Plastic injection molding is a production process that stands out for its great versatility, productivity, and quality of the final result, in addition to being a waste-free option, allowing scraps and burrs to be reused.

It’s hard to think what the world would be like today without plastic. To realize this, we just need to look around us. Polymers are present in almost everything we use in our daily lives, from food preservation to smartphones.

The wide variety of applications that plastic supports comes from its characteristics, in particular its moldability that allows the material to assume practically any shape.

Come with us. In this post, you will find out who are the 5 largest plastic injection molding companies in the USA and also see their contact details and strengths.

1. Seaway Plastics Engineering


In Seaway Plastics Engineering, the manufacturing of plastic parts and containers is a key input for the growth of the industry. Their certified processes guarantee the quality of the plastic injection molds produced. During their professional years, they have accompanied national and international companies in manufacturing projects to meet the needs of markets; which has led Seaway to be today, in 2024, one of the most outstanding companies in the field of industrial product manufacturing.

They have a modern machinery park equipped with the latest advances in injection. All peripherals are of the highest quality to ensure products that meet or exceed our customers’ expectations. Their value-added services include EMI shielding, assembly, pad printing, ultrasonic welding, and more.

Location: Port Richey, Florida, USA

Founded in: 1991

Products: Prototype injection molding, plastic mold design, mold making, and low-volume production

2. TDLMould Company

TDL Plastic Mould company specializes in providing professional 3D printing services, including plastic mold making, industrial design, robotics technology, and automation. TDL is providing large-scale production of plastic products using injection molding machines and is providing a full production cycle: from preparing the raw material base, developing the technological process, casting plastics, and engineering polymers, to assembling and delivering finished products to industrial customers.

They are working with HASCO, DME & LKM standards to ensure quality and have adopted the latest technologies like CAD/CAM/CAE systems, robots for extraction, etc. They use the customer’s molds or design and manufacture reliable equipment of any configuration. And of course, their production complex is equipped with modern equipment from the world’s leading manufacturers.

The plastic injection company in China manufactures plastic parts for the Medical, Automotive, Aerospace, Consumer Products, Electric, Electronics, Energy, Robotics and Automation Industries. The company is not only serving these industries in China but is also a leading name in many countries like the USA.

Location: Dongguan, Guangdong, China.

Founded in: 1995

Certification: ISO9001,IATF16949:2016, ISO 13485:2016

Products: Custom plastic injection molding, Mold design, CNC Machining,  3D Printing

3. The Plastek Group


The Plastek Group is one of the top manufacturers of plastic packaging, specializing in product design and packaging development. The company has grown into a global supplier of plastic molds.

Location: Pennsylvania, USA

Founded in: 1956

Certifications: HMD BRC/IOP, CPD BRC, SMD BRC, Quality – ISO 9001,

ISO 13485 for medical devices, ISO 14001 Environmental, ISO 45001 Health & Safety, FSSC 22000

Products: Stock Packages, Custom Product Design, Tool Build and mold making

Company Strength: With more than 80 years of experience, the company’s main activity involves Package Design and development, Mold Design and Manufacturing, and Molding and assembly in providing thermoplastic injection services. Knowing their origin and with the ambition to continue growing, they are already working in many countries with state-of-the-art machines in their facilities. The advanced technological use allows them to provide injection molding services in Personal Care and Beauty, Home Care, Pharmaceutical Packaging, and Food and Beverage industries.

Their plastic injection machines are equipped with robots for the extraction of parts and with pressure-sensitive labeling equipment to improve the labeling and decoration of the parts. They have strengthened their productivity with technologies such as multi-component injection, gas injection, auto inspection, or over-injection systems for parts with manual molds.

4. Britech Industries

Britech Industries is appreciated for the quality of injection molding plastic parts and excellent customer services including quick delivery services, technician visits, and maintenance services. The company has been making its mark from the year 1984 but it started working in the field of plastic injection molding in 1996 and is providing services in industries such as Aerospace, Medical, Electric, Home Appliances, Automotive, Hardware, Furniture, and many more.

At Britech Industries, professionals are aware of the need that industrial companies have to obtain standardized plastic parts. The company provides Custom Thermoplastic Injection Molding services by automating the process and doing cellular Manufacturing with the help of Injection Molding Machines from 40 to 300 tons. The professional team will provide you with the ideal solution in the shortest amount of time due to extensive experience in the plastic and industrial sectors.

Location: Florida, USA

Founded in: 1996

Certification: ISO 9001 – 2015

Products: Custom injection molded thermoplastic parts

5. Jones Plastic & Engineering


Jones Plastic & Engineering is one of the pioneers, with 50 years of experience. It is the leading injection molder for automotive mold technology and home appliance molds. It is known for molding expertise, special finishes, and the ability to help customers quickly get their products to the market. One of the best strengths they provide is in-house 3D printing. They offer a comprehensive mold design, manufacturing, and decoration service covering all production processes, from the design to the finishing of the piece. Industries they are serving are automotive, outdoor sports goods, Powersports Vehicles, and Household Products.

Location: Kentucky, USA

Founded in: 1961

Products: Custom injection molded thermoplastic parts,  tools, 3D printing


If you go for any of the above-mentioned companies then you can definitely get a type of injection molding that meets your needs and is ideal for your product.  It is also worth mentioning that these companies have the technology and development of thermoplastic injection and polymers allow you to create customized materials so that your products or parts have the characteristics you desire. To learn more about how the plastics industry can be a partner in your success and stay up to date with all the news about thermoplastic injection, follow our social networks and stay tuned to our blog!