Corrugated, smooth interior, high density polyethylene (HDPE) pipe Smooth interior wall, corrugated exterior, superior corrosion and abrasion resistance. N 12 pipe is available in soil tight (ST), watertight (WT) and plain end, all of which offer joint options of bell and spigot design, gasket, bell wrap or pressure rated 10.8 psi couple.[price]Polyethylene under HS Code 39173999 Import Shipment [hdpe]Few Sample Shipment Records of Polyethylene under HS code 39173999 imports in vietnam are given above. For more details of vietnam customs data of Polyethylene under HS code 39173999 or any other product kindly contact [email protected] or Call +91 11 47048012[price]What's the difference between LDPE, LLDPE, MDPE, HDPE [hdpe]HDPE (High Density Polyethylene) has minimal branching of its polymer chains. Because it is denser it is more rigid and less permeable then the LDPE. It has a density of 0.941 0.965g/cm 3. XLPE (Crosslinked Polyethylene) is high density polyethylene which has covalent bonds between connecting its polymer chains. These bonds are caused by