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TIN OXIDE.

Valuable CAS 18282-10-5 / ABRASIVE, BULKING, OPACIFYING, VISCOSITY CONTROLLING

Tin Oxide is a highly stable, inert mineral ingredient valued in skincare and cosmetics for its remarkable optical properties and ability to refine product texture. It works by scattering and reflecting light, creating a sophisticated soft-focus effect that optically blurs imperfections while imparting a luminous, brightened appearance to the skin. Additionally, it contributes to product aesthetics and stability.

Summary

Abrasive (mild) Bulking agent Opacifying agent Viscosity controlling agent Light scattering agent Light reflecting agent Texture enhancer Product stabilizer

Science

Mechanism of Action

Tin Oxide operates through physical mechanisms on the skin's surface. As a finely milled particulate, it efficiently scatters and reflects incident light, diminishing the visual impact of fine lines, wrinkles, and other skin irregularities by creating a soft-focus effect. This light reflection also contributes to a brighter, more radiant skin appearance, particularly when formulated with other luminous agents like mica and titanium dioxide. Furthermore, it functions as a bulking and opacifying agent, improving the texture and consistency of formulations, delivering a smooth and silky application, and enhancing product resistance to light and moisture.

Research

Clinical Evidence

High confidence
Effective range 0.3–1.3%
Optimal

1.3%

Transparency

Dusting Analysis

Not commonly dusted

Tin Oxide is an inert cosmetic additive primarily providing optical and textural benefits, not a bioactive ingredient with a specific 'dusting threshold' for biological efficacy. Its effectiveness is related to its physical presence and dispersion rather than a chemical concentration required for a biological response.

The Formula

Formulation

Solubility
Unknown
Optimal pH N/A
0 7 14

Stability

Tin(IV) Oxide is a chemically inert and exceptionally stable metal oxide. It is practically insoluble in water, alcohol, and cold acids, functioning primarily as a particulate dispersion in cosmetic formulations. It demonstrates excellent stability across a broad pH range typically encountered in skincare products.

Synergies

  • Mica
  • Titanium Dioxide

Safety

Safety Profile

CIR Status
Safe as used
Max tested
1.3%
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) Expert Panel concluded Tin(IV) Oxide is safe for use at concentrations up to 0.4% in rinse-off products and up to 1.3% in leave-on products. Due to its water-insoluble nature and lack of percutaneous absorption, systemic exposure is not anticipated. The ingredient was historically listed by the FDA as a color additive but was delisted in 1975 due to 'no interest,' not safety concerns. The SCCS has not issued a specific opinion on Tin Oxide.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Tin Oxide is a valuable inert cosmetic ingredient, consistently proven safe and well-tolerated across all skin types, offering significant aesthetic benefits through light manipulation and texture improvement in precision skincare and makeup formulations.

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