Sinopont's portfolio includes pre-cure, standard-cure, and fast-cure EVA films, covering applications from high reflectivity to UV filtering
The 7100 model, launched in 2021, features full-spectrum reflectivity, wide process flexibility, and no overflow or wrinkling issues during lamination
Lamination temperatures span 130–170°C across products, with customizable thickness
China-based Sinopont, a dedicated encapsulation material supplier, has contributed data for 6 EVA products to the 2024/25 TaiyangNews Backsheets and Encapsulation Market Survey. The latest in the range is a white EVA called 7100. Introduced in 2021, this pre-cure model provides high reflectivity on the full spectrum. The most important benefit of the product, according to the company, is that it has no overflow or wrinkling issues during the encapsulation. The company also claims that the product supports a wide process window; however, the lamination temperature of 140 to 170°C is also supported by a few other models. The company recommends a vacuum time of 8 minutes and a press time of 8 to 13 minutes for this EVA. It has the highest tensile strength of the range at > 16 MPa in both directions and also a density range of 0.90 to 1.1 g/cm³. Shrinkage is < 3% in MD and < 2% in the TD direction.
Backsheet adhesion strength is given as 40 N/cm; however, the rest of the product range supports backsheet adhesion of 60 N/cm, while the glass adhesion of 60 N/cm is the same across the board. PO8110e and PO8510e are a set of standard-cure products introduced in 2020 with several similarities in their specifications: density of 0.89 to 0.93 g/cm³, > 10 MPa tensile strength in both directions and elongation of > 500% in both directions as well. The same VA content of 13.5% to 19% and gel content of 75% facilitate similar processing conditions – lamination temperature of 140 to 170°C with a recommended vacuum time of 4 to 8 minutes and a press time of 7 to 15 minutes. The only notable difference according to the listed specs is that PO8110e has no UV cut-off while PO8510e cuts UV at 350 nm with 20% transmittance for wavelengths between 280 and 380 nm.
In addition to these 2 products, Sinopont is offering another standard-cure product called EVA9130W, introduced in 2014. All 3 standard-cure products have the same shrinkage rate of < 3% in the MD direction and < 1.5% in TD. This product has the lowest tensile strength of > 6 MPa across the range and the lowest elongation of > 40%. It also exhibits a low UV cut-off at 320 nm and quite a narrow process temperature window of 145 to 155°C.
EVA9110T and EVA9120B, also introduced in 2014, are the only set of fast-cure class products from the company. Both these products have a tensile strength of > 10 MPa and elongation at break of > 550%. The VA content of the films is 28% and gel content is 75% to 95%. The product group supports a lamination temperature of 130 to 150°C, a vacuum time of 4 to 8 minutes and a press time of 8 to 13 minutes. The difference again is the UV cut-off: EVA9110T, with no UV cut-off, exhibits 91% light transmittance, whereas EVA9120B has a UV cut-off at 320 nm.
All of Sinopont’s products have a standard thickness of 450 μm but can be availed in a range of 200 to 800 μm; a standard width of 1,100mm, but widths between 300 and 2,200 mm can also be opted for. Water absorption at 20°C of 0.1% is also the same for all products except EVA9130W, which is rated at 0.2%. The water resistivity of this model, which is also the same for 7100, is slightly lower at 1 × 1014 Ω cm, while the remaining 4 products of the company are rated at 1 × 1015 Ω cm.
For detailed information on Sinopont’s offerings, please refer to the product description section of the report, which outlines specifications for all EVA-based materials.
The text is an excerpt from the latest TaiyangNews Market Survey on Backsheets & Encapsulation Materials 2024/25, which can be downloaded for free here.