Plastic Molding 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:

Blow Molding

Blow molded plastics can be produced at extremely high rates, with optimal performance on long runs. This cost-effective process combines extrusion and thermoforming techniques to produce a wide range of hollow plastic bottles, containers, parts and toys for the consumer and packaging industries. Blow molding machines plasticize and heat plastic resin – typically high or low density polyethylene (LDPE or HDPE) – through an extruding barrel, at the end of which the molten plastic is pushed around a conical mandrel, forming an open, tube-shaped “parison”. The parison is then clamped between two open dies and blown into the three dimensional cavity, causing the plastic resin to stretch and take on the shape of the mold cavity.

R&D Molders, Inc.

R&D Molders, Inc. is an industry leader in custom injection and blow molding. We are a family owned and operated company located in Georgetown, Texas just 20 minutes north of Austin. We have been loyally serving customers since 1974.

Custom-Pak, Inc.

Since 1974, our company has proven itself to be the industry leader in the production of blow molded parts as well as the most efficient blow molding equipment available on the market today. Custom-Pak, Inc. is a global force with 6 blow molding facilities in North America.

Penguin, LLC

We are Penguin LLC, and we are a fully integrated supplier of custom blow molding, metal fabrication, injection molded plastics, power coating, and many other services. We offer the distribution of all these products.

W.R. Kershaw Inc.

W.R. Kershaw is an industry leader in the production of blow molded polycarbonate light globes and custom blow molded plastics. Lighting fixtures, plastic bottles and more, W. R. Kershaw provides assistance from initial concept to finished product.

View a full list of Blow Molding Manufacturers

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 Dip Molding Manufacturers

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.

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.

Augusta Fiberglass

Our fiberglass items are a great alternative to metal. These products are not only flexible and lightweight but also very durable. Turn to us for your fiberglass fabrication needs. Our engineers can create fiberglass protective coverings, machine housings and more.

View a full list of Fiberglass Fabricator Manufacturers

Injection Molding

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 who continuously invests in the best equipment to create the most creative rubber innovations.

Xcentric Mold & Engineering, Inc.

Getting the Custom Parts Your Projects Need Has Never Been Easier! Quick-turn, low-cost manufacturing solutions for all of your projects, no matter the quantity, no matter the complexity. Our unique process allows us to do what they do, and do what they won't!


ICOMold manufactures low-cost, high-quality custom plastic injection molds and parts, and CNC machined prototype parts. U.S.-based sales engineers and China manufacturing gives you the best of both worlds - we're easy to work with, yet have very low costs.

View a full list of Injection Molding 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. And we really are "Preferred," as is proven by the fact that we are continually named "Supplier of the Year" by our clients.

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. Our plastic items are engineered for uncompromising performance and long-lasting operation.

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 and we supply various extrusion solutions.

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, tubing, coated wire and cable for a wide range of industries.

View a full list of Plastic Extrusion 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.

Sterling Technologies, Inc.

At Sterling Technologies, we pride ourselves on providing excellent products that stand out in a crowded marketplace, all while maintaining our reputation of outstanding customer service.

Trilogy Plastics, Inc.

For over 50 years, Trilogy Plastics has specialized in rotationally molded plastics and other forms of rotational molding. Let our experienced staff of rotomolders create a plastic part solution for you.

Fibertech, Inc.

Fibertech is one of the industry's leading, customer-driven plastic rotational molding companies. William Scott founded our company on his deep understanding of the plastic container industry which he gained during his time spent repairing damaged containers.

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.

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.

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