DESCRIPTION

Sodium Potassium Polyphosphates, Glassy occurs as colorless or white, transparent platelets, granules, or powder. It consists of several amorphous, water-soluble polyphosphates composed of linear chains of metaphosphate units (MPO₃)n for which M = Na and K and average chain length, n, is NLT 4. The material is usually identified by the M₂O/P₂O₅ ratio or the P₂O₅ content. The M₂O/P₂O₅ ratios vary from about 1.0 to 1.3. Its manufacture is based on an aqueous solution of phosphoric acid, potassium hydroxide, and sodium hydroxide or sodium carbonate that is heated to evaporate water and forms a high-temperature melt. This melt is then chilled to form a solid (amorphous glass), which is then milled and screened to obtain the appropriate granule size for use as a final product. Sodium Potassium Polyphosphates, Glassy is very soluble to freely soluble in water. The pH of a 1% aqueous solution ranges from 6.0 to 8.0.