Rotational Molding

Shape pieces with rotational molding to optimize your business needs
By Meredith McGhan Rotational molding, also called roto molding, shapes one-piece, hollow plastic parts at low pressure but high temperatures for industrial applications. Roto molders use rotation on two axes. Typically, rotational molding takes longer than other molding types such as injection molding. You use rotational molding to make items of nearly any size from syringe bulbs to oil tanks.

Rotational molding may take a little longer, but it has some advantages over other types of molding. Most importantly, it is less expensive than other molding processes. It's also more efficient because you can re-use the small amounts of excess material rotational molding creates. Generally, you use rotational molding for products made from materials like PVC plastisol, polyethylene and nylon.

1. Find rotational molding manufacturers who make rotational molds for the specific materials your industry uses.

2. Look for rotational molding manufacturers who do custom rotational molding jobs to your specifications, from start to finish.

3. Order jobs from rotational molding suppliers who specialize in the kind of finished products you need.

Buy rotational moldings made from specific materials

Whether you need a specific type of polymer, nylon, composite or other material to make your product, look for industrial rotational molding companies that specialize in that type of material. They generally have more industry specific experience than a company specializing in a variety of materials.
Try:  Hedstrom Plastics uses polymers, nylon, PVC, urethane and more. It will work with you from prototyping to final production. Albert International specializes in plastisol PVC products, and it offers customized service that walks you through the entire production process.

Purchase rotational moldings from manufacturers who specialize in custom jobs

If you have a unique product, especially if it's in the prototype stage, you'll need to find a rotational molding manufacturer who can be your partner in production from design to the time when the last product comes off the line.
Try:  Integrity Rotational Molding works with inventors and designers to customize all your rotational molding needs from start to finish. Anduran offers complete customized service starting at any point in the process for the rotational molding needs of most industries.

Find rotational molding distributors that make the items you need

If you need a certain type of product, whether it's plastic syringes for the medical industry, hollow plastic children's toys or automotive components, there's probably a company that makes it. Shop around and see whether you can find a manufacturer of the product you need.
Try:  Johnson Plastics makes urns for cremation ashes and parts for display mannequins, among other products. Jalor makes hollow plastic handles, tanks and jugs.

• Check out exhibitions and trade shows where rotational molding companies present their products. Trade shows for the plastics industry also make a great place to network.