Sodium Hexametaphosphate
Graham's Salt, SHMP
- CAS
- 10124-56-8
- EC
- 233-343-1
- Food Code
- E452
- Sectors
- Water & Wastewater Treatment, Food & Nutrition
Sodium Hexametaphosphate (SHMP), also known as Graham's salt, is a white powder or colorless glassy solid with the formula (NaPO3)6 and a molecular weight of 611.77 g/mol. Available in Food Grade and Technical Grade, it is highly hygroscopic and readily soluble in water, forming a clear solution with a pH of 5.8-7.3 at 1%.
SHMP is a powerful sequestrant, forming stable complexes with calcium and magnesium ions. In food processing (E 452i) it acts as an emulsifier, texturizer, and moisture retainer in processed meats, seafood, dairy products, and beverages.
Technical applications include water treatment for scale and corrosion inhibition, deflocculation in ceramics, drilling fluids, and detergent formulations. It is produced by thermal condensation of sodium metaphosphate and consists of a mixture of polymeric metaphosphates.
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Sodium Hexametaphosphate
Applications
Widely used in water treatment as a scale inhibitor in EDI, RO, and NF systems. In the food industry, it improves water retention in meats, prevents oxidation, and enhances texture in soy products. Also applied in detergents, ceramics as a dispersant, paints, and metal finishing.
Safety & Risks
Generally safe but can irritate eyes, skin, and respiratory tract. Avoid strong acids or oxidizers to prevent heat or decomposition. Use PPE and ventilate areas. Not hazardous for transport; store dry to avoid moisture.
Packaging
Typically in 25kg polypropylene bags with PE liners or 50kg fiber drums. Store in cool, dry, ventilated spaces away from incompatibles.