Coveme, an Italian company, is known for its emphasis on non-fluoropolymer solutions but also offers traditionally laminated products incorporating fluoropolymers, particularly those based on Tedlar. Coveme has provided data for 5 new products for this survey, in addition to the 4 Tedlar backsheets that were part of the previous survey. These new products include 4 backsheets based on PVDF with varying compositions and one Tedlar-based frontsheet.
Coveme’s fluoropolymer range is based on Tedlar as the outer protective layer and the so-called ‘primer’ – i.e., polyethylene as the inner layer – both bonded with a PET core film. Obviously, the most interesting among these is the frontsheet – dyMat ClrFS TL 100/125 – which is also the latest, launched in 2024. The product is designed specifically for rooftop and distributed generation (DG) installations, including BIPV applications. This frontsheet is also compatible with semi-flexible and flexible module configurations, according to Coveme. The polymer composite has a PVF/PET/Primer structure, with an effective thickness of 280 µm ± 5%, and is available in widths ranging from 50 to 1,500 mm. Its transparency and dielectric thickness index (DTI) exceeding 150 µm make it particularly suitable for high-performance PV modules suitable for 1,000 V DC system voltage. The frontsheet offers a breakdown voltage greater than 18 kV and a WVTR of < 2.0 g/m²/d. It also has a flame spread index of < 100, ensuring fire resistance. An optional fluoro-based coating is available as a substitute for the standard primer.
Among the other new products, dyMat KF 285 and dyMat Clr KF 285 are 2023 models, both with a composition of PVDF, PET, and a specialized coating following the KPC configuration. dyMat KF 285 has an effective thickness of 316 µm ± 5% and comes in white on both sides. The backsheet meets the 1,500 V DC system voltage requirements with a breakdown voltage of > 20 kV. Clr KF 285 is a transparent version with a thickness of 324 µm ± 5%, particularly indicated for bifacial and BIPV. The WVTR of this backsheet is 2.5 g/m²/d.
A similar pair of products – dyMat KL 50/285 and dyMat Clr KL 50/285 – was also launched in 2022, also based on PVDF but using a primer as the inner layer. The former comes with an effective thickness of 370 µm ± 5%, and in white color on both sides. Clr KL 50/285, with an effective thickness of 375 µm ± 5%, is transparent and particularly suitable for bifacial and BIPV applications. Both these products have a breakdown voltage of > 18 kV and a water vapor permeability of less than 2 g/m²/d.
