Jul . 21, 2025
The solar backsheet serves as the critical protective layer in photovoltaic modules, safeguarding internal components against environmental factors while ensuring long-term performance. As solar technology evolves, the materials science behind solar backsheets has progressed significantly, particularly in fluoropolymer-based solutions offering enhanced durability.
With over 15 years of specialized manufacturing experience, Baoding Lekai International Ltd. stands at the forefront of solar backsheet film technology. Located at No. 6, Lekai South Street, Baoding, Hebei, China, the company delivers certified PV protection solutions to global markets.
Global installations of solar PV continue record-setting expansion, with Wood Mackenzie projecting 1.3 terawatts of cumulative capacity by 2024. This exponential growth intensifies demand for reliable backsheets engineered to withstand 25+ years of UV exposure, thermal cycling, and mechanical stress.
Traditional solar backsheet configurations evolved from simple polymer laminates to sophisticated multilayer structures:
The Lucky Cpct1 Solar Backsheet exemplifies contemporary material engineering with its fluorinated coating technology ensuring reliable adhesion and thermal stability under varying operating conditions.
Performance parameters define solar backsheet selection criteria across different climate zones:
| Parameter | Standard Range | Testing Standard | Critical Importance |
|---|---|---|---|
| Thickness | 190-450 μm | IEC 61215 | Mechanical durability |
| Dielectric Strength | ≥15 kV | IEC 60664-1 | Electrical insulation |
| Water Vapor Transmission | ≤1.5 g/m²/day | ASTM E96 | Hydrolysis resistance |
| UV Resistance (1000hrs) | ΔE ≤ 5, Gloss ≥85% | IEC 62788-2 | Long-term stability |
| Thermal Cycling | 200 cycles, ≥85% adhesion | IEC 61215 | Thermal stress durability |
| CTE (x/y direction) | 10-70 ppm/°C | ASTM D696 | Dimensional stability |
Material selection remains pivotal in solar backsheet performance. The most common structures include:
This innovation provides reliable adhesion & thermal stability through fluorinated coating technology. Specifically engineered for high-humidity environments and extended UV exposure applications.
Key Advantages:
Rigorous quality testing ensures international compliance:
Contact us directly for third-party test reports and technical specifications documentation.
The demands placed on the backsheet of solar panel systems vary considerably across installation environments:
EVA-based solar backsheets utilize ethylene-vinyl acetate as a core dielectric layer, providing strong moisture barrier properties with cost efficiency. However, high-performance installations increasingly use fluoropolymer-coated variants like Lekai's CPCT1 series, which extend module lifetime by 40% in high-UV environments, according to Fraunhofer ISE accelerated aging tests.
Desert installations require solar backsheets that maintain performance at sustained 85°C+ operational temperatures. Critical evaluation parameters include: post-thermal adhesion strength (≥8N/cm), yellowness index change (ΔYI≤3 after 3000hrs), and insulation resistance stability through IEC TS 62788-7-2 differential scanning calorimetry analysis.
Modern PV backsheet components must comply with UL 1703 (fire safety), IEC 61730 (module construction requirements), IEC 61215 (design qualification), and IEC TS 62788-2 (material qualification sequences). Region-specific certifications include CQC China, JET Japan, and BIS India. Lekai's quality management system maintains certifications across all major markets.
Bifacial configurations require specialized transparent backsheets with >93% light transmittance while maintaining the mechanical properties of opaque variants. Installation frameworks must accommodate backside irradiation without compromising structural stability. New PID-free transparent backsheet designs prevent potential-induced degradation inherent in conventional solutions.
High humidity zones (tropical coastal regions) necessitate backsheets with water vapor transmission rates (WVTR) below 1.5g/m²/day to prevent hydrolysis. Fluoropolymer-coated options like Lekai's CPCT1 achieve ≤1.0g WVTR while maintaining hydrolytic stability beyond 2,000 hours per IEC 62788-5-1 humidity freeze testing protocols.
Floating photovoltaic systems require solar backsheets with enhanced hydrolytic resistance and anti-microbial surface treatments. Leading solutions feature hydrophobic nanocoating technologies that reduce soiling accumulation while preventing moisture ingress. Lekai's marine-grade formulations exceed standard hydrolysis resistance by 300% based on accelerated testing protocols.
Procurement specifications should include third-party certification documentation (UL, TÜV), 2000+ hours damp heat test results (IEC 61215), UV preconditioning data (IEC 62788-2 sequence B), and material composition analysis (FTIR verification). At Lekai International, all solar backsheets ship with batch-specific quality control reports documenting >45 material parameters.
Baoding Lekai International Ltd. provides tailored photovoltaic protection materials for your specific climate requirements and installation parameters.
Contact Our Technical Team
Phone: +86 312 7922835 | Email: caozhiqiang@lkintl.com
Address: No. 6, Lekai South Street, Baoding, Hebei, China
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