Rotational moulding is used to create which type of objects?

• A. Small solid components.
• B. Large hollow plastic objects.
• C. Thin film packaging.
• D. Complex internal channels.

Answer: (B)

Rotational moulding builds hollow plastic items by coating the inside of a heated, rotating mould with plastic powder until it fuses into a single, seamless hollow shape. Because the mould is blown around in two directions while the material melts, the resulting objects have fairly uniform wall thickness and no parting lines, making it ideal for large hollow items like storage tanks, drums, or large containers. It isn’t typically used for making small solid components (those are better done with injection molding), nor is it the best choice for thin film packaging (that relies on extrusion or blown film processes to create very thin sheets). While some internal features can be included, rotational moulding isn’t the go-to method when products require very complex internal channels with precise geometry.