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Plastic Rotational Molding

A reliable source for Rotationally Molded Plastic information and leading Rotationally Molded Plastic Companies & Suppliers.

Hollow objects can be easily created using rotational molding, sometimes referred to as rotomolding, a plastic molding technique. While the most common thermoplastic material used for plastic rotational molding is polyethylene, other materials include polypropylene, polyvinylidene fluoride, nylon and polyvinyl chloride Although it uses a casting technique, it does not use pressure like the majority of other plastics manufacturing techniques. Read More…

Plastic Rotational Molding Plastic rotational molding is a thermoplastic fabrication technique that manufactures hollow products by using heat and a revolving metal mold. Rotomolded products are seamless, uniform in wall thickness and of single construction, which eliminates costly fabrication processes and the need for replacement parts.
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Leading Manufacturers

Orange, CA  |  877-768-6585

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. We are with you every step of the way, from design and development to production and assembly. For a complete view of our capabilities and services, check out our website, or submit a request for quote to see how we can serve you!

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Roto Dynamics Inc. $$$

Pearland, TX  |  281-648-0909

We are a custom manufacturer of rotationally molded products. Our state of the art technology creates precise, cost effective and dependable products. Whether your order is large or small, we want to be sure you are satisfied.

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Sherman Roto Tank $$$

Ootsburg, WI  |  620-221-9464

Western Industries, Inc. specializes in plastic rotational molding production of a wide range of parts and components. This company is capable of molding very intricate parts into an array of sizes, colors and textures. They are even able to provide the product with graphics and special finishes. For all your product needs, be sure to contact us for a quote today!

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Western Industries Plastic Products LLC $$$

Elberfeld, IN  |  800-304-4600

We provide outstanding custom plastic rotational molding. Our teams offer short lead times and we will assist you from concept to production. All of our materials and designs are FDA approved and we can handle the most complex projects. We are your one stop shop for all of your rotational molding needs. Give us a call today to learn more information!

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Fibertech Plastics $$$

Manitowoc, WI  |  920-645-0461

Trust Redline Plastics for all your plastics production needs. Rotational molding of parts up to 181 inches, vacuum/thermoforming of parts up to 120 in, and industrial cut-and-sew all under one roof! Our experienced team can handle your product development, engineering, and prototyping; provide quality on-time production of runs large or small; and value-add through assembly, packaging, and shipping.

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Redline Plastics $$$

Houston, TX  |  346-406-8158

Texas Rotomold is a superior manufacturer of rotationally molded plastics. With many years of experience, we can efficiently serve our customers at competitive prices. Our main focus has always been to provide our customers with high-quality products with the exact specifications for their needs.

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Texas Rotomold $$$

Brainerd, MN  |  218-824-2025

Revolv manufacturing specializes in the design and manufacturing of rotationally molded plastic. Since 1995, we have been producing high-quality rotationally molded plastic products. We offer our customers unrivaled customer service and high-quality products.

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Revolv Manufacturing $$$

Claremore, OK  |  346-406-8158

Need a custom rotationally molded plastic product? RotoMold USA produces items via rotational molding and performs product design, assists with mold manufacturing and mold maintenance, does quality testing and other services. We’ve done rotomolding for gas and oil, water recreation plus airline industries.

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RotoMold USA $$$
placeholder image Roto Dynamics Inc. Sherman Roto Tank Western Industries Plastic Products LLC Fibertech Plastics Redline Plastics Texas Rotomold Revolv Manufacturing RotoMold USA

Due to the fact that the method's molds do not need to bear pressure, they may be created relatively cheaply for short production runs. Numerous different goods are manufactured using rotomolding. The method gives the product designer a great deal of creative freedom because virtually any shape can be created. There are literally thousands of uses, and there are virtually no size restrictions on moldings.

rotational molded chicken coop

Plastic Rotomolding Process

The underlying principle of rotational molding is quite simple. A hollow mold that is normally made out of sheet steel or cast aluminum is filled with a plastic component, usually in powder form. Closed, the mold is slowly rotated on two axes. The polymer then progressively melts while being heated in an oven, "laying-up" on the inside of the rotating mold.

Once the polymer powder has melted fully, the mold is transferred to a cooling station and chilled, usually with air but occasionally with a fine mist of water. The portion solidifies as the mold cools. The process is stopped, and the result is removed from the mold. Once the material has finally cooled down enough, it is then loosened away from the mold surface.

The material cannot be regulated in the same way as high-pressure techniques like injection molding because it is a casting process and there is typically no pressure involved. Numerous factors, including ambient temperature and humidity, type of mold, material specifications, and powder quality, can have an impact on production and the final product.

basic rotational molding process

Materials Used in Plastic Rotomolding

  • More than 80% of the polymers used in industries that use rotational molding are made of polyethylene. This is because it is inexpensive and simple to mold. In contrast to non-polyethylene polymers, which are difficult to ground, it is easily accessible in powder form. Additionally, it has low water absorption and strong chemical resistance.
  • Low-Density Polyethylene (LDPE), Medium-Density Polyethylene (MDPE), and Polypropylene. One of the most adaptable polymers on the market, polypropylene is the second most processed plastic. It shares traits with both LDPE and MDPE. Its favorable characteristics include good fatigue, heat, and chemical resistance.
  • Vinyl chloride monomer is a polymer of a substance called polyvinyl chloride. It is a robust and rigid plastic that can have a wide range of additives added to change its mechanical characteristics.

Advantages of Rotomolding

  • Rotational molding is a highly-efficient molding technique that enables producers to build incredibly durable items with the fewest possible design restrictions as well as to produce them at comparably cheap costs and in an ecologically friendly way. Furthermore, it is simple to manufacture huge things economically and with minimum material waste.
  • Rotational molding can quickly be set up, enabling small batch production to satisfy fluctuating demand. In general, it is relatively inexpensive compared to fabrication, fiberglass, injection, vacuum, or blow molding procedures since it helps to reduce stock holding and probable redundancy of stock.
  • Another one of rotational molding's key advantages is its adaptability. It makes it possible to produce items with several layers, a range of styles, colors, and surface finishes with none of the polymer weld lines. To meet the stringent design and engineering requirements, rotomolding can handle not just inserts but also logos, recesses, spouts, bosses, and many other characteristics. Additionally, employing this technique allows for many product types to be combined on a single machine.

Applications of Plastic Rotomolding

  • Carboys, gallon barrels, and plastic storage tanks for holding tiny to extremely large volumes of water and chemicals
  • Syringes, oxygen masks, and squeeze bulbs are examples of laboratory and medical supplies
  • Rotational molding is the only method of manufacturing material handling equipment such as sturdy crates, stackable pallets, containers, and insulated boxes.
  • Planting-related gardening and agricultural equipment, such as pots, troughs, compost bins, and gardening carts
  • Sanitary items like garbage cans, trash containers, and septic tanks
  • Rock and roll molding machines are used to create rowing boats, canoes, buoys, and kayaks, among other marine vehicles and equipment for transportation and water activities.
  • On roads and highways, you can see safety barricades, traffic cones, and other such objects.
storage box

Plastic Rotational Molding Informational Video


Rotational Molding Power Pages

Rotational Molding

Blow Molding

Rotational molding, commonly referred to as "rotomolding", is a plastic casting technique used to produce large hollow, seamless, and double-walled parts. It is a three-stage process that involves a mold on a rotating frame, a heating chamber, and a cooling chamber. Molds for the rotomolding process are specially designed....

Blow Molding

Blow Molding

Blow molding is a type of plastic forming process for creating hollow plastic products made from thermoplastic materials. The process involves heating and inflating a plastic tube known as a parison or preform. The parison is placed between two dies that contain the desired shape of the product...

Compression Molding

Compression Molding

Molding is a manufacturing process that uses a mold - the latter being a solid container used to give shape to a piece of material. It is a forming process. The form is transferred from the mold to the material by...

Plastic Molding Processes
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