3LPP Coating Line Three Layer Polypropylene DN219-1720 mm
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3LPP Coating Line Three Layer Polypropylene DN219-1720 mm Overview Polypropylene enters the picture when service temperature rules polyethylene out. A three-layer polyethylene coating performs well across most buried pipeline duty, but once operating temperature climbs above the polyethylene ceiling the topcoat softens, the bond to the adhesive degrades and the coating stops behaving as a system. Three-layer polypropylene replaces the topcoat with PP and moves the whole