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Moumoujus

POLYSILICONE-15.

Valuable CAS 207574-74-1 / LIGHT STABILIZER, UV ABSORBER, UV FILTER

Polysilicone-15 is a highly stable, silicone-based organic compound engineered to function as a precision ultraviolet B (UVB) filter. It effectively protects skin by absorbing harmful UVB radiation, thereby preventing acute sunburn and mitigating long-term photoaging effects. Its polymeric nature allows for the formation of a breathable, water-resistant film.

Summary

UV filter UV absorber

Science

Mechanism of Action

This silicone-based UV-B filter operates by absorbing UVB radiation within the 280-320 nm range, peaking at 312 nm, and transforming this energy into heat, preventing its absorption by skin cells. Its unique polymeric structure creates a flexible, transparent, and water-resistant film on the skin's surface, which uniformly disperses the light-absorbing chromophores. Beyond its direct protective action, Polysilicone-15 also acts as a photostabilizer, enhancing the stability of the formulation itself and other co-formulated UV filters against UV-induced degradation.

Research

Clinical Evidence

High confidence
Effective range ≤10%
Optimal

N/A

Key findings

  1. 01 Approved as an effective UV-B filter in the EU and other regions, demonstrating absorption of UV-B radiation from approximately 280 to 320 nm, which prevents sunburn and photoaging.
  2. 02 Studies reported very low dermal absorption, measured at 2% after 16 hours, indicating minimal systemic exposure.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH 4 – 5
0 7 14

Stability

Exhibits robust stability across a pH range of 4.0–5.0 and at elevated temperatures, resisting decomposition. Its oil-soluble nature is advantageous for seamless incorporation into oil-based formulations, contributing to overall formula stability and preventing crystallization of other sunscreen ingredients. It is inherently photostable.

Synergies

  • Enhances the photostability of other UV filters, such as avobenzone.
  • Can synergistically boost SPF when paired with other sunscreens like Ensulizole.

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
10%
Sensitization risk Low

The European Commission's Scientific Committee on Consumer Safety (SCCS) concluded its use up to a maximum of 10% poses no health hazard, citing minimal dermal absorption (2%), absence of sensitization, irritation, photoallergenicity, and mutagenicity. Although not FDA-approved as an active sunscreen in the US, it is permitted up to 1% to protect product formulations from UV degradation. Generally considered safe with low irritation potential.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

Polysilicone-15 is a valuable silicone-based UV-B filter, highly effective at concentrations up to 10% for preventing sunburn and photoaging, supported by a strong safety profile and broad skin compatibility.

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