The rotational moulding process is relatively simple, consisting of loading the mould cavity with powdered polymer, heating the mould to around 300°C whilst rotating it on two axes to evenly distribute the polymer and finally cooling the mould to extract the product. Rotomoulding is a medium-volume process suitable for manufacturing complex parts of up to 100 per week from a single tool.
The moulds are made from either steel, cast aluminium or CNC machined aluminium and are relatively low in cost when compared to moulds for other processes such as blow or injection moulding.
The surface finish and colour of rotomoulded parts can be tailored to suit the product requirements. Metal inserts and integrally moulded-in threads can also provide significant opportunities for cost down. Often this process is used to replace complex metal parts and fabrications with single piece mouldings. Graphics, logos and text can be moulded into the product in any combination of colours. Being permanently embedded in the polymer, they will not deteriorate with age and cannot be removed chemically.