A hollow part can be made in one piece with no weld lines or joints

The end product is essentially stress-free

The moulds are relatively inexpensive

The lead time for the manufacture of a mould is relatively short

Short production can be economically viable

There is no material wastage in that all of the material is normally consumed in making the part

It is possible to make multilayer products

Different types of product can be moulded together on the one machine

Inserts are relatively easy to mould in