Gypsum is actually a gentle sulfate mineral composed of calcium sulfate dihydrate, Together with the chemical formulation CaSO4·2H2O.[4] It is broadly mined and is utilised like a fertilizer and as the main constituent in several types of plaster, drywall and blackboard or sidewalk chalk. Gypsum is taken into account non-toxic, https://www.propanraya.com/id/produk/eco-gypsum-ee-4050