Solubility: Gypsum is moderately soluble in water, which has a solubility of about two grams per liter at 25°C. Apparently, gypsum reveals retrograde solubility, this means its solubility decreases as drinking water temperature improves – contrary to most salts that turn out to be additional soluble in scorching drinking water. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050