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TEA-PHENYLBENZIMIDAZOLE SULFONATE.

Valuable CAS 73705-00-7 / UV ABSORBER, UV FILTER

TEA-PHENYLBENZIMIDAZOLE SULFONATE is a highly effective chemical UV filter primarily designed to protect against UVB radiation. It safeguards skin cells from sun-induced damage by absorbing harmful light energy and is valued for its water solubility and low potential for irritation.

Summary

UV absorber UV filter

Science

Mechanism of Action

This ingredient, a salt of Phenylbenzimidazole Sulfonic Acid (also known as Ensulizole), functions by creating a uniform protective film on the stratum corneum. Upon application, it effectively absorbs UVB radiation within the 290-320 nm range, with peak absorption at 306 nm. This absorption process converts light energy into heat, preventing photons from penetrating deeper skin layers and mitigating UVB-induced DNA damage, such as cyclobutane pyrimidine dimers, thereby protecting keratinocytes from oxidative stress.

Research

Clinical Evidence

High confidence
Effective range 4–8%
Optimal

8%

Key findings

  1. 01 Regulatory approvals from the European Union's SCCS confirm its efficacy as a UVB filter at concentrations up to 8.0% w/w globally (excluding US, Canada, Australia).
  2. 02 FDA and national regulatory bodies in the United States, Canada, and Australia approve its use as an effective UVB filter at concentrations up to 4.0%.

Transparency

Dusting Analysis

Not commonly dusted

As a water-soluble UV filter designed to form a uniform, non-particulate film on the skin, TEA-PHENYLBENZIMIDAZOLE SULFONATE does not typically present issues with 'dusting' or visible residue.

The Formula

Formulation

Solubility
Water
Optimal pH 6 – 7
0 7 14

Stability

TEA-PHENYLBENZIMIDAZOLE SULFONATE is derived from Phenylbenzimidazole Sulfonic Acid, which is poorly water-soluble and requires neutralization (e.g., with triethanolamine or basic amino acids) to achieve solubility and stability. Optimal stabilization occurs within a pH range of 6.0-7.0, as exceeding pH 7.0 without sufficient neutralization can lead to crystal formation, compromising product efficacy and texture. It demonstrates good photostability and can enhance the stability of other less stable UV filters, such as avobenzone, when combined in a formulation. Hydrophilic polymers can further improve its spreading and film-forming capabilities in aqueous systems.

Synergies

  • Other UV filters, particularly less photostable ones like avobenzone, to improve overall stability and broad-spectrum protection.
  • Hydrophilic polymers (e.g., poly(vinyl alcohol), gelatin) to enhance film formation and UV absorbance in aqueous formulations.

Conflicts

  • Formulations with a pH below 6.0-7.0 without adequate neutralization, which can cause the free acid form to crystallize, resulting in diminished efficacy and an undesirable grainy texture.

Safety

Safety Profile

CIR Status
Not reviewed
Max tested
8%
Sensitization risk Low

The Scientific Committee on Consumer Products (SCCP) has deemed Phenylbenzimidazole Sulfonic Acid and its salts safe for use as UV filters at a maximum concentration of 8.0% w/w in cosmetic products. In the United States, Canada, and Australia, the maximal approved concentration for Ensulizole (phenylbenzimidazole sulfonic acid) is restricted to 4.0%. The FDA formally recognized Ensulizole for sunscreen labeling in the U.S. in 1999.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Valuable

TEA-PHENYLBENZIMIDAZOLE SULFONATE is a valuable, water-soluble UVB filter offering reliable sun protection with low irritancy and comedogenicity, making it highly suitable for a range of everyday SPF products.

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