Gypsum is usually a comfortable sulfate mineral composed of calcium sulfate dihydrate, Along with the chemical formula CaSO4·2H2O.[4] It is commonly mined and it is made use of to be a fertilizer and as the principal constituent in many forms of plaster, drywall and blackboard or sidewalk chalk. You should https://www.propanraya.com/id/produk/eco-gypsum-ee-4050