PASP is a water-soluble polymer and a novel, eco-friendly water treatment agent characterized by being phosphorus-free, non-toxic, pollution-free, and fully biodegradable. CAS No.: 181828-06-8; 35608-40-6 Molecular Formula: C4H5NO3M(C4H4NO3M)m(C4H4NO3M)nC4H4NO3M2 Relative Molecular Mass: 1000-5000 It possesses strong ion-chelating capabilities and offers dual functionality in corrosion inhibition and scale inhibition; it effectively inhibits the formation of scale-forming salts such as calcium carbonate, calcium sulfate, barium sulfate, and calcium phosphate, achieving an inhibition rate of up to 100% for calcium carbonate. Additionally, PASP acts as a dispersant and effectively prevents corrosion in metal equipment.