Glass reinforced plastic (CTP) is a composite material obtained by combining glass fiber with a
carrier matrix resin. Fiberglass reinforced plastic is a high quality composite engineering material
obtained by combining flexible, but not sufficient mechanical strength plastic (eg polyester resin)
with high mechanical strength glass fiber.
The GRP material has two main raw materials: unsaturated polyester resin and glass fiber.
The most commonly used unsaturated polyester resins in GRP production are thermoset resins in
reinforced plastics. It addresses all kinds of molding techniques, from simple molding techniques
such as hand laying to the most complex mechanized molding techniques. Polyester resins cover a
wide range of chemical families and are generally obtained by the condensation reaction of polyhydric
alcohols with dibasic acids. Depending on the type of dibasic acid used, unsaturated polyester
resins are referred to as “orthophthalic”, “isophthalic” or “bisphenolic” so as to ensure that the
composite is of general purpose, chemical resistance or high chemical resistance.