1.What is the "self-cleaning" effect of galvanized color-coated coils?
This is actually a special function of the coating: the surface is not easily contaminated by pollutants, and rainwater can easily wash away dust, preventing stains from accumulating and leaving unsightly watermarks. The self-cleaning effect has quantifiable standards: according to the national standard GB/T12754-2019, the color difference (△E) against carbon black contamination should be ≤1.0, and the water droplet contact angle should be ≤60°.
2.How is self-cleaning achieved?
The mainstream self-cleaning technology utilizes the principle of "superhydrophilicity." A special coating gives the surface of the board a strong hydrophilicity. When it rains, the rainwater doesn't form droplets but spreads into a uniform "water film," penetrating between dust and the board, thus carrying away contaminants. The entire process requires no manual or chemical cleaning agents.
3.How long does the self-cleaning effect last?
This depends on the type and quality of the coating and the environment. Top-tier products promise a self-cleaning effect of up to 30 years and an aesthetic lifespan of up to 50 years. Typical self-cleaning color-coated panels usually come with a 10-20 year warranty. Durability is also affected by environmental factors such as industrial acid rain.
4.How to judge the quality of self-cleaning performance?
Besides referring to the manufacturer's test reports and warranty period, pay close attention to two national standard indicators: contact angle ≤ 60° (indicating water can spread and form a film) and carbon black contamination resistance color difference ΔE ≤ 1.0 (indicating resistance to contamination). When purchasing, also ensure that the product complies with the national standard GB/T12754-2019 or the group standard T/CECS 10352-2023.
5.What are the advantages of self-cleaning color-coated steel sheets compared to ordinary color-coated steel sheets?
Long-lasting cleanliness, maintenance-free: Utilizing rainwater for self-cleaning, eliminating the need for regular manual cleaning and reducing maintenance costs.
Maintaining appearance and delaying aging: Effectively reduces pollution from industrial exhaust gases and dust, prevents stain penetration, and maintains vibrant colors for a long time.
Strong weather resistance and longer lifespan: Self-cleaning coatings are usually combined with high weather resistance, providing better protection against ultraviolet rays and acid rain, protecting the sheets and extending their service life.