Aspart modified proinsulin sequences that have a modified C-peptide amino acid andor nucleic acid modification for producing aspart insulin analogs are provided. The laminate has two facing metal layers that are structurally bonded to a polyurethane elastomer core which may have steel or rigid foam void sections embedded within. As an alternative, or in addition, to this, the cross section of the web attachments is increased, which also increases the rate of the luminous-flux run-up.