Rotationally Molded Plastics banner

Plastic Rotational Molding

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

While the most common thermoplastic material used for plastic rotational molding is polyethylene, other materials include polypropylene, polyvinylidene fluoride, nylon and polyvinyl chloride. 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.
Request for Quote

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!

Request A Quote

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.

Request A Quote

Sherman Roto Tank $$$

Ootsburg, WI  |  920-564-3633

In business since 1967, Dutchland is one of the top 5 manufacturers of custom rotational molded plastic products in North America. Whether it’s the size of your plastic product or the need to scale your production quickly, Dutchland gives your company the ability to Go BIG.

Request A Quote

Dutchland $$$

Rochester, IN  |  800-633-9173

RRM is a manufacturer of Rotationally Molded products, as well as a custom mold builder. Recently we have focused on advanced and innovative designs for our own proprietary products as well as for our custom products. These solutions are developed in order to add quality, value, and integrity to the products that we produce. RRM has been involved in the process of rotational molding since1988.

Request A Quote

Rochester Rotational Molding, Inc. $$$

Fountain, CO  |  719-382-9300

RMB Products offers custom plastic fabrication using thermoplastics. We perform the plastic machining as well. Some of the plastic parts we have produced include hydraulic reservoirs, pressure dispense vessels, sump tanks, process vessels and plastic tanks.

Request A Quote

RMB Products $$$
placeholder image Roto Dynamics Inc. Sherman Roto Tank Dutchland Rochester Rotational Molding, Inc. RMB Products

These plastics are exposed to high heat and therefore must exhibit good thermal stability. To enhance properties like flame retardancy, water and chemical resistance as well as the ability to withstand extreme temperatures, many resin powders contain additives, which can also alter the color, texture, finish and appearance of the cured plastic's surface.

Plastic rotational molding is an alternative to blow molding, injection molding and thermoforming, but is not as common because of the large, expensive machinery that is used to form the products. Still, this molding process is used within the sporting goods, waste water management, marine, pharmaceutical, construction, toy manufacturing, food and beverage processing, chemical, plumbing, agricultural, furniture, packaging and material handling industries, among others.

Rotomolded products include safety cones, plastic tanks, footballs, helmets, kayaks, playground slides, pipe fittings and outdoor planters.

The plastic rotational molding process starts with mold fabrication via welding, for simpler designs, or die casting, for more complex constructions. The molds are made of stainless steel, aluminum or a combination of both, when wall thickness is not intended to be uniform.

The plastic rotational molding machine is composed of a series of different molds, which are mounted on rotating spindles, which revolve on one or two axes. The polymer resin powder, which must be very fine in order to coat all areas of the mold, is then poured. The plastic rotational molding machines are then transported to an oven chamber while they continuously revolve.

Once under high heat, the powder melts and evenly covers the mold walls. Next, it travels to a cooling chamber, which uses a combination of cold water and air to cure the plastic. This takes about 20 minutes. Once the plastic has fully dried, the molds are manually unloaded, which can be difficult if the plastic shrinks.

Right out of the mold, rotomoulded products are hollow parts without any openings or holes; they must be cut out if needed. The plastic is often cleaned, polished, painted or welded with small components as final post-forming fabrications.

Plastic Rotational Molding Informational Video

 
Plastic Molding Processes
Featured Industries