Sodium Meta Hexaphosphate
Molecular Weight: 611.77
Appearance: A white crystalline powder, or a colorless, transparent, glassy, flaky, or lumpy solid; odorless.
Solubility: Highly soluble in water (solubility at 20°C is approximately 973 g/L), though the dissolution rate is relatively slow; insoluble in organic solvents such as ethanol and diethyl ether; aqueous solutions are weakly acidic (pH 5.5–6.5).
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Sodium Hexametaphosphate
Molecular Formula: (NaPO3) 6
Molecular Weight: 611.77
Appearance: A white crystalline powder, or a colorless, transparent, glassy, flaky, or lumpy solid; odorless.
Solubility: Highly soluble in water (solubility at 20°C is approximately 973 g/L), though the dissolution rate is relatively slow; insoluble in organic solvents such as ethanol and diethyl ether; aqueous solutions are weakly acidic (pH 5.5–6.5).
Hygroscopicity and Stability: Exhibits extremely strong hygroscopicity; when exposed to air, it readily deliquesces and cakes, gradually transforming into a viscous, gel-like substance. Its chemical stability is moderate; it undergoes facile hydrolysis in the presence of warm water, acids, or bases, ultimately yielding orthophosphates. It decomposes at high temperatures (>600°C).
Key Chemical Properties
Strong Chelating Ability: Forms stable, water-soluble complexes with metal ions such as calcium, magnesium, iron, and manganese; serves as a highly effective water softener and metal ion sequestering agent.
Dispersing / Anti-flocculating Ability: Inhibits the crystallization and precipitation of calcium and magnesium salts, disperses solid particles, and prevents agglomeration.
Buffering Capacity: Stabilizes the pH of a system and mitigates fluctuations in acidity and alkalinity.
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Physical Parameters |
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| Density | 2.18 g/cm³ |
| Melting Point | 616°C (with decomposition) |
| Boiling Point | Approximately 1500°C |
Quality Specifications (Industrial Grade / Food Grade)
| Sodium Hexametaphosphate Content | Industrial Grade ≥ 68%; Food Grade ≥ 70% |
| pH (1% Solution) | 5.5–6.5 |
| Water-Insoluble Matter | ≤ 0.1% |
| Heavy Metals (as Pb) | Food Grade ≤ 10 mg/kg |
| Arsenic (As) | Food Grade ≤ 3 mg/kg |
Safety, Storage, and Transport
Safety: Low toxicity (Oral LD₅₀ in rats: approx. 4000 mg/kg); irritates skin, eyes, and respiratory tract; avoid inhaling dust; Food Grade and Industrial Grade products must be strictly segregated and never intermixed.
Storage: Store in a cool, dry place; keep containers tightly sealed to prevent moisture ingress; protect from light; keep away from acids and humid environments; take measures to prevent caking and hydrolysis-induced degradation.
Transport: Transport as a general chemical; protect from rain, direct sunlight, and moisture; co-transport with acids or strong oxidizing agents is strictly prohibited.
Storage: Store in a cool, dry, well-ventilated area; ensure packaging remains sealed to avoid exposure to air and moisture; regularly inspect for signs of degradation or contamination.
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