1. Product Overview

UV absorber UV-329 is a high-efficiency benzotriazole UV light stabilizer. It selectively absorbs UVA/UVB ultraviolet rays in the range of 280–380 nm, featuring extremely low volatility, excellent thermal stability and weather resistance. It has excellent compatibility with various polymer materials, and is resistant to migration and blooming without affecting the transparency of finished products. It is suitable for high-temperature processing and long-term outdoor exposure scenarios. It is often compounded with hindered amine light stabilizers and antioxidants to synergistically improve the anti-aging, anti-yellowing and anti-chalking properties of materials.

2. Basic Chemical Information

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3. Technical Specifications (Industry Standard Grade)

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4. Physical Properties & Solubility

This product is well-formed crystalline powder with high melting point and outstanding thermal stability. It features minimal volatilization and resistance to decomposition and discoloration during high-temperature processing. High purity and good light transmittance ensure that its addition will not impair the appearance and color of transparent or colored finished products. At room temperature, it is readily soluble in organic solvents such as, xylene, esters,  and alkanes, slightly soluble in water, and can be rapidly dispersed in various resin, coating, rubber and plastic systems.

5. Key Product Features

• Strong UV absorption capacity: Precisely absorbs full-band ultraviolet light, effectively inhibits photodegradation of polymers, and delivers excellent anti-yellowing and anti-aging performance.
• High temperature resistance & low volatility: Higher melting point compared with similar products, suitable for high-temperature extrusion and injection molding of plastics; low volatilization loss and no blooming.
• Excellent compatibility: Compatible with most resins including PC, ABS, PP, PVC, PU, acrylic and epoxy resin; no migration or blooming during long-term service.
• Remarkable synergistic effect: When compounded with hindered amine light stabilizers and antioxidants, it greatly extends the outdoor weathering life of finished products for harsh exposure environments.
• Wide applicability: Compatible with room-temperature curing for coatings and high-temperature processing for rubber & plastics, works for both transparent and colored articles without impairing substrate properties and appearance.

6. Application Fields

Widely used in engineering plastics, general-purpose plastics, high-end outdoor coatings and polymer products. Main applications include PC/ABS alloy plastics, PP/PVC outdoor profiles, home appliance housings and automotive plastic parts; high-end outdoor coatings, industrial baking finishes, wood coatings and anti-corrosion coatings. It is also applicable to anti-UV aging modification of polyurethane elastomers, adhesives, films and fibers.

7. Recommended Dosage

For general products: 0.1%–0.4% by weight of the substrate. For products requiring long-term outdoor exposure, high light transmittance and superior weather resistance: 0.4%–0.7%. When compounded with hindered amine light stabilizers, the dosage can be appropriately reduced to optimize cost while maintaining protective performance. Adjustments can be made according to formulation and application scenarios.

8. Application Method

It can be added at any stage including resin synthesis, mixing, injection extrusion or coating formulation & color matching. It can be directly fed as dry powder, or pre-dissolved in organic solvents or pre-dispersed in resins. It can withstand processing temperature up to ≤300 ℃ with excellent stability at high temperature. Uniform dispersion can be achieved via conventional stirring and kneading; no special modification process is required.

9. Packaging, Storage & Shelf Life

Packaging: 25 kg per fiber drum lined with moisture-proof plastic bag. Custom packaging available upon customer request. Storage: Keep hermetically sealed in cool, dry and ventilated warehouse. Keep away from heat sources, acids, alkalis, corrosive chemicals and oxidants. Avoid direct sunlight and moisture. Separate storage and transportation are required. Shelf Life: 24 months for original sealed packages stored at ambient temperature. Once opened, seal promptly for moisture protection and use as soon as possible.

10. Notes

The parameters in this data sheet are based on industry standards and factory test data, for reference in product selection and process design only. Users shall conduct lab tests before use to verify compatibility according to their own formulations, production processes and application conditions. The manufacturer reserves the right to optimize product parameters and update technical specifications.