They are known for their impact resistance, high tensile strength and wide design range. Rotational molding is an inexpensive process that uses rotation, heat and a mold to form many different products, the most popular of which are plastic tanks. Read More…
Leading Manufacturers
Roto Dynamics Inc.
Orange, CA | 877-768-6585As 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!
Sherman Roto Tank
Pearland, TX | 281-648-0909We 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.
Fibertech, Inc.
Elberfeld, IN | 800-304-4600We 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.
Sterling Technologies, Inc.
Lake City, PA | 814-774-2500Sterling Technologies manufactures a diversity of rotational molded products. Our affordable components are strong, durable, and have a high impact tolerance. We serve a multitude of industries such as warehouse, produce & food processing, paper, electronics, aerospace, and many more. Contact us today and tell us what we can do for you!
ASH Industries
Lafayette, LA | 800-598-2774ASH Industries is a manufacturer of injection molded plastic components and a producer of molds. We process a vast selection of injection moldable materials; vinyl and vinyl ester, thermoplastic elastomers, styrenics, polymide, polyolefins, phenolic and liquid crystal polymers.
Rotomolded Tanks - Sterling Technologies, Inc.Rotomolded tanks exhibit uniform wall thickness, the ability to have threads, fittings or hardware attached and many different color options. They are mostly used in industrial applications for the food and beverage processing, fuel and oil, chemical, pharmaceutical, marine, wastewater treatment, agricultural and medical industries.
Their seamless, single part construction protects against fractures and leaks, which leads to a longer lifespan. They have many benefits over metal tanks, which can corrode and oxidize and are difficult to install. Rotational molding is also the most beneficial method of producing plastic tanks, compared to other thermoplastic fabrication processes like welding.
There is also very little material wasted, unlike thermoforming, injection molding and blow molding, all of which have extra scrap pieces of plastic that are removed from the newly formed tanks and require costly assembly. Rotationally molded tanks are made of a few different thermoplastic materials, including polyethylene, polypropylene, Halar and polyvinylidene fluoride, all of which are high purity plastics. To enhance properties like strength, moisture, chemical and temperature resistance, color and flame retardancy, the plastic resin often contains additive materials, depending on the product's application.
Since plastic tanks are generally some of the largest products fabricated from rotational molding, manufacturers employ the largest rotomolders to produce them. They require a large amount of space, an area where high heat can be reached and a cooling location, both of which must be big enough for the rotational molding machine to revolve around two different axes if necessary.
To fabricate the tanks, the polymer resin is always in fine powder form, in order to better reach all corners and sides of the tank-shaped mold. Since the process is carried out under low speeds and low pressure, even distribution of the plastic is sometimes a concern. However, if the plastic granules are fine enough, complex designs such as two-compartment tanks are possible. Rotomolded tanks are designed to be either horizontal or vertical in orientation, and may hold anywhere from a few gallons to several thousand gallons.