Solubility: Gypsum Is moderately soluble in drinking water, with a solubility of about two grams for every liter at 25°C. Interestingly, gypsum exhibits retrograde solubility, which means its solubility decreases as water temperature increases – not like most salts that grow to be additional soluble in very hot drinking water. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050