UV-B Filter
Sunbest-ENS
INCI: Phenylbenzimidazole Sulfonic Acid
Formulator notes
UV-B filter (peak 306 nm) that dissolves in water once neutralised with NaOH or triethanolamine, for light, non-greasy sunscreens. Use 1-8% as acid (≤4% US). REACH registered (EU; UK DUINS).
Hold it The molecule in AR on a phone, in 3D anywhere else.
Open in the SPF Lab An in-silico simulator over the Sunbest range, pre-loaded with this filter.
Highlights
- Absorbs UV-B, peak at 306 nm.
- Water-soluble (sulfonic-acid group): for lightweight, non-greasy sunscreens.
- Photostable.
- Non-comedogenic.
Technical data
| INCI name | Phenylbenzimidazole Sulfonic Acid |
|---|---|
| Also known as | PBSA, ENS, Ensulizole |
| IUPAC name | 2-phenyl-1H-benzimidazole-5-sulfonic acid |
| CAS number | 27503-81-7 |
| EC number | 248-502-0 |
| HSN code | 29339990 |
| Type | UV-B Filter |
| Form | Powder (White) |
| Solubility | Water - only on adding NaOH or Triethanolamine; Ethanol; Propylene Glycol; Dimethyl Isosorbide |
| Typical dosage | 1-8% (as acid); ≤4% (US) |
| UV profile | UV-B: 280-320nm, peak absorption at 306 nm. |
| UV band | UV-B |
| Peak absorption (nm) | 306 |
| Molecular weight (g/mol) | 274.3 · Low for a UV filter (under 300 g/mol) |
| pH min | 7 |
| pH max | 9 |
| Pack size (kg) | 25 |
| MOQ (kg) | 300 |
| Shelf life (years) | 2 |
| REACH registered | Yes |
| REACH regions | European Union, UK DUINS Registered |
| REACH tonnage band | <= 100 MT |
Applications
- Sunscreens & SPF Products
- Foundations & BB Creams
- Lip Care (Balms, Lipsticks)
Frequently asked
What is Sunbest-ENS?
Sunbest-ENS is UV-B filter, INCI name Phenylbenzimidazole Sulfonic Acid (CAS 27503-81-7), supplied by Vinner Labs for sunscreens & SPF products.
What is the typical use level of Sunbest-ENS?
The typical dosage of Sunbest-ENS is 1-8% (as acid); ≤4% (US) in finished formulations. Exact levels depend on the application and regional regulations.
Is Sunbest-ENS REACH registered?
Yes, Sunbest-ENS is REACH registered (European Union, UK DUINS Registered) in the <= 100 MT tonnage band.
What is Sunbest-ENS soluble in?
Sunbest-ENS is soluble in: Water - only on adding NaOH or Triethanolamine; Ethanol; Propylene Glycol; Dimethyl Isosorbide.
Related ingredients
Samples & documentation
Request a sample, spec sheet, quotation or regulatory statement for Sunbest-ENS, ask a specialist.