Rotational Molding Powders Built for Performance, Flexibility, and Scale Rotational molding – also known as rotomolding or rotational casting – is one of the fastest-growing methods for manufacturing hollow plastic products. And it’s easy to see why. With the ability to create open or closed shapes in virtually any size or form, rotomolding is both flexible and cost-effective. Thanks to ongoing innovation and materials like Microthene polyolefin powders, the process has evolved dramatically. Today, rotomolding can match or even outperform traditional methods like blow molding, injection molding, and thermoforming—especially when it comes to producing large, complex, or seamless parts that other processes can’t easily replicate.