Sodium tripolyphosphate (STPP): A kind of organic chelating agent with the function of chelating the metal ion in a detergent solution. It can also soften the water and prevent the powder from agglomeration.
Sulphur: Industrial sulfur is yellow or light yellow, with lumps, powder, granules or fakes, etc. It is most stable below 95.5℃, density 2.1g/cm3, melting point 112.8℃, boiling point 445℃.