1. Product Overview

UV absorber UV-328 is a high-efficiency benzotriazole light stabilizer. It strongly absorbs ultraviolet rays in the range of 280–380 nm and effectively suppresses outdoor aging issues of polymer materials such as yellowing, loss of gloss, chalking and cracking, so as to extend the service life of finished products. It features low volatility, excellent weather resistance and good compatibility. Suitable for room-temperature and low-temperature curing systems, it is widely used in coatings, plastics, polyurethanes, adhesives and other fields. When compounded with hindered amine light stabilizers, it delivers outstanding synergistic anti-aging performance.

2. Basic Chemical Information

表格

3. Technical Specifications (Industry Standard Grade)

表格

4. Physical Properties & Solubility

This product is white to pale yellow crystalline powder with excellent thermal stability and extremely low volatility. It resists decomposition and migration during processing and boasts good light transmittance, and its addition will not affect the appearance and transparency of finished products. At 20 ℃, it is readily soluble in organic solvents such as  esters,and alcohols, slightly soluble in water, and compatible with various resin and coating processing systems.

5. Key Product Features

• Efficient UV aging resistance: Fully covers UVA/UVB bands to block UV degradation fundamentally, with remarkable performance against yellowing and chalking.
• Strong processing stability: High temperature resistance and low volatility; no decomposition, precipitation or migration under normal processing conditions.
• Broad compatibility: Excellent compatibility with mainstream resins including PP, PVC, ABS, polyurethane, acrylic and epoxy resin, no blooming occurs.
• Excellent synergistic effect: When compounded with HALS light stabilizers and antioxidants, it greatly prolongs outdoor weathering service life.
• Wide applicability: Compatible with high and low temperature curing processes, works for both transparent and colored products without impairing substrate appearance.

6. Application Fields

Suitable for outdoor wood coatings, automotive coatings, exterior wall coatings and industrial low-temperature curing coatings; outdoor modified plastic products made of PP, PVC, ABS, PU, etc. It can also be used for polymer materials such as polyurethane elastomers, adhesives and fiber coatings to effectively improve the outdoor weather resistance of various finished articles.

7. Recommended Dosage

General dosage: 0.1%–0.5% by weight of the substrate. For high weather resistance outdoor applications: 0.5%–0.8%. The dosage can be appropriately reduced when compounded with hindered amine light stabilizers to improve cost performance and protective effect. Adjust dosage according to actual formulation and service environment.

8. Application Method

It can be added directly during mixing, feeding and coating preparation. Dry powder feeding or pre-dissolution in organic solvents / pre-dispersion in resins are both available. Recommended processing temperature ≤280 ℃; avoid prolonged heating at high temperature. Uniform and stable dispersion can be achieved by simple stirring; no special process is required.

9. Packaging, Storage & Shelf Life

Packaging: 25 kg per fiber drum lined with moisture-proof bag; custom packaging available. Storage: Keep hermetically sealed in cool, dry and ventilated place. Keep away from heat sources, oxidants, acids, alkalis and corrosive materials. Avoid direct sunlight and moisture. Shelf Life: 24 months for original sealed packages. Once opened, use up promptly and seal well for moisture protection.

10. Notes

The data in this data sheet is for product selection and process reference only. Users shall verify the compatibility through small-scale tests according to their own formulations, processes and application scenarios. The manufacturer reserves the right to optimize and update product parameters.