Since 1998, carbonate series has become the main item of Yixin. This product is made of barium carbonate, potassium carbonate, and strontium carbonate. Barium carbonate (BaCO3), also known as witherite, is a kind of chemical compound used in rat poison, bricks, ceramic glazes, and cement.

Barium carbonate is widely used in the ceramics industry as an ingredient in glazes. It acts as a flux, a matting, and crystallizing agent and combines with certain coloring oxides to produce unique colors not easily attainable by other means.

In the brick, tile, earthenware and pottery industries, barium carbonate is added to clays to precipitate soluble salts (calcium sulfate and magnesium sulfate) that cause efflorescence.

Potassium carbonate is the inorganic compound with the formula K2CO3. It is a kind of white salt, which is soluble in water. It is deliquescent, often appearing a damp or wet solid. Potassium carbonate is mainly used in the production of soap and glass.

Strontium carbonate is widely used in the ceramics industry as an ingredient in glazes. It acts as a flux and also modifies the color of certain metallic oxides. It has some properties similar to barium carbonate.