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Sodium Hexametaphosphate

Sodium hexametaphosphate is a white, crystalline powder commonly used as a sequestrant, emulsifier, and texturizer in various industrial and food applications. It plays a key role in water treatment, food processing, and detergents. This chemical is highly soluble in water and requires careful handling due to its potential health effects.

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CAS: 10124-56-8

Characteristics:

  • Appearance: White, granular or glassy solid
  • Odor: Odorless
  • Solubility: Highly soluble in water
  • pH: Slightly acidic to neutral (pH 5.8–7.3 for a 1% solution)
  • Density: Approx. 2.48 g/cm³
  • Stability: Stable under normal conditions but hydrolyzes in water over time to form orthophosphates
  • Hygroscopic Properties: Absorbs moisture from the air, leading to potential caking

Other Names:

  • SHMP
  • Hexasodium Metaphosphate
  • Sodium Polyphosphate
  • Calgon (trade name)

Safety Considerations:

  • Skin & Eye Irritation: May cause mild irritation; wear gloves and protective eyewear.
  • Inhalation Risk: Dust may cause respiratory discomfort; use in a well-ventilated area and wear a dust mask.
  • Ingestion Hazard: Generally low toxicity but may cause gastrointestinal discomfort in large quantities.
  • Reactivity Risk: Avoid prolonged contact with acids and strong oxidizers, as it may lead to decomposition.
  • Storage: Store in a cool, dry, well-ventilated area, away from moisture to prevent caking.