Abstract: Very light weight containers are made of synthetic resin reinforced by fiber material, such as glass fibers or carbon fibers, by first manufacturing a hollow dimensionally precise core having the shape of the container and including access openings at each end of the container. The composite material is then applied to the prefabricated core and after the setting of the composite material the core is either completely or partially removed by chemical means, which are pumped through the inside of the container to etch away the core, which is, for example, made of aluminum. A very controlled and precise core removal may be accomplished in this manner.

Abstract: Process for the production of a hollow body of revolution and/or container including the successive steps of forming a dish-shaped blank by a non-cutting shaping operation, forming a bottom portion and an adjoining tubular portion from the blank by a turning operation, and stretching at least the upper part of the bottom portion and the tubular portion to form a convex bottom and pipe portion respectively to form the thin walled body of revolution.