Sodium hexametaphosphate ( sodium cyclo-hexaphosphate ) SHMP [ CAS: 68915-31-1 ] - 25 000g

Sodium Hexametaphosphate (SHMP)
Chemical Formula: (NaPO₃)₆
Molar Mass: 611.77 g/mol
CAS Number: 10124-56-8
EC Number (WE): 233-343-1
Appearance: White, crystalline or powdery solid

Sodium hexametaphosphate (SHMP) is an inorganic polyphosphate compound composed of repeating metaphosphate units. It is known for its strong chelating and dispersing capabilities and is widely used in water treatment, cleaning agents, ceramics, and other industrial applications. Due to its hygroscopic nature, it should be stored carefully to avoid clumping.

Chemical and Physical Properties

• Density: 2.484 g/cm³

• Melting Point: ~628 °C (decomposes at higher temperatures)

• Boiling Point: ~1500 °C (approximate; decomposes)

• Solubility in Water: Highly soluble, forms a viscous alkaline solution

• pH (1% solution): Typically 6.0–8.0

• Odor: Odorless

• Hygroscopicity: Absorbs moisture from the air

Applications

1. Water Treatment

• Prevents scale formation by sequestering calcium and magnesium ions

• Used in boiler feedwater treatment and softening systems

2. Detergents and Cleaning Products

• Acts as a water-softening agent in laundry and dishwashing detergents

• Improves cleaning efficiency by binding hard water ions

3. Ceramics and Industrial Formulations

• Used as a dispersant to maintain uniform distribution of clay in ceramic production

• Functions as a deflocculant in mineral processing and metallurgical applications

4. Oil and Gas Industry

• Applied in drilling fluids to stabilize slurry mixtures and prevent particle aggregation

5. Laboratory and Technical Use

• Used as a stabilizer, chelating agent, and dispersant in a range of formulations

Functional Benefits

• Chelating Agent: Binds metal ions and improves performance in water-sensitive formulations

• Dispersant: Enhances the homogeneity of suspensions by preventing particle aggregation

• Water Softener: Sequesters ions responsible for water hardness

• Stabilizer: Maintains consistency and stability in technical mixtures and formulations

Safety

Signal Word: None required under GHS
GHS Classification: Not classified as hazardous under standard conditions

General Hazards:

• Dust may cause mechanical respiratory and eye irritation

• Prolonged skin contact may cause dryness or mild irritation

Precautionary Measures:

• Storage: Store in a cool, dry, and well-ventilated area. Avoid exposure to moisture

• Handling: Use gloves, safety goggles, and a dust mask when handling bulk quantities

• First Aid:

  • Eye Contact: Rinse with water for several minutes

  • Skin Contact: Wash with soap and water

  • Inhalation: Move to fresh air if irritation occurs

  • Ingestion: Rinse mouth and seek medical advice if large amounts are consumed

Environmental Considerations

Sodium hexametaphosphate contains phosphorus, which may contribute to eutrophication in aquatic environments if released in excessive quantities. Disposal should follow local environmental regulations to minimize impact on surface waters.