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Pultrusion is a manufacturing process for converting reinforced fibers and liquid resin into a fiber-reinforced plastic, also known as fiber-reinforced polymer (FRP). The pultrusion process allows continuous production of FRP structural shapes in an automated, energy-efficient process by pulling fiberglass rovings through a resin bath or resin impregnator that completely saturate the reinforcements. The resin hardens from the heated steel pultrusion die, resulting in a strong, lightweight final product that follows the shape of the die.GRP is used for ballast water pipes, but GRE is used in seawater pipelines. These two kinds of pipes are used more and more, but what is the difference between the specific applications?
As technology evolves, many industries require specific parts with properties that can't be matched by traditional materials (e.g., steel, aluminum, wood.) Many verticals need options that are both durable and lightweight to meet fast-evolving and unique requirements.This manufacturing process converts reinforced fibers and liquid resin into a fiber-reinforced plastic using a pulling method, as opposed to a pushing method used in an extrusion process.
The first step in the pultrusion process is to saturate the fibers by pulling them through a resin impregnator containing a bath made of epoxy, polyurethane, polyester, and/or vinyl ester.1. Corrosion resistance
FRP pipes inherit resistance to corrosion. In most cases, Fiberglass Reinforced Plastics are the only material that can handle some service environment. Moreover, their resistance to corrosion is normally combined with their cost advantage to make them the most acceptable solution. Corrosion resistance of Fiberglass Reinforced Plastic pipes is a function of the total resin content and the resin used in the pipe laminate. Therefore, higher resin content means more resistance to corrosion.