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