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Fibreglass Reinforced plastic (FRP), popularly known as fibreglass, was discovered during the second world war, FRP has virtually revolutionized the composite materials of the 20th century.
A composite material is an anisotropic, heterogeneous medium, made by combining two or more materials with differing properties. Properties of the composite are different from those of the constituent materials.
The components of the composite do no merge completely in to each other and can be physically identified along with the interface between them. The properties of the interface also contribute to the properties of the composite.
Present day engineering material must combine good Mechanical, Chemical, Electrical and Thermal properties a part from having good aesthetic characteristics. Several of these properties are expected in a single material and for a long time metals were regarded as the only suitable materials when required. The need for composites arose when marked increase in performance of metals could no longer be achieved at reasonable developmental cost.
Fibre Glass Reinforced plastic (popularly known as FRP / GRP) are made by combining a high strength, high modulus glass fibre reinforcement with a relatively low strength, low modulus resin matrix so that optimum stiffness in shear and compression is obtained.