Clamshell Manufacturers and Companies

IQS Directory implements a thorough list of clamshell companies and suppliers. Utilize our listing to examine and sort top clamshell companies with previews of ads and detailed descriptions of each product. Any clamshell company can design and engineer clamshells to meet your companies specific qualifications. An easy connection to reach clamshell companies through our fast request for quote form is provided on our website. The company information includes website links, company profile, locations, phone, product videos and product information. Customer reviews are available and product specific news articles. This source is right for you whether it's for a company of plastic clamshells, stock clamshells, and vented biodegradable clamshells.

  • Greeneville, TN

    Valk Industries provides engineering and manufacturing of quality products and services, including their superior clamshells. Operations began in 1975 and Valk has expanded from providing custom machining and fabrication processes to over wrapping, component assembly and packaging products which include poster tubes and shipping tubes. Valk is committed to quality, service and reliability.

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  • Stirling, NJ

    Engineered Plastic Products custom forms & fabricates sheet thermoplastic materials, standard & specialized, for any number of industrial & commercial requirements. EPP has been widely recognized for outstanding manufacturing & service since 1958 for companies such as GE, NASA & AT&T. Custom fabricated parts can be as large as 72"x108" down to 2"x2" in any thickness up to 1 1/2". Post-forming includes all types of machining & assembly.

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  • Sparks, NV

    Quality Plastics Inc. has been a leading manufacturer of vacuum forming since 1976. Whether you need a small batch of custom vacuum-formed parts or a large-scale production run, we have the capabilities and expertise to deliver. We are committed to providing our customers with exceptional vacuum-formed products and services that meet their needs and exceed their expectations. Contact us today to learn more about our vacuum-forming capabilities.

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  • Aurora, OH

    At Lerner Molded Plastics, we specialize in crafting high-quality vacuum-formed products tailored to meet the diverse needs of our clients. With years of expertise in the industry, we take pride in our ability to deliver innovative solutions that exceed expectations.

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  • Tigard, OR

    RapidMade is a leader in thermoforming and vacuum forming solutions, offering unmatched customer experience, quality, and speed. We cater to diverse needs with a broad material and equipment portfolio, ensuring cost-effective, engineered parts. Trust us for reliable, timely delivery of your small to medium batch plastic projects, meeting the highest industry standards. Choose RapidMade for efficiency, quality, and value in every project.

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  • Edwardsburg, MI

    At Duo Form, we are pioneers in the realm of vacuum-formed plastic products. With a collective passion for precision engineering and creative problem-solving, we've established ourselves as leaders in delivering high-quality solutions to a wide range of industries.

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  • Coleman, MI

    Robinson Industries offers thermoformed and injection molded reusable, heavy duty plastic pallets, packaging and more. We are one of the largest suppliers of reusable pallets to many industries because of our expertise based on 65 years in business, our completely in-house process and our high quality certifications including ISO 9001:2008 and ISO 14001:2004. Join the Robinson Family today!

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Clamshells Industry Information


Clamshells are resealable one-piece containers made up of two halves, held together by a hinge. Named after the clamshells found in nature, which also open and close on a hinge, they are typically composed of a rigid plastic like clear PVC or polystyrene.

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Materials Used in Clamshells

Types of plastic materials used to create clamshells include:

  • Polystyrene
  • Polyvinyl Chloride (PVC)
  • Polyester
  • Various Other Thermoplastics and Polymers

Every plastic type offers different qualities.

Hard, clear and inexpensive to produce. It is available in a variety of different forms, including solid sheet/molded plastic and foam. In addition to being clear, it can also be colored. It, however, is known to degrade very slowly and its use is regarded dubiously by environmental scientists.
Polyvinyl Chloride (PVC)
Known as an excellent insulator and resistor of the chemicals in substances like salts, acids, fats, bases, fuels, paint thinners and alcohols. It may be rigid or elastic. PVC degrades much better than polystyrene, but it still should be recycled rather than thrown away.
Available in different types, with varying hardnesses and thermal and chemical stabilities. Also, polyester clamshells have refreshingly low toxicity levels and are recyclable.

Types of Clamshells

There are a few types of clamshell packaging:

  • Clamshell Trays
  • Egg Crate Clamshells
  • Tri-Fold Clamshells
  • Custom Clamshells
Clamshell Trays
Used to package and display products simultaneously, like, for example, blueberries and other fruit, small tools like screws and pins and any number of other items.
Egg Crate Clamshell
Hold and divide products. They are named, of course, after egg cartons, though they also hold other rounded items, like golf balls.
Tri-Fold Clamshell
Finally, tri-fold clamshells are designed with a flat bottom so they can stand on display. These can be used to hold all sorts of products, like remote controls and other electronic goods, locks, handheld thermometers, sporting goods and more.
Custom Clamshell Packaging
In addition to these standard designs, clamshells are also available in a variety of custom configurations, and, of course, all clamshells are purchasable in different shapes and sizes. To find out more, reach out to an experienced clamshell and packaging manufacturer today.

Production Process of Clamshells

Clamshells can be made using a variety of plastic forming processes, but the most common methods implemented on their behalf are thermoforming, pressure forming and vacuum forming. Thermoforming is a process by which plastic material is heated, stretched and cooled into parts.

Pressure forming and vacuum forming are both sub-processes of thermoforming and, therefore, they all begin the same way: First, plastic sheets are fed into heaters powered either by electricity, infrared radiation or natural gas, where they are warmed until they are elastic and malleable.

Once this step is complete, they are transferred to a forming station, which is where the deviations take place. If, at this point, the plastic is being pressure formed, pressurized air pushes it into a pressure-controlled mold. If, instead, it is being vacuum formed, the plastic will be enclosed in a mating mold and pressure box, where a vacuum will suction all of the air out and pull the plastic into the mold. Both methods are viable, but if a manufacturer is attempting to form a clamshell with greater precision or with more intricacies, pressure forming is the recommended choice, because it yields stronger adherence. Whatever a manufacturer’s choice, once the plastic has cooled, it is ejected from the mold using rigid reverse airflow.

At this point in the process, the clamshell exists either as two separate components or a single sheet. If the former is the case, manufacturers proceed by fusing the edges together to create a hinge, using either stamping, welding or heat treatments. If the latter, manufacturers simply fold the sheet to create a hinge, then heat seal it.

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