KST-UV312 is a high-performance oxanilide ultraviolet absorber specifically developed to protect polymer materials from UV-induced degradation. Ultraviolet radiation, especially in the UVB range (280–320 nm), is one of the primary causes of polymer aging, leading to discoloration, embrittlement, loss of mechanical properties, and surface cracking. KST-UV312 offers targeted and efficient absorption in this critical wavelength range, making it a reliable solution for extending the service life of plastics.
Strong UVB absorption (280–320 nm)
Peak absorption wavelength at 298 nm
Excellent photostability and long-term effectiveness
Reduces yellowing and discoloration
Improves mechanical property retention after UV exposure
Good compatibility with a wide range of polymers
Low volatility and good thermal stability during processing
KST-UV312 is suitable for various polymer systems requiring UV protection:
Polyamide (PA) engineering plastics
Polycarbonate (PC) materials
Polyvinyl chloride (PVC) products
Polyurethane (PU) elastomers and coatings
Polyester resins such as PET and PBT
Outdoor applications (automotive parts, cables, films, coatings)
KST-UV312 belongs to the oxanilide class of UV absorbers. It works by selectively absorbing harmful UVB radiation and converting it into harmless thermal energy through a non-radiative dissipation process. This mechanism prevents the formation of free radicals and suppresses the photodegradation chain reactions within polymer matrices, thereby maintaining structural integrity and appearance over time.
Recommended dosage: typically 0.1% – 0.5% depending on application and exposure conditions
Can be incorporated during compounding, extrusion, or injection molding
Compatible with other stabilizers such as antioxidants and HALS for synergistic effects
Store in a cool, dry, and well-ventilated place. Avoid direct sunlight and moisture. Keep the container tightly closed after use to maintain product stability.
| Chemical Component | N-(2-ethoxyphenyl)-N'-(2-ethy|phenyl)oxamide |
| CAS NO. | 23949-66-8 |
| Appearance | White powder |
Purity | ≥ 99% |
| Melting Point | 124-127℃ |
| Light transmittance | 460nm≥96%;500nm≥98% |
| Product Structure |  |
Product Feature
UVabsorber KST-UV312 is an oxalanilide UV absorber with outstanding UVB absorption efficiency. It can be able to
absorb 280-320 nm ultraviolet light, with an absorption peak of 298 nm. It has the characteristics of good compatibility, low volatility, good thermal stability, and high absorption efficiency. It does not react with metal ions, does not cross influence with whitening agents, and does not overlap with the absorption of photoinitiators. Suitable for polyamide, polyvinyl chloride, polycarbonate, acrylic resin, unsaturated resin, cellulose resin, thermoplastic polyurethane, polymethyl methacrylate, powder coating, and solvent coating.
Application Fields
PA、PC、PVC、PU and PET/PBT resin.
