In particular, technical consideration is being given to the use of s-XLPE (XLPE cross-linked with silanes) insulation, with expanded skin and bio-colours, for buildings, in order to replace the standard insulation using fully coloured s-XLPE; the use of polypropylene (PP) insulation with coloured skin for construction cables, in order to replace the standard insulation using fully coloured s-XLPE, and the use of biological plasticizers for PVC compounds.