Sodium Tripolyphosphate STPP
Sodium tripolyphosphate white granular or powder, an apparent density of 0.35-0.90g / cm3, melting point 622 ℃. Water-soluble, alkaline aqueous solution, 1% aqueous solution PH 9.7. In the water gradually hydrolyzed to phosphite, has a good ability to complex metal ions. With calcium, magnesium, iron and other metal ions to form soluble complexes. You can soften hard water. As an inorganic surfactants, organic surfactants having certain properties.