Glassfiber Reinforced Concrete Glassfiber Reinforced Concrete (GRC) was introduced by GEL in 1979 on license from Pilkinton Brothers Ltd. of England. Since then GRC has been one of GEL's most successful products, adorning many of Bangkok's most recognized building including the Wall Street Tower, Peninsular Plaza, Amarin Plaza and the New Grand Hyatt Erawan Hotel. GRC is a unique mixture of cement and sand reinforced with a special glassfiber, creating a thin but strong material which may be easily formed into a wide variety of ornamental shapes. The light weight GRC are easily transported and put in place.