Green-fom G.R.G stands for Glass Reinforced Gypsum. It is a simple idea to introduce strands or mats of glass fiber into otherwise brittle plaster elements to give them structural strength. Besides, it is a non-toxic and in-flammable material. What this can mean to your project is that the plasterer is now free to prefabricate elements in large, structurally stale sections for quick installation and simple attachments.