markets, with a strong emphasis on providing high-quality additives that enhance product performance and durability. Their involvement in the plastics sector includes the production of polymer stabilizers, antioxidants, and processing aids, which are crucial for improving the quality and lifespan of plastic materials. The company operates manufacturing facilities in Bethel, Connecticut, and Murray, Kentucky, and maintains a global presence, serving customers in approximately 80 countries. Vanderbilt Chemicals is committed to sustainable practices and adheres to the ACC Responsible Care® guidelines, ensuring a focus on environmental, health, safety, and security performance.


14. AllStar Therapy

  • Website: allstartherapy.net
  • Ownership type: Private
  • Headquarters: Avon, Connecticut, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2006
  • Headcount: 201-500
  • LinkedIn: allstar-therapy

AllStar Therapy, based in Avon, Connecticut, is a private company founded in 2006. It operates under the name Yangzhou Hongxin Line Equipment Co., Ltd. and has a workforce of approximately 201-500 employees. The company specializes in the production of plastic polymer products, with a strong emphasis on the telecommunications and construction industries. Their product offerings include high-density polyethylene (HDPE) pipes and military logistics boxes, catering to clients such as telecom companies and construction firms. AllStar Therapy is dedicated to maintaining high manufacturing standards and has established a reputation for quality in its sector. The company has not reported any funding activities, indicating a self-sustained operational model.


15. Dymotek

  • Website: dymotek.com
  • Ownership type: Private
  • Headquarters: Ellington, Connecticut, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2004
  • Headcount: 51-200
  • LinkedIn: dymotek

Dymotek, based in Ellington, Connecticut, is a manufacturing company that specializes in plastic injection molding and liquid silicone molding. Established in 2004, Dymotek has carved out a niche in producing high-quality molded components for various industries, including medical, automotive, consumer, and industrial sectors. The company prides itself on utilizing advanced technologies to enhance production efficiency and product quality. Dymotek's capabilities include multi-material solutions and automated processes, which are essential for meeting the complex demands of modern manufacturing. They operate two facilities in Connecticut and have been recognized for their commitment to employee development and community involvement, receiving awards for their educational initiatives and workplace culture. Dymotek is ISO 9001:2015 and ISO 13485:2016 certified, ensuring that they adhere to rigorous quality management standards.


16. PTA Plastics

  • Website: ptaplastics.com
  • Ownership type: Private
  • Headquarters: Oxford, Connecticut, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: Other (Grant), $100,000, September 2021
  • Founded year: 1953
  • Headcount: 201-500
  • LinkedIn: pta-corporation-dba-pta-plastics

PTA Plastics, founded in 1953, is a custom plastic injection molder based in Oxford, Connecticut, with an additional facility in Longmont, Colorado. The company specializes in high-precision manufacturing solutions, offering services that include design for manufacturability, in-house moldmaking, and various specialty molding techniques. PTA Plastics primarily serves clients in the medical, defense, and safety and security sectors, providing them with innovative and reliable plastic components. The company prides itself on its commitment to quality and customer collaboration, ensuring that each project is executed with precision. With over 1,000 completed projects and a workforce of around 250 employee-owners, PTA Plastics emphasizes continuous improvement and invests in cutting-edge technologies to enhance its manufacturing processes. The company holds several certifications, including ISO 9001:2015 and ISO 13485:2016, which further underscores its dedication to maintaining high standards in production and quality control.


17. Stelray Plastic Products, Inc.

  • Website: stelray.com
  • Ownership type: Private
  • Headquarters: Ansonia, Connecticut, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1965
  • Headcount: 11-50
  • LinkedIn: stelray-plastic-products

Stelray Plastic Products, Inc. is a custom plastic injection molding manufacturer based in Ansonia, Connecticut. Established in 1965, the company specializes in providing tailored solutions for various industries, including aerospace, automotive, healthcare, and consumer electronics. With a workforce of approximately 34 employees, Stelray operates a facility that is ISO 9001:2015 certified and FDA registered, ensuring adherence to high-quality standards and regulatory compliance. Their services range from mold making and engineering to post-mold operations, such as ultrasonic welding and assembly. Stelray's expertise in handling a wide array of plastic resins, including biodegradable options, reflects their commitment to innovation and sustainability. The company has built a reputation for delivering high-quality components and maintaining strong relationships with clients, including several Fortune 500 companies. Their focus on precision and efficiency in manufacturing processes positions them as a significant player in the plastic products sector.


18. ABA-PGT Incorporated

  • Website: abapgt.com
  • Ownership type: Private
  • Headquarters: Manchester, Connecticut, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1944
  • Headcount: 51-200
  • LinkedIn: aba-pgt-incorporated

ABA-PGT Incorporated, based in Manchester, Connecticut, is a private manufacturing company that has been operational since 1944. The firm specializes in high precision plastic parts and gear design, offering a range of services that include injection molding, tooling, and engineering solutions tailored for the manufacturing sector. With a workforce of approximately 87 employees, ABA-PGT emphasizes quality assurance and customer satisfaction, making them a trusted partner for companies in need of precision components. Their manufacturing facility spans 68,000 square feet, complemented by a 15,000 square foot lights-out facility, showcasing their commitment to modern manufacturing practices. The company employs advanced technologies, such as automated molding processes and state-of-the-art inspection equipment, to ensure high-quality outputs. ABA-PGT is also recognized for its certifications, including ISO 9001:2015 and UL recognition, which further solidify its standing in the industry.


19. Polyform Cellular Plastics, Inc.

  • Website: polyform.com
  • Ownership type: Corporate
  • Headquarters: Granby, Connecticut, United States (USA)
  • Employee distribution: Canada 100%
  • Latest funding: December 2017
  • Founded year: 1963
  • Headcount: 201-500
  • LinkedIn: plastiques-cellulaires-polyform-inc-

Polyform Cellular Plastics, Inc., established in 1963, is a manufacturer based in Granby, Connecticut, specializing in expanded cellular plastics. The company produces a range of products, including expanded polystyrene (EPS) and polypropylene (PPE), primarily serving the construction and manufacturing sectors. Polyform is dedicated to providing insulation solutions that enhance energy efficiency and protect goods during transport. Their products are designed to meet the needs of various applications, from insulation panels to packaging materials. With a workforce of around 28 employees, Polyform remains an active participant in the plastic manufacturing industry, focusing on innovation and sustainability in their product offerings. They have not reported any recent funding, indicating a stable operational model without external financial dependencies.



Plastic Manufacturing Insights: Key Companies in Connecticut


CompanyHeadquarterSizeFoundedOwnership
R. T. Vanderbilt Co.Norwalk, Connecticut, United States (USA)501-10001916Private
AXEL PlasticsMonroe, Connecticut, United States (USA)51-2001941Family Owned
MuehlsteinWilton, Connecticut, United States (USA)51-2001911Family Owned
Modern PlasticsShelton, Connecticut, United States (USA)11-501945Private
Osterman & CompanyCheshire, Connecticut, United States (USA)51-2001975Family Owned
Polymer Resources Ltd.Farmington, Connecticut, United States (USA)51-2001974Corporate
ProMold PlasticsPortland, Connecticut, United States (USA)11-501967Private
Plastube Inc.Granby, Connecticut, United States (USA)51-2001963Corporate
Ensinger Precision Components, Inc.Putnam, Connecticut, United States (USA)51-2001934Private
MacDermid Enthone Industrial SolutionsWaterbury, Connecticut, United States (USA)1001-50001989Private
BurteckBloomfield, Connecticut, United States (USA)11-502010Private
Plastic Design International Inc.Middletown, Connecticut, United States (USA)11-501977Private
Vanderbilt Chemicals, LLCNorwalk, Connecticut, United States (USA)201-5001916Private
AllStar TherapyAvon, Connecticut, United States (USA)201-5002006Private
DymotekEllington, Connecticut, United States (USA)51-2002004Private
PTA PlasticsOxford, Connecticut, United States (USA)201-5001953Private
Stelray Plastic Products, Inc.Ansonia, Connecticut, United States (USA)11-501965Private
ABA-PGT IncorporatedManchester, Connecticut, United States (USA)51-2001944Private
Polyform Cellular Plastics, Inc.Granby, Connecticut, United States (USA)201-5001963Corporate


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