Material and structure: cross-link PE/XPE surface + middle white PEF layer + inside EPE layer, main type PE+PEF+EPE, generally called cross-link compound PE insulation pipe. The colour of inside EPE layer can be pink, black, blue, grey... Mainly for ACR and REF copper tubes or drain pipe, also for some water, gas or solar piping, etc. The surface can be printed.
