食品添加剂六偏磷酸钠（SHMP）

White powder, granules or flakes, total phosphate (as P₂O₅) ≥68.0%, iron ≤0.01%, pH 5.8–6.5, degree of polymerisation 9–21, to GB1890-2005. Iron can be held below 30 ppm; used as quality improver, pH regulator and metal-ion sequestrant; 25 kg bags.