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SODIUM FLUOROSILICATE.

Avoid CAS 16893-85-9 / ANTIPLAQUE, ORAL CARE

Sodium Fluorosilicate is an inorganic compound primarily employed in cosmetic formulations as an opacifier, enhancing product appearance by reducing transparency. It also functions as a stabilizer, contributing to the overall integrity and longevity of a formulation.

Summary

Opacifier Stabilizer

Science

Mechanism of Action

Within cosmetic matrices, Sodium Fluorosilicate operates by creating a desired opalescent or opaque effect, thereby improving aesthetic appeal. Its stabilizing properties help to maintain the physical and chemical integrity of the product over time, extending shelf life.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

This ingredient exhibits poor solubility in cold water, which improves with increasing temperature, and is insoluble in alcohol. It is susceptible to hydrolysis in alkaline environments and can release silicon tetrafluoride when exposed to acidic conditions. Sodium Fluorosilicate is sensitive to moisture and incompatible with oxidizing agents. It can form precipitates with compounds containing calcium, magnesium, or silicon ions. Solutions may generate hydrofluoric acid, which is corrosive and can damage glass, and the ingredient can also react with rubber materials.

Conflicts

  • oxidizing agents
  • water (excess moisture)
  • alkaline medium
  • acidic medium
  • compounds containing calcium ions
  • compounds containing magnesium ions
  • compounds containing silicon ions
  • rubber materials

Safety

Safety Profile

CIR Status
Not reviewed
Sensitization risk High

Sodium Fluorosilicate is deemed toxic via ingestion, inhalation, and skin absorption. Direct skin contact can lead to adverse reactions such as rash, redness, burning sensations, and potentially ulcer formation. It is classified as an irritant to the eyes, skin, and respiratory system. While it is stated to be generally safe at typical cosmetic concentrations, strict adherence to usage guidelines is imperative given the inherent risks and potential for hydrofluoric acid formation in solution.

Your Skin

Skin Compatibility

No Normal
No Dry
No Oily
No Sensitive
Irritancy High
Comedogenicity Unknown

Our Assessment

Verdict

Avoid

Sodium Fluorosilicate, despite its formulation benefits as an opacifier and stabilizer, presents significant safety concerns including high irritancy, potential toxicity, and an 'unreviewed' safety status, with no proven direct benefits to skin health, rendering it unsuitable for precision skincare formulations.

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