In outdoor engineering, what frustrates owners most is often not the failure of anti-corrosion, but the rapid "appearance" collapse. Originally bright red machinery turns light pink, and dark blue steel structures turn grayish white. This phenomenon is called Chalking and Fading in the industry.
As an industrial paint manufacturer, we break down for you the hidden standards that determine the service life of the paint film:
1. Why does it fade? Ultraviolet light is the culprit The ultraviolet rays (UV) in sunlight break the chemical bonds of the paint film molecules.
- Low-end paint: The molecular structure is unstable and breaks down rapidly under UV exposure, leading to loss of color molecules and the formation of a white powdery layer on the surface.
- High-end paint: Features stable chemical long chains (such as the C-F bonds in fluorocarbon paint), which can "immunize" against UV attack.
2. Understanding Weather Resistance Grades: ISO 12944 and Color Retention When selecting a topcoat, don't just look at the unit price—look at how long it can last:
- Standard grade (1-3 years): Suitable for indoor or temporary facilities, such as alkyd paint.
- Standard grade (5-8 years): Suitable for ordinary urban outdoor environments, such as acrylic polyurethane topcoat.
- Long-lasting grade (15-20 years or more): Suitable for strong UV radiation and high salt spray environments, such as PZSSS fluorocarbon topcoat (PVDF) or polysiloxane coating.
3. Key Metric: Gloss Retention Manufacturer laboratories usually use "Accelerated Weathering Test (QUV)" to evaluate weather resistance.
- Professional data: After 1000 hours of QUV testing, a high-quality topcoat can still maintain a gloss retention rate of over 80%. This means that in real outdoor environments, it can resist fading for several years.
4. Manufacturer's Advice: How to Avoid the Tragedy of Fading?
- Select coating by region: For high-altitude, strong UV regions such as Tibet and Xinjiang, fluorocarbon systems must be mandatorily used; coastal southern areas need to balance weather resistance and salt spray resistance.
- Use only genuine OEM colorants: On-site randomly mixed paints are prone to uneven fading due to unstable colorant quality.
Conclusion: Weather resistance is not a falsely advertised figure, but a real, tangible cost. Choosing industrial paint that meets environmental grade standards not only protects equipment, but also sustains a company's brand image over the long term.