Yuanmingfen, chemically known as anhydrous sodium sulfate, is an important inorganic chemical raw material with the chemical formula Na2SO4 and a molecular weight of 142.04. This product is generally a white, odorless, bitter-tasting crystal or powder with extremely strong hygroscopicity. When exposed to air, it easily absorbs moisture and converts into decahydrate sodium sulfate, which is commonly known as mirabilite.