Glass-reinforced plastic (GRP), commonly referred to as fibreglass, is a material mainly used for reinforcements, coverings, insulators, structures and enclosures.
Fibreglass is a lightweight and rigid material made typically with epoxy, vinylester or polyester thermosetting plastic, as well as fibres of glass that act as a type of reinforcement.
In the manufacture of a fibreglass part, fibres of glass (usually in sheet form) are layered over a mould (called a buck or plug) in the shape of the final product and then plastic is applied to the fibres. It is possible to add more layers to increase the thickness and thus, the strength of the final product.
Fibreglass is mostly used for small series or one-off productions, within industries as diverse as marine and motorsport.