1.Corrosion resistance, both of the external wall and internalwall in contact with the conveyed fluid. No protections such ascoating, painting or cathodic are nedeed. GRP pipes are resistantto nearly all chemicals even at much higher temperatures (up to 170°C) than other plastic materials.
2.Smoothness of the internal wall that minimizes the head lossesand avoids the formation of deposits on the other hand minimizesthe slope.