Especially good, after merging, relative hardening of the second region by {TAIL ~ the irradiation} can be achieved if from about 5 to {HEAD ~ about 70 weight percent} of at least one substance that can be crosslinked or polymerized by ionizing radiation is uniformly incorporated into the PVC material for the second region and the irradiation provides such ionizing radiation 
Especially good , after merging , relative hardening of the second region by { TAIL ~ the irradiation } can be achieved if from about 5 to { HEAD ~ about 70 weight percent } of at least one substance that can be crosslinked or polymerized by ionizing radiation is uniformly incorporated into the PVC material for the second region and the irradiation provides such ionizing radiation
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