These pseudo crosslinks, however, disappear under the effect of heat, and thus the classical extrusion, injection moulding and calendering processing methods are applicable to these materials.
Many process methods such as extrusion and injection moulding involve pumping molten polymer into tools, and the high temperatures needed for melting may result in oxidation unless precautions are taken.
In the early 1950s, as with many manufacturers, the company abandoned the use of lithographed tinplate for trains in favor of plastic injection moulding.
