Product Description: UV Absorber 326｜CAS No. 3896-11-5
UV Absorber 326 belongs to the benzotriazole-class ultraviolet absorber, engineered to intercept and weaken ultraviolet transmission.
It features outstanding thermal stability and low volatility, maintaining stable properties during high-temperature processing. It efficiently absorbs UV rays across the 290–400 nm band, paired with superior chemical inertness and no adverse interactions with other formula ingredients.
This additive boasts excellent substrate compatibility and uniform dispersion performance, with no blooming, frosting or migration risks. It delivers premium photochemical stability to resist photodegradation and discoloration under long-term light exposure. The product is colorless, non-toxic, odorless and immersion-resistant, with favorable cost performance and stable supply for bulk production.
When applied to textile fabrics, it forms reliable UV shielding, mitigates color fading, and notably enhances the light fastness of disperse dyes on polyester fibers.
UV Absorber 326 Chemical Properties
| Melting point | 144-147 °C(lit.) |
| Boiling point | 460.4±55.0 °C(Predicted) |
| Density | 1.26±0.1 g/cm3(Predicted) |
| Vapor pressure | 0Pa at 20℃ |
| Storage temp | Sealed in dry,Room Temperature |
| Solubility | Chloroform (Slightly), Ethyl Acetate (Slightly), Methanol (Slightly) |
| Pka | 9.31±0.48(Predicted) |
| Form | Solid |
| Color | Pale Yellow to Light Yellow |
| Water Solubility | 4μg/L at 20℃ |
| InChI | InChI=1S/C17H18ClN3O/c1-10-7-12(17(2,3)4)16(22)15(8-10)21-19-13-6-5-11(18)9-14(13)20-21/h5-9,22H,1-4H3 |
| InChIKey | OCWYEMOEOGEQAN-UHFFFAOYSA-N |
| SMILES | C1(O)=C(C(C)(C)C)C=C(C)C=C1N1N=C2C=C(Cl)C=CC2=N1 |
| LogP | 6.580 (est) |
| CAS DataBase Reference | 3896-11-5(CAS DataBase Reference) |
| EPA Substance Registry System | 2-tert-Butyl-6-(5-chloro-2H-benzotriazol-2-yl)-p-cresol (3896-11-5) |
| Hazard Codes | Xi |
| Risk Statements | 36/37/38-53 |
| Safety Statements | 26-36-61 |
| WGK Germany | 1 |
| HS Code | 29339900 |
Product Application: UV Absorber 326 CAS#3896-11-5
UV Absorber 326 is widely used for polymer systems including polyvinyl chloride (PVC), polystyrene (PS), unsaturated resins, polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene (PE), ABS resins, epoxy resins and other related polymer end products. It delivers reliable UV protection to extend service life and prevent photoaging of these materials.
