In the plastics and composites industry, exposure to ultraviolet (UV) radiation is one of the main factors that deteriorate the quality, appearance and resistance of end products. To combat this problem, UV filter additives are an indispensable element, as they provide efficient protection against damage caused by sunlight, thus prolonging the service life of various materials.

In this article, we will explore what UV filter additives are, their importance, and the specific benefits of outstanding products such as avanUV 37, avanUV 87, UV Absorber ES and UV-81/40. In addition, we will look at how these additives contribute to improved lightfastness in different industrial applications.

UV filter additives are chemical compounds designed to be incorporated into plastics, resins, rubbers, and other polymers, with the primary function of absorbing or blocking ultraviolet radiation that can damage and degrade these materials. Their action prevents UV light from penetrating deeply and triggering destructive processes such as photo-oxidation, yellowing, loss of mechanical properties, and cracking.

UV radiation generates free radicals that break polymer chains and initiate chemical reactions that negatively impact the structure and appearance of the product. For this reason, the integration of UV filters is essential for outdoor applications or environments with high sun exposure.

• Protection against photo-oxidation: Prevent materials from undergoing chemical degradation caused by the action of oxygen and UV light.

• Reduction of yellowing: Preserve the original appearance by preventing products from turning yellow over time.

• Crack resistance: Enhance flexibility and durability, preventing materials from cracking.

• Protection against radicals and ozone: Prevent additional chemical damage that accelerates material aging.

• Extended lifespan: Increase the durability and functional performance of products exposed to harsh environmental conditions.

avanUV 37 is a slightly yellowish liquid additive specially formulated for use in unsaturated polyester and vinyl ester resins. This product is ideal for applications in solid surfaces, gel coats, SMC, and BMC, among others.

What sets avanUV 37 apart is its multipurpose effect. In addition to filtering UV light, it provides protection against photo-oxidation, free radicals, hydrolysis, and ozone. This means it not only blocks UV radiation but also shields the material from multiple degradation mechanisms. As a result, finished products containing avanUV 37 exhibit significantly greater outdoor durability.

For the rubber sector, avanUV 87 is a solid (yellowish) additive designed to be incorporated into elastomers such as BR, NR, SBR, NBR, and EPDM. Its strength lies in its high resistance to extraction, especially in environments with constant water contact, ensuring long-lasting protection even under harsh conditions.

Like avanUV 37, avanUV 87 not only filters UV light but also protects against photo-oxidation, free radicals, and ozone, providing extended outdoor protection that enhances the lifespan and performance of rubber exposed to the elements.

UV Absorber ES is an innovative system that significantly enhances light resistance in unsaturated polyester resins. It uses advanced technology with cerium and zinc compounds that help accelerate reactions during curing, reducing the number of free chromophore groups responsible for yellowing.

This additive not only improves UV protection but is also highly effective against yellowing and cracking, outperforming traditional protectors based on benzophenone and triazine.

Solution UV-81/40 represents an advanced option among additives that protect against ultraviolet radiation, specially designed for incorporation into vinyl ester and unsaturated polyester resins. Its formulation has been carefully developed to offer easy, effective, and long-lasting integration in various industrial processes, without compromising thermal stability or the quality of the final product.

This additive is presented as a yellow solution and is ready for direct application, facilitating its use in production lines that require speed, uniformity, and precision.

The integration of UV filter additives into materials is not just an aesthetic matter but a strategic investment to extend the lifespan and ensure the performance of products, especially those intended for outdoor use or harsh environments.

Without adequate protection, materials undergo rapid deterioration, leading to additional costs for maintenance, replacement, and loss of value. UV filter additives help reduce these risks, ensuring that products retain their mechanical properties, appearance, and functionality for a longer time.