Sinosorb® UV-312 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.
SINOSORB® UV-312
（Oxalidinyl aniline UV absorbers）
Chemical Name:
N-(2-Ethoxyphenyl)-N'-(4-ethylphenyl)-ethlyene diamide; N 1 -(2-Ethoxyphenyl)-N 2 -(2-ethylphenyl)oxalamide; UV Absorber 312
Cas No.:
23949-66-8
MF:
C18H20N2O3
MW：
312.36
Structure:
Sinosorb® UV-312 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.
Item | Specification |
Appearance | White powder |
Purity | ≥99.0% |
Melting point | 124-127℃ |
Light transmittance | 460nm≥96% |
500nm≥98% |
PA, PC. PVC, PU and PET/PBT resin.
25kgs/drum.
Being kept in dry, clean warehouse with well ventilation.
Avoid exposing to light and heating.
Protecting the product from leakage, rain and insolation during transportation.
Q1: What is Sinosorb® UV-312 and what is its chemical classification?
A: Sinosorb® UV-312 (historically known as UV Absorber VSU or UV 312) is a premium commercial-grade light stabilizer belonging to the oxalanilide (oxamide) chemical class. Known by its dual nomenclature as N-(2-Ethoxyphenyl)-N'-(4-ethylphenyl)-ethlyene diamide or N1-(2-Ethoxyphenyl)-N2-(2-ethylphenyl)oxalamide under CAS 23949-66-8, it acts as a non-color-contributing UV screening agent that protects sensitive organic matrices from photolytic polymer breakdown.
Q2: What are the common uses of UV Absorber VSU (UV 312) in the plastics industry?
A: The common uses of UV Absorber VSU are focused heavily on plastics that require pristine initial color and high-temperature curing. Its main uses include stabilization additives for polyamides (Nylon), thermoplastic polyurethanes (TPU), polycarbonates, and high-bake powder coatings. It is favored by chemical compounding engineers because it protects materials without causing initial yellow discoloration or interacting with curing
catalysts.
Q3: Why choose an oxalanilide UV absorber like Sinosorb® UV-312 over benzotriazoles?
A: Unlike benzotriazole light stabilizers, oxalanilides like Sinosorb® UV-312 do not absorb any light within the visible violet-blue spectrum, meaning they add absolutely zero yellow tint to a clear formulation. Additionally, traditional stabilizers frequently cross-react with residual metal catalysts left behind from plastic manufacturing, turning the compound bright yellow. Sinosorb® UV-312 remains completely inert to metal ions, providing superior color stability during intense thermal processing.
Q4: Where can I buy high-quality Sinosorb® UV-312 in large quantities with factory-direct pricing?
A: Our proprietary brand Sinosorb® UV-312 guarantees excellent chemical purity (99.0%) and high light transmittance. We provide full logistics tracking for orders spanning from validation testing trial drums to complete full-container sea shipments. Contact our polymer stabilizers division today to request real-time pricing.
We offer a variety of options to help you find the right product for your application
Provide formulation optimization support for water-based/solvent-based systems
Full coverage of REACH, FDA, and GB standards
99.8% on-time delivery rate, 10,000-ton production capacity guarantee
