Sodium Polyphosphate (CAS 68915-31-1) Sodium polyphosphate (CAS 68915-31-1) is a high-purity inorganic polymer composed of chains of phosphate units linked together, with sodium ions as counterions. This versatile chemical is widely recognized for its exceptional water-softening, sequestering, and dispersing properties. It serves as a key ingredient in numerous industrial and consumer applications due to its ability to bind metal ions, prevent scale formation, and enhance