Generally speaking, the degradation process of color coated sheets begins with loss of gloss, followed by gradual fading and chalking of the surface. In the later stages, the coating may peel and flake off, eventually leading to corrosion of the substrate.

In outdoor applications, one of the core triggers for fading and degradation of color coated sheets is the damaging effect of ultraviolet (UV) radiation from sunlight.

The damage mechanism of UV radiation on coatings operates on both chemical and physical levels.

On the chemical level, since the coating film itself is a polymer material, UV radiation in sunlight breaks its molecular chemical bonds, triggering chain chemical reactions that cause the originally vibrant color coated sheets to gradually fade and lose luster.

On the physical level, UV radiation accelerates the aging of the coating material, compromising the integrity of the coating.

To enhance the UV aging resistance of color coated sheets, Tianjin Xinyu has established a weathering test system centered on "laboratory testing + outdoor natural exposure sites + project application tracking." This system continuously iterates and optimizes product aging resistance, laying a solid foundation for product quality.

Laboratory Accelerated Aging Testing – Precisely Quantifying Quality

Tianjin Xinyu's CNAS Laboratory Testing Center is equipped with professional testing equipment including QUV ultraviolet aging testers, which simulate UV environments in sunlight to accelerate material aging. Through standardized, quantifiable experimental data, we verify the UV aging resistance of color coated sheets, providing reliable data support for product quality.

Taking Tianjin Xinyu's High Durability Polyester (HDP) color coated sheet as an example: For sample panels with an AZ150 substrate coating, coating thickness ≥20μm, and color Xinyu White, test results show that UV aging UVA-340 ≥2000 hours, with color change and gloss loss ≤ Grade 3. This fully demonstrates excellent color stability and durability, enabling the product to confidently withstand outdoor sun exposure.

Outdoor Natural Exposure – Confronting Nature's Challenges

Xinyu has built its own dedicated outdoor exposure test site, where color coated sheets with different coating types are placed in natural environments for exposure testing. We conduct long-term tracking and recording of coating fading, chalking, cracking, and corrosion conditions.

Project Application Tracking – Real-World Performance Monitoring

Xinyu has established a comprehensive long-term project tracking mechanism, continuously following up on the in-service performance of color coated sheets across various engineering projects, recording real-time long-term performance data of sheets under different geographical conditions and operating environments.

Precision Craftsmanship – Quality Assurance

Tianjin Xinyu color coated sheets are manufactured using a two-coat, two-bake production process, which forms a dense and uniform coating structure. This process not only ensures precise control over coating thickness but also guarantees strong adhesion between the coating and the substrate. Relying on advanced craftsmanship, we eliminate coating quality risks at the production source.

With over 20 years of deep expertise in the coated steel sheet industry, Tianjin Xinyu builds a solid quality foundation with dedicated craftsmanship, providing customers with stable, durable, high-quality coated steel sheet one-stop solutions.