Now, one of the key steps that often has a major influence on cost is the tooling stage. Since plastic products created using injection moulding are generally smaller and more intricate than those created by rotomoulding, there is naturally a higher investment of time and labour involved in creating them, which can ultimately increase the cost. What’s more, since there is often a smaller size limit on the sort of parts that can be created by injection moulding, this means that several separate tools might need to be manufactured in order to produce all the parts used to make the larger final product.

Most injection moulds are machined from high-grade steel and the cavity of each tool is machined, ground and polished to extremely tight tolerances. In other words, the manufacturing process is much more exacting as the tools are machined to incredibly precise definitions, and naturally this more intensive process again results in an associated rise in cost.