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PVDF coated aluminum roofing sheets are a widely used material in the construction industry, offering excellent weather resistance and aesthetics. PVDF aluminum roofing sheets are a high-performance roofing material based on aluminum sheet coated with a polyvinylidene fluoride (PVDF) fluorocarbon coating. They are widely used in buildings such as airport terminals, train stations, stadiums, and commercial facilities. PVDF (polyvinylidene fluoride) is a fluoropolymer widely used for aluminum coatings due to its superior chemical, UV and corrosion resistance.

Properties of PVDF Coated Aluminum Roofing Sheet:

1. Excellent weather resistance

The carbon-fluorine (C-F) bond energy in the PVDF coating's molecular structure is as high as 485 kJ/mol, making it difficult for UV rays to damage its structure. Therefore, even after 15-20 years of outdoor exposure, the coating maintains a gloss retention of ≥80% and a color difference of ≤2.0 (meeting AAMA 2605 standards). The surface is also resistant to discoloration, chalking, or cracking.

2. Strong corrosion resistance

The coating can withstand immersion in 5% hydrochloric acid and 5% sodium hydroxide solutions for 24 hours without change, and salt spray resistance for up to 4,000 hours without blistering, bulging, or chalking. PVDF coated aluminum sheet is suitable for corrosive environments such as coastal and chemical industries.

3. Self cleaning and gloss retention

The PVDF coating has a smooth and hydrophobic surface, making it difficult for dust to adhere. It cleans easily after rain, maintaining the aesthetic appearance of the building over time.

4. Flexible processing

Aluminum sheets can be processed into complex shapes, such as flat, curved, and spherical, to suit various architectural styles. It also supports various installation methods, including standing seam and flat lock.

5. A variety of colors:

PVDF coatings offer a variety of long-lasting, fade-resistant colors to suit various architectural styles.

6. Lightweight and high strength:

Aluminum is inherently lightweight and strong, and the addition of PVDF coatings does not significantly increase weight, making them easier to transport and install.

7. Environmentally friendly:

PVDF coatings are recyclable, meeting modern environmental standards.

8. Fire performance:

Although aluminum itself is a good fireproof material, it is important to pay attention to the fire rating of the coating and select the appropriate product to comply with building fire regulations.

Technical Parameters of PVDF Aluminum Roofing Sheet:

- Coating Thickness:

≥ 25μm for a two-coat process, ≥ 32μm for a three-coat process, to ensure long-term protection.

- Gloss:

A matte or matte finish below 40° is recommended to reduce light pollution.

- Adhesion:

Cross-hatch test: 0, circle test: 1, indicating a strong bond between the coating and the substrate.

- Hardness:

Pencil hardness ≥ HB, abrasion resistance ≥ 5L/μm, impact resistance ≥ 50kg·cm.

- Weather Resistance:

After 4000 hours of artificial weathering, color difference ΔE ≤ 4.0, gloss loss ≤ 2.

Application Scenarios of PVDF Coated Roofing Sheets:

- Long span roofing systems

For example, in airport terminals and train station stands, color coated aluminum roofing sheets are lightweight and high-strength, enabling unsupported, long-span designs.

- Special-shaped roof systems

Processed into special shapes such as spherical and S-shaped roofs, they meet the personalized requirements of artistic or iconic architecture.

- Decorative roof systems

Combined with aluminum veneer and solar panels, they enhance the aesthetics and functionality of buildings.

- Comprehensive roof systems

Integrate insulation, sound absorption, and moisture barriers to create a multi-layered protection system suitable for high-end commercial or public buildings.

In short, PVDF coated aluminum roof sheets, with their superior performance and aesthetically pleasing appearance, are an ideal roofing material choice for modern architecture.