Gypsum is actually a comfortable sulfate mineral composed of calcium sulfate dihydrate, with the chemical system CaSO4·2H2O.[4] It truly is broadly mined and is particularly used as being a fertilizer and as the main constituent in several types of plaster, drywall and blackboard or sidewalk chalk. Gypsum is considered non-poisonous, https://www.propanraya.com/id/produk/eco-gypsum-ee-4050