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SODIUM HEXAMETAPHOSPHATE.

Valuable CAS 10124-56-8 / 10361-03-2 / 68915-31-1 / ANTICORROSIVE, CHELATING, FRAGRANCE

Sodium Hexametaphosphate is a polyphosphate compound primarily utilized in skincare formulations for its potent chelating properties, safeguarding product stability and enhancing the efficacy of other ingredients by neutralizing detrimental metallic ions. It also contributes to product integrity by preventing packaging corrosion and can mask undesirable odors.

Summary

Chelating agent Masking agent Anti-corrosive agent

Science

Mechanism of Action

As a primary chelating agent, Sodium Hexametaphosphate binds to and inactivates metallic ions within cosmetic formulations. This action is crucial for preventing product degradation, such as discoloration and oxidation, thereby preserving the stability and enhancing the performance of active ingredients. Additionally, it functions as an anti-corrosive agent, protecting metallic packaging components, and acts as a masking agent to mitigate the sensory impact of less desirable ingredient odors.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

1%

Transparency

Dusting Analysis

Not commonly dusted
Min. effective
0%
Red flag below
100%

While safe in diluted, properly formulated products up to 1%, pure Sodium Hexametaphosphate is a severe skin irritant. Therefore, dusting or direct skin contact with the unformulated, concentrated powder presents a significant risk for irritation and should be strictly avoided.

The Formula

Formulation

Solubility
Water
Optimal pH 5.8 – 8
0 7 14

Stability

Sodium Hexametaphosphate exhibits excellent water solubility but is insoluble in organic solvents. Its stability is compromised under strong acidic conditions and elevated temperatures, leading to hydrolysis into sodium trimetaphosphate and sodium orthophosphate. Optimal functionality and stability are observed within a slightly acidic to neutral/slightly alkaline pH range, specifically between 5.8 and 8.0.

Conflicts

  • Strong acidic conditions (due to hydrolysis)
  • Ingredients sensitive to metal ion chelation (as it will chelate metal ions from them)

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
1%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel has deemed Sodium Hexametaphosphate safe for use in cosmetic products, provided formulations are designed to prevent skin irritation. It is permitted in EU cosmetic products under general regulations and holds a Generally Recognized As Safe (GRAS) status from the FDA for use as a food additive.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

Sodium Hexametaphosphate is a valuable ingredient primarily for its critical role in enhancing product stability and ingredient efficacy by effectively chelating metal ions, ensuring product longevity and performance within its specified concentration limits.

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