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Plastic Molding Manufacturers and Companies

Plastic processes differ greatly in both the way they form plastic products and in the shape and structural integrity of the products they manufacture. Blow molding, for example, is nearly the sole method by which plastic bottles for beverages, household cleaners and cosmetic products are made, as well as a range of low-cost toys and parts with low to medium performance. The extrusion process creates linear profiles, strips and sheets with high structural integrity useful in many construction siding, trim and furniture applications. Vacuum forming, or thermoforming, forms trays, linings and thin plastic packaging from heated plastic sheets, while dip molding forms a variety of soft molds and plastic coatings. Other plastic molding processes use casts, or dies; injection molding squeezes melted (or “plasticized”) plastic resin into a closed mold, forming a solid plastic object, while rotational molding uses a type of gyroscope to evenly coat the inside of a mold, creating hollow parts with high impact resistance. Plastic molding processes vary greatly in cost. High end plastic molding processes, such as rotational molding and injection molding, provide precision three dimensional plastic parts with structural integrity and impact resistance few other processes or materials can provide. On the other end of the spectrum, blow molding and dip molding processes offer very affordable options for long runs and mass production of containers and household commodity items. A wide range of plastic materials are molded through these processes, although some processes are more effective with certain polymers than others.

Types of Plastic Molding:

Fiberglass Fabricators

Fiberglass fabrication is the process of combining thin glass fibers with different resins to produce a strong, light weight product. Since the introduction of fiberglass, it has been used as a reinforcing agent for plastics as well as insulation in buildings and appliances. Fiberglass is used in fabrication applications that demand light-weight material with high-strength and scratch-resistant qualities.

All Plastics and Fiberglass, Inc.

With over 100 years combined experience, All Plastics and Fiberglass has the experience to handle all your fiberglass needs. No matter how large or small the job is, AP & F is committed to a process that assures its valued customers of the highest quality fiberglass fabrications available on the market. You can count on AP & F, Inc.'s products to not only being the best, but also built to last.

Fiberdome Inc.

We have years of experience and we pay extra attention when constructing our fiberglass products. We take pride in saying that we are a turnkey manufacturer and we will work with you to determine the best products for your particular application. Our fiberglass fabrication is second to none. Our seasoned teams are well versed in creating these products. If you would like to learn more then please give us a call today!

Liberty Pultrusions

Our business, for 35+ years, has produced fiberglass reinforced pultrusions in custom or stock shapes. Some of our pultruded fiberglass products include structural shapes, electrical shapes, fiberglass rod and tubing that are used for cooling towers, structural supports and more.

View a full list of Fiberglass Fabricator Manufacturers

Injection Molded Plastics

This is one of the most common forms of plastic molding, and the process can range widely in cost, depending on the complexity of the part being molded and the materials which are used. Injection molding produces three dimensional, solid parts with mid to high strength and is unique in plastic molding processes, as it can produce relatively complex shapes. Advanced injection molding techniques include insert molding and reaction injection molding (RIM); insert molding dies contain a solid object, such as an electric coil, around which the molten plastic is injected, creating an encapsulated object. Reaction injection molding combines a liquid resin thermoset polymer (typically polyurethane) with liquid polyisocyanate, which acts as a reagent within the mold, causing the polymers to expand and form bubbles (either open or closed cell foam), filling the mold.

Injection molding machines consist of three main sections: the hopper, where plastic resin pellets are fed into the machines; the extruding barrel, containing a small screw conveyor which simultaneously “plasticizes”, or melts, the plastic resin while moving it towards the die; and the die, or closed mold, into which the melted plastic is injected under pressure. The plasticizing of the resin is often assisted by electric band heaters and cartridge heaters wrapped around the extruding barrel.

GSH Industries, Inc.

GSH Industries has been manufacturing plastic products since 1986 and we are continuously developing the best solutions in our industry. We are committed to developing high quality custom plastics. GSH Industries has several different divisions.

Britech Industries

Britech Industries is a supplier of rubber products for a wide range of industries. We have experience dating back to 1984. Britech Industries is a forward-thinking company.

Molded Devices, Inc.

We manufacture a variety of injection molded plastics for industries around the world. We use the latest technology, most innovative systems, and digital manufacturing to ensure that we create products that you can rely on.


Technomag offers a wide variety of injection molded plastics. We have been providing high quality plastics since we first opened our doors in 1999.

View a full list of Injection Molded Plastics Manufacturers

Plastic Extrusions

Plastic extrusions are formed similarly to the way injection molded plastics are formed, although extrusions are formed through an open die. Plastic resins such as PVC, acrylic, polypropylene or ABS are fed through a hopper into the extruding barrel, which shears and melts the resin, pushing it through the open die to form a profile or shape. This profile is immediately immersed in cold water to set the plastic; the profile is extruded continuously, passing through the die, through cold water tanks and onto a sawing table, where pre-specified lengths are cut.

Extruded plastics may be manufactured to meet the specifications for a broad range of niche applications, including but not limited to building trim, window and door sealants, vinyl siding, PVC pipe and surgical tubing. Plastic sheets and flexible plastic sheet rolls are also formed through extrusion, being pulled and stretched instead of cooled after the melted plastic exits the die; flexible plastic sheets are rolled through a series of large calenders before being rolled onto a tube.

Preferred Plastics, Inc.

Preferred Plastics, Inc., who got our start in 1975, is a leading manufacturer of custom extruded thermoplastic resins, specializing in flexible, rigid, and co-extruded products..

Polytec Plastics, Inc.

Polytec Plastics, Inc. is committed to manufacturing the highest quality plastic extrusions available. Our engineers offer a multitude of benefits and value-added services to our customers.

SFR Industries Inc.

We are a leading manufacturer for plastic extrusions with over 150 years of experiences. SFR Industries Inc offers unique products that meet all of our customers' needs. We strive to create long lasting relationships with our clients.

Absolute Custom Extrusions, Inc.

Absolute Custom Extrusions, Inc. is proud to say we are a woman-owned small business with manufacturing experiences dating back to 1986. We are dedicated to providing high quality plastic profiles.

View a full list of Plastic Extrusion Manufacturers

Plastic Blow Molding

Plastic blow molding is the process of using compressed air and molten plastic in the form of a parison to create hollow, thin-walled containers and products. Blow molded plastic products are used in a wide variety of industries such as consumer, automotive, beverage and more. The malleable properties of plastic, combined with the versatility of the plastic blow molding process ensure the usefulness of this process to many manufacturers.

R&D Molders, Inc.

With us, customer service is our number one priority. That is why some of our clients have been with us since the very beginning in the 1970s. Today, customer service is as important as ever. Our extensive research program is continually creating new ways to create high quality products for a reduced amount of cash. Visit our website or give us a call today to find out how we can help you!

Custom-Pak, Inc.

Custom-Pak is one of the world's largest industrial plastic blow molding manufacturers. Our plants recycle all purchased materials and we recycle nearly 20 million pounds of plastics annually for other molders. We offer responsible, world class services and unbeatable value. The group at Custom-Pak is always happy to answer your questions. Let us know how we can help.

Manufacturers Custom Products

We are a turn key supplier of blow molding services and our blow molded solutions come a variety of sizes ranging from 1 pound to 80 pounds. These products are ideal for a wide range of industries including: automotive, agriculture, construction, military, transportation, medical, food & beverage and much more.

Gemini Group, Inc.

The plastic blow molding industry can start to feel the same, but here at Canyon Plastics, our 40+ years of industry experience sets us apart from the competition. We have remained a top contender throughout our history thanks to our commitment to customers.

View a full list of Plastic Blow Molding Manufacturers

Plastic Dip Molding

Dip molding plastic is one of the simplest means of molding plastic and, like blow molding, is capable of producing a large number of parts or products at low cost. The dip molding process serves in one of two manufacturing capacities: to create whole flexible or rigid products such as rubber gloves, condoms and plastic caps; or to coat pre-manufactured products such as wire racks, wire cable and plastic coated handles.

Both manufacturing methods use the same basic process: a large volume of glass or metal molds are surface prepped, so that the final product may be easily stripped from the mold when dry. Objects which are to be coated in plastic are buffed and prepped so that the plastic coating stays firmly on. The molds are then dipped into a vat of molten polymer or elastomer resin; depending on the desired thickness and the consistency of the polymer material being used, molds are often dipped multiple times, sometimes alternating between cold water or another solidifying reagent and the molten polymer vat. Flexible products with complex layers, such as kitchen gloves, may have other layers, such as a fabric layer, applied in between polymer coats. Once the molten plastic has set, the plastic product is ready to be removed from the mold, trimmed, cleaned and finished.

U.S. Plastic Coatings Corporation

At the U.S. Plastic Coatings Corporation, we provide the expert solution to the application of baked-on plastic coatings using dip molding machines. We offer Plastisol, nylon, and vinyl coatings. We provide a wide variety of plastic parts through dip molding techniques.

Precision Dip Coating LLC

At Precision Dip Coating, precision is both our name and what we do! We have over 20 years of quality experience in the dip coating and dip molding industry, including experience in engineering, supply chain, and value-added services.

Carlisle Plastics Company

Carlisle Plastics is family owned and operated and has been serving many industries with high quality plastic dip coating and dip molding services since 1958. As an ISO 9001 certified company, we have earned our reputation as a trusted supplier of dip coating/molding services through the performance of our products.

Rubber & Plastic Company

Rubber & Plastic Company has the proven track record and years of experience you can trust for any plastic and rubber dip molding or coating need. We handle all of our processing on-site in our 25,000+ square feet of facilities.

View a full list of Plastic Dip Molding Manufacturers

Polyurethane Molding

Polyurethane is a very versatile material and can take many different forms. These materials exhibit many properties of rubber, plastic, and metal, but it typically lasts longer than plastics and is more resistant to impact than rubber. There are two main ways in which polyurethane is molded. Open casting involves pouring a mixture of liquid raw materials into a mold which is then cured to form the final product. Closed casting is similar except that the mixture is injected into a pressurized cavity. Depending on the raw materials used, polyurethane can be more elastic or more rigid for a variety of applications.

American Urethane, Inc.

A manufacturer of custom polyurethane molding, American Urethane serves a variety of industries, including chain conveyor equipment, material-handling, power tools, computers and medical.

Unicast Inc.

Unicast is a full-service polyurethane molding company and machine shop. They offer quality and long lasting engineered parts. Our casting machines ensure blending of standard urethane blends.

Argonics, Inc.

Elastomers provide a class of solutions to sticky design problems; polyurethane is a tough, durable and versatile elastomer suitable for difficult situations. Dissipating damaging impact or shock and protecting from wear and abrasion all require performance not available from rigid materials.

View a full list of Polyurethane Molding Manufacturers

Rotational Molding

Rotational plastic molding is capable of achieving plastic parts with more strength and structural complexity than any other plastic molding processes. Unlike other plastic molding methods, rotational molding produces a relatively low volume of parts in what are typically short runs, due to the amount of time and equipment required for rotational molding. Rotationally molded plastics may not be mass produced like blow molded, dip molded or thermoformed parts, and this process is typically reserved for complex or high-performance parts such as plastic figurines and military-spec rackmount carrying cases.

The rotational molding process is unique among plastic molding techniques. A molten polymer – often polyethylene or polycarbonate – is poured into a closed three dimensional mold; the mold is then placed within a gyroscope-like structure which slowly spins, evenly coating the entire interior of the mold with the polymer to form a hollow shape. This process is not only more effective at creating complex three dimensional structures, but it also creates parts with uniform material consistency and, consequently, very high strength.

Roto Dynamics Inc.

As a full-service rotational molding company, Roto Dynamics is your source for high quality, custom rotomolded products. Since our inception, we have continued to earn success by closely working with our customers, developing innovative and tailored solutions.

Sherman Roto Tank

We are a turnkey manufacturer of rotational molded tanks and basin. Our state of the art technology create precise, cost effective and dependable products. Whether your order is large or small, we want to be sure you are satisfied. We majority serve the Oil & Gas, Chemical, Agricultural, Marine industries.


Akro-Plastics is a rotational molding full service moldshop company focusing on rotationally molded plastics and other rotomolded containers. Our rotomolding produces consistent, high-quality products from simple to difficult. We also offer foam filling and CNC trimming and routing.

View a full list of Rotational Molding Manufacturers

Vacuum Forming

Vacuum formed plastics are used as faceplates and semi-flat components in a wide range of industries, particularly in electronic equipment such as fax machines, keyboards, phones and home appliances. Also known as thermoforming, or pressure forming, the vacuum forming process begins with stock plastic sheets rather than polymer resin pellets; these sheets are heated until the polymer reaches a flexible temperature, then they are vacuumed into an open mold, causing the heated sheets to “thermoform” to the exact shape of the die mold beneath. Twin sheet thermoforming is commonly used to create large and precision application parts such as hot tubs and interior wall panels for aerospace, but thermoforming is also a highly cost-effective means of producing three-dimensional plastic packaging. Blister packs, clamshells, plastic covers, plastic trays and other plastic packaging can be produced for low costs at high runs by vacuum forming.

Valk Industries, Inc

Valk Industries, Inc began in 1975 as a provider of engineering and fabrication services, and we have now expanded to produce and provide paper tubes and cores, custom thermoforming products, and various packaging services. Our company is run based on family values, and we are a second generation family owned corporation.

Conlet Plastics, Inc.

If you need a custom vacuum formed plastic product; Conlet Plastics is the place to turn! With over forty years of experience we are committed to providing customers with a great experience. Conlet Plastics is located in New Milford, Connecticut but is dedicated to serving customers wherever their services are needed.

Engineered Plastic Products, Inc.

We have been providing vacuum formed products for over forty years. We have had some big named clients over the years including NASA, Boeing, and USPS. We are committed to providing customer service excellence in many forms.

MARC, Inc.

Dedicated to cost effective pricing and quality assurance, MARC is the leader in both the contract sewing and packaging industries. We are ready to take on any packaging or sewing job you can throw at us, and customers from around the country are taking advantage of our InSourcing program.

View a full list of Vacuum Forming Manufacturers