Betterial offers EVA films with tailored UV absorption – B610HP for high UV protection and B601P for enhanced light transmission
B601W combines a white embossed surface with over 91% reflectivity across 400–1,100 nm
All 3 films feature high mechanical strength, PID and acid resistance, and low moisture uptake
The 5th edition of TaiyangNews’ Backsheets and Encapsulation Market Survey received input from 17 companies, out of which 14 provided data for encapsulation materials. Betterial, a Chinese PV film manufacturer, is featured for the first time in this edition. It provided data for 3 EVA materials: B610HP, B601P, and B601W. While the majority of specifications are consistent across all 3 models, notable differences exist in their finishes and UV light management properties. B610HP is designed for high UV absorption, with >80% absorption in the 280 to 380 nm range, offering strong UV protection for module components. In contrast, the B601P minimizes UV absorption, with < 30% absorption in the same wavelength range. This distinction makes B610HP ideal for modules prioritizing UV protection, while B601P is better suited for scenarios emphasizing light utilization efficiency (see Optimizing Encapsulation For Next-Gen Solar Modules).
Unlike the transparent B610HP and B601P, B601W comes in a white finish with random embossing. It shares the same thickness and width ranges of 200 to 800 μm and 1,000 to 1,300 mm, respectively, but focuses on reflectivity. B601W reflects > 91% of light in the 400 to 1,100 nm range. It also provides < 1% UV light transmission in the 280-380 nm range. All 3 models share key mechanical properties, including a tensile strength of ≥ 16 MPa, elongation of ≥ 500%, and shrinkage of ≤ 3%. They also feature an adhesive strength of ≥ 60 N/cm to both glass and backsheet (see Encapsulation Sector Balancing Innovation And Cost Pressures In Solar).
Processing conditions for all 3 products include lamination temperatures of 140-155°C and crosslinking within 110-155°C. They contain 26-30% VA and 75-95% gel content, providing reliable encapsulation performance. Additionally, all 3 materials exhibit potential-induced degradation (PID) resistance, acid resistance, and low water absorption of <0.2 wt%.
The text is an excerpt from the latest TaiyangNews Market Survey on Backsheets & Encapsulation Materials 2024/25, which can be downloaded for free here.