White crystals or powder, odorless or has a faint odor of propionic acid. Can not be metamorphosed at hight temperaturer, anhydrous or has one molecule of water of hydration. Soluble in water , not soluble in alcohol. Deliquescence will happen when exposed in air . Its water solution is slightly alkaline , PH of 10% water solution is 7.4. 39.8g calcium propionate dissolves in about 100ml of water at 20℃