Solubility: Gypsum is reasonably soluble in h2o, with a solubility of about 2 grams for each liter at 25°C. Apparently, gypsum displays retrograde solubility, indicating its solubility decreases as water temperature improves – unlike most salts that become much more soluble in very hot h2o. Gypsum is considered non-poisonous, but https://www.propanraya.com/id/produk/eco-gypsum-ee-4050