PRESERV 1 WD and WV (white) and TF and TV (transparent) products are based on PVDF and Tedlar with PET thicknesses of 150, 190, or 280 µm
Water vapor permeability is 1.6 g/m²/d for PVDF white, 1.7 g/m²/d for Tedlar white, and 2.0 g/m²/d for transparent variants
Mechanical properties are consistent across all variants, with ≥90 MPa tensile strength, 90% elongation, and 10 N/mm EVA peel strength
RenewSys, an India-based polymer solutions provider and vertically integrated PV manufacturer, continues its participation in the TaiyangNews Backsheets and Encapsulation Market Survey 2024/25 with detailed data for 4 fluoropolymer-based product groups under its PRESERV 1 range. These include combinations of PVDF and Tedlar outer layers in both opaque and transparent formats, structured with varying PET core thicknesses to meet different module design and performance requirements.PRESERV 1 WD is a white backsheet based on PVDF outer films and is available in 3 subcategories differentiated mainly by the PET core film thickness, while the 22.5 μm PVDF film thickness is the same across the range. PRESERV 1 150WD, as the name indicates, is built with a 150 μm PET. Similarly, the PRESERV 1 190WD uses a 190 μm PET, while the inner primer film thickness of 100 μm is the same for both these models. However, PRESERV 1 300WD is a bit of a misnomer, in that it uses a 280 μm PET and a thinner primer layer of 50 μm.
The same product categorization formula is also applied to the Tedlar-based backsheet PRESERV 1 WV, which is also offered in 3 further variants – PRESERV 1 150WV, PRESERV 1 190WV and PRESERV 1 300WV – that use PET core thicknesses of 150 μm, 190 μm and 280 μm, respectively. PRESERV 1 300WV also uses a thinner primer film of 50 μm, just like the 300WD model above. The difference here is that the Tedlar layer has a thickness of 25 μm.
Apart from the outer layer chemistry, the other difference between the 2 series is in their WVTR spec – 1.7 g/m²/d for the Tedlar-based “WV” products and 1.6 g/m²/d for the one using PVDF.
PRESERV 1 TF is part of the company’s transparent backsheet range based on PVDF. This product is available in 2 versions – PRESERV 1 150TF with a 150 μm PET and a 100 μm primer, and PRESERV 1 300TF with a 280 μm PET and a 50 μm primer. The outer PVDF film thickness is common for both at 22.5 μm. These backsheets have an effective thickness of 365 μm and 484 μm, respectively, and a water vapor permeability of 2 g/m²/d.
The water vapor permeability is also the same for a similar product series of the company, PRESERV 1 TV, which is offered with Tedlar as the outer layer. With the 25 μm Tedlar layer thickness being the same, the PRESERV 1 150TV uses a 150 μm PET and a 100 μm primer film, while the PRESERV 1 300TV is built with a 280 μm PET and a 50 μm primer film.
Mechanical properties for all RenewSys products are the same. The tensile strength is given as ≥ 90 MPa, and elongation at break is 90%. Shrinkage in the MD direction is ≤ 1.5% and ≤ 0.5% in the TD direction. EVA peel strength is 10 N/mm, and inner layer adhesion is emphasized with a peel strength of 0.5 N/mm. As for the performance characteristics, all 4 product groups have both 1,000 V and 1,500 V system voltage products, with the thickest of each series mostly for 1,500 V. The transmittance of transparent backsheets is 90%, while the reflectivity of white backsheets is given as 80%.
The text is an excerpt from the latest TaiyangNews Market Survey on Backsheets & Encapsulation Materials 2024/25, which can be downloaded for free here.
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