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PEG-25 PABA.

Valuable CAS 116242-27-4 / LIGHT STABILIZER, UV ABSORBER, UV FILTER

PEG-25 PABA is an organic, water-soluble UV-B filter derived from para-aminobenzoic acid (PABA). It functions by absorbing harmful ultraviolet radiation within a specific spectrum, thereby protecting the skin from photo-aging and potential sun damage.

Summary

sunscreen light stabilizer uv absorber uv filter

Science

Mechanism of Action

This ingredient operates as a UV-B filter by absorbing radiation primarily between 280-320 nm. Its molecular structure facilitates a resonance effect where valence electrons shift, matching the frequency of UV-B light. The absorbed energy is then safely dissipated as heat or transformed into longer, less damaging wavelengths, minimizing UV-induced stress on the skin.

Research

Clinical Evidence

High confidence
Effective range N/A
Optimal

10%

Key findings

  1. 01 The European Commission's Scientific Committee on Cosmetology (SCC) concluded that PEG-25 PABA is effective as an organic UV-B filter, absorbing radiation between 280-320 nm, and forms a protective shield in the upper skin layer at concentrations up to 10%.

Transparency

Dusting Analysis

Not commonly dusted

The provided research data does not offer specific information regarding the 'dusting' properties, thresholds, or red-flag percentages for PEG-25 PABA in cosmetic formulations.

The Formula

Formulation

Solubility
Water
Optimal pH N/A
0 7 14

Stability

Polyethylene glycols, including PEG-25 PABA, are generally noted for their good skin tolerance and versatile solubility profiles. It is reported to be compatible with anionic ingredients in formulations.

Synergies

  • anionic ingredients

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
10%
Sensitization risk Low

The European Commission's SCC has deemed PEG-25 PABA safe for use in cosmetic products as a UV light absorber at a maximum concentration of 10%, concluding it is not allergenic, irritating, or genotoxic, with low to moderate dermal absorption. In the United States, the FDA has not reviewed its safety and efficacy for sunscreen drug products, thus it cannot be used as an active sunscreen ingredient. However, it can function as a UV light absorber to prevent product degradation. The parent compound, PABA, has been tentatively deemed 'not generally recognized as safe and effective' (Non-GRASE) by the FDA due to sensitization risks. Trace amounts of 1,4-dioxane, a by-product of ethoxylation, can be controlled through purification processes.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

PEG-25 PABA is a valuable organic UV-B filter, scientifically recognized in Europe for its effective protection against photo-aging at up to 10% concentration, exhibiting low irritation potential and broad formulation compatibility.

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