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. These layers in this kind of coating consist of:

Bonding agent or copolymer layer
Epoxy layer
Polypropylene or polyethylene layer

Corrosionpedia Explains Three-Layer Extruded Polyethylene Coating (3LPE)

A three-layer extruded polyethylene coating is utilized for several forms of pipelines including sewer systems, water pipelines, gas pipelines and other channels which can be dangerous to water. Polyethylene coatings come in use to protect buried pipelines from corroding considering that the 1950s. This sort of coating provides higher capacity insulation than bitumen coatings.

A three-layer extruded polyethylene coating does apply through sight extrusion and sleeve extrusion. Those two types of applying polyethylene coating were introduced in the 1960s, replacing the sintering technique. It had been from the 1980s when 3LPE became very prevalent in the marketplace.

One good thing about this coating material is that it is ultra-adhesive, even at 70 degrees. Also, it may be easily cut back as necessary by having the pipelines heated. Furthermore, this material has a very strong chemical resistance which make it applicable even just in one of the most aggressive environments, including all forms of soil.

Caffeine resistance of this coating prevents its corrosion. However, it ought to be noted which simply like many materials, it is usually susceptible to some kinds of corrosion. Due to this, as early as 1974, testing has become forced to determine the fermentation or corrosion resistance of 3LPE. This really is conducted by measuring the temperature by using a thermometer at 140°F (60°C). The measure of aging may be the melt index, that’s set with an initial value of 25%. Over the years, heightened testing methods have been created to determine the 3LPE’s aging and resistance to corrosion.

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