Polyvinyl Chloride (PVC) is a widely used polymer in construction, automotive, and consumer goods industries. However, PVC is inherently sensitive to ultraviolet (UV) radiation, which can lead to dehydrochlorination, resulting in discoloration, embrittlement, and a significant loss of mechanical properties. To counteract these effects and ensure the durability and aesthetic appeal of PVC products, UV absorbers are indispensable. UV Absorber UV-328 (CAS No. 25973-55-1), a high-performance benzotriazole UV absorber, offers excellent protection for PVC. NINGBO INNO PHARMCHEM CO.,LTD., a leading manufacturer and supplier in China, provides this critical additive.

Understanding PVC Degradation by UV Light

When PVC is exposed to UV radiation, the energy is absorbed by the polymer, initiating a complex degradation process. This process involves the cleavage of carbon-chlorine bonds, releasing chlorine radicals. These radicals can then abstract hydrogen atoms from other parts of the polymer chain, creating new radical sites and leading to the formation of double bonds (unsaturation). This chain reaction causes the polymer to discolor (typically yellowing and then browning), become brittle, and lose its structural integrity. This is particularly problematic for PVC applications used outdoors or in high-light environments, such as window profiles, pipes, siding, and automotive interior components.

How UV Absorber UV-328 Protects PVC

UV Absorber UV-328 functions by absorbing UV light in the 270-340 nm wavelength range. Upon absorbing a UV photon, it undergoes a rapid, reversible internal conversion process that dissipates the energy as heat. This prevents the UV energy from initiating the damaging degradation chain reactions within the PVC matrix. The benzotriazole structure of UV-328 provides excellent photostability, meaning it can repeatedly absorb UV light without significant degradation itself, offering long-lasting protection.

Key Benefits of Using UV-328 in PVC Formulations

When you buy UV absorber UV-328 from NINGBO INNO PHARMCHEM CO.,LTD., you benefit from:

  • Effective UV Shielding: Provides excellent protection against UV-induced discoloration and degradation, critical for maintaining the appearance and structural integrity of PVC products.
  • Broad Compatibility: UV-328 demonstrates good compatibility with PVC, ensuring it can be easily incorporated into standard PVC processing techniques like extrusion and calendering.
  • Low Volatility: Its low volatility is advantageous during PVC processing, minimizing loss and ensuring consistent protection in the final product.
  • High Washing Resistance: This feature is vital for PVC products that might be cleaned or exposed to environmental moisture, ensuring sustained UV protection.

Sourcing Your PVC Stabilization Needs

For manufacturers seeking to enhance the performance and lifespan of their PVC products, UV Absorber UV-328 is a highly effective solution. Partnering with a reliable manufacturer and supplier in China like NINGBO INNO PHARMCHEM CO.,LTD. ensures you receive high-quality, pure UV-328 at competitive prices. Our commitment to quality and consistent supply chain management makes us an ideal partner for your PVC stabilization needs.

To ensure your PVC products withstand the effects of UV radiation and maintain their performance and appearance, consider incorporating UV Absorber UV-328. Contact NINGBO INNO PHARMCHEM CO.,LTD. today for detailed product information, sample requests, and bulk order quotations.