Gypsum can be a soft sulfate mineral made up of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O.[4] It really is widely mined and is made use of for a fertilizer and because the key constituent in several sorts of plaster, drywall and blackboard or sidewalk chalk. If you plan https://www.propanraya.com/id/produk/eco-gypsum-ee-4050