Solubility: Gypsum Is moderately soluble in water, that has a solubility of about 2 grams for each liter at 25°C. Apparently, gypsum displays retrograde solubility, this means its solubility decreases as water temperature will increase – contrary to most salts that turn out to be extra soluble in hot water. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050