What Does Three-Layer Extruded Polyethylene Coating (3LPE) Mean? A three-layer extruded polyethylene coating (3LPE) consists of extruded, three-layer, anti-corrosive steel pipe coatings. The three layers in this kind of coating contain: Bonding agent or copolymer layerEpoxy layerPolypropylene or polyethylene layer Corrosionpedia Explains Three-Layer Extruded Polyethylene Read More