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Moumoujus

SILVER BOROSILICATE.

Optional / ANTIMICROBIAL, SKIN CONDITIONING

Silver Borosilicate is an inert, insoluble cosmetic ingredient valued for its aesthetic and textural contributions to formulations. Comprising secure silver molecules within a borosilicate glass matrix, it does not penetrate the skin or release bioavailable silver, ensuring a purely topical presence.

Summary

Cosmetic Colorant Bulking Agent Abrasive Preservative Skin-conditioning Agent - Miscellaneous

Science

Mechanism of Action

Upon topical application, Silver Borosilicate remains on the skin surface due to its insoluble and inert nature. The silver component is securely bound within the molecular structure, preventing its bioavailability for dermal application. Consequently, it does not exhibit the typical antimicrobial mechanisms associated with free silver ions, such as interfering with cellular respiration or DNA function, acting instead as a physical modifier.

Research

Clinical Evidence

Insufficient-data 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

Silver Borosilicate, as a borosilicate glass, exhibits robust stability, maintaining chemical inertness and insolubility under standard cosmetic formulation conditions. The encapsulated silver is molecularly secure within the matrix, preventing leaching or release and preserving ingredient integrity.

Conflicts

  • Hydrofluoric acid (HF)
  • Phosphoric acid (H3PO4)
  • Hot strong caustic solutions

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel concluded that borosilicate glasses, including Silver Borosilicate, are safe as cosmetic ingredients. They noted these ingredients are insoluble, inert, do not significantly penetrate the skin, and that the silver is secure and not bioavailable. While no specific maximum concentration is reported for Silver Borosilicate, other borosilicate glasses in the same assessment were safely used up to 97%. Separately, the Scientific Committee on Consumer Safety (SCCS) preliminary opinion (2025) on micron-sized particulate silver (not Silver Borosilicate) considers it safe up to 0.2% in rinse-off and 0.3% in leave-on products. The FDA permanently lists Silver (CI 77820) as a colorant for cosmetic use, restricting it to 1% in fingernail polish.

Your Skin

Skin Compatibility

No Normal
No Dry
No Oily
Yes Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Verdict

Optional

Silver Borosilicate is a safe, inert cosmetic ingredient valued primarily for its stable bulking and colorant properties without penetrating the skin or exhibiting direct biological activity.

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References

Sources