Abstract: The composite material contains a metal layer on both sides of which is a plastic layer: the metal layer has a thickness of 8 to 80 .mu.m, the plastic layers each a thickness of 20 to 50 .mu.m; the plastic layers contain or comprise polyamide-based thermoplastics.

Abstract: Processes for manufacturing a metal-plastic composite foil having a plastic core covered on both sides with an outer layer of thin metal strip, in particular aluminum thin strip, are already known. However, the use of a so-called triplex composite of the kind just mentioned for relatively large volume containers of full weight up to about 30 kg has been very limited because of the unsatisfactory deep drawing properties of such composites in deep drawing or deep drawing by elongation of the foil (stretching). By means of the invention a process for manufacturing a metal-plastic composite of the so-called triplex composite kind and a metal-plastic composite foil made by this said process have been developed which allow in particular the manufacture of semi-rigid light-weight containers which have a weight of up to about 30 kg when full and this even by cold forming.