Gypsum is often a gentle sulfate mineral composed of calcium sulfate dihydrate, Along with the chemical system CaSO4·2H2O.[4] It is commonly mined which is made use of as being a fertilizer and because the main constituent in many forms of plaster, drywall and blackboard or sidewalk chalk. Wall Coating: Gypsum https://www.propanraya.com/id/produk/eco-gypsum-ee-4050