Calcium lignosulfonate (Abbreviation:calcium wood) is a multi-component polymer anionic surfactant. Its appearance is light yellow to dark brown powder with a slight aromatic odor. The molecular weight is generally between 800 and 10,000. Strong dispersibility, adhesion and chelating properties. Usually comes from the cooking waste liquid of acid pulping (or called sulfite pulping), which is made by spray drying. Can contain up to 30% reducing sugars. It is soluble in water, but insoluble in any common organic solvents.