GRP stands for Glass Reinforced Plastic, which is more commonly known as “fibreglass”. It has a wider range of uses than GRG and so it is probably a more well known as a material. While GRG is mainly used to create sleek and durable building interiors, GRP is used in construction for roofing, canopies, and doors. GRC stands for Glassfibre Reinforced Concrete or GFRC (Glassfibre Reinforced Concrete) in America.
While GRG (Glass Reinforced Gypsum) is used for interiors, and GRP (Glass Reinforced Plastic) for its versatile uses, GRC is used for exterior building facade panels and as architectural precast concrete.