Coveme’s fluoropolymer range includes 4 PVDF-based backsheets and a Tedlar-based frontsheet designed for BIPV and flexible module applications
dyMat KF and KL series products cover both opaque and transparent formats, offering breakdown voltages of 18 to 20 kV and moisture permeability below 2.5 g/m²/d
The dyMat ClrFS TL 100/125 frontsheet features a PVF-PET-Primer structure, dielectric thickness above 150 µm
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.
Out of the 6 previously listed Tedlar products, 2 were discarded, while the remaining 4 products have not undergone any changes. Of these, 2 are transparent backsheets promoted for bifacial applications and 2 are opaque. Introduced in 2020, the dyMat Clr TsL series of transparent backsheets is offered in 2 variants – dyMat Clr TsL 50/158 and dyMat Clr TsL 50/285. While what differentiates these 2 models is the effective thickness of the entire backsheet, the company has not provided the details for individual layer thickness. The former has an effective thickness of 253 µm and the latter 380 µm, making them eligible for 1,000 V and 1,500 V system voltages, respectively. Their ability to limit moisture ingression is the same, however, at a rate of 2 g/m²/d.
dyMat TsL 50/250 and dyMat TsL 50/285 models share the same backsheet composition and come in a standard white color for the front, while the rear can be opted for in white or black. dyMat TsL 50/285, thicker by 35 µm than the other, is designed for 1,500 V and has moisture barrier properties of 1.7 g/m²/d. TsL 50/250, on the other hand, has a 2 g/m²/d moisture ingression rate and is suitable for a system voltage of 1,000 V.
All Coveme products are packaged in rolls or sheets and can be stored for up to 2 years at 40°C and 65% RH.
For more fluoropolymer offerings from Coveme, refer to the product description section of the report. The text is an excerpt from the latest TaiyangNews Market Survey on Backsheets & Encapsulation Materials 2024/25, which can be downloaded for free here.