Solubility: Gypsum is reasonably soluble in drinking water, which has a solubility of about 2 grams for every liter at 25°C. Apparently, gypsum exhibits retrograde solubility, which means its solubility decreases as water temperature boosts – not like most salts that turn out to be more soluble in hot water. https://www.propanraya.com/id/produk/eco-gypsum-ee-4050