Backsheet laminates for solar modules

It is extremely important to us that only the best raw materials are used to produce our backsheet laminates, which helps to guarantee the proven Krempel quality over several decades.

We draw on our over 30 years of practical experience to select the optimal materials for our customers based on their particular applications. We work in close collaboration with our customers to optimise not only the efficiency of their solar modules but also their production processes.

Krempel backsheets undergo a comprehensive series of tests as well as accelerated age testing, where we go beyond the required minimum values of the relevant IEC specifications.

Our comprehensive standard, type approval and special tests are carried out on the backsheet as a standalone component or on complete dummy modules.

The classic laminates in our AKASOL® series use fluoropolymer film as the cell layer and the outer layer and have proven their worth over more than 30 years of use all around the world. They are available either with TEDLAR®-PVF films or KYNAR®-PVDF films. The range is also supplemented by cost-optimised versions. These versions still use a fluoropolymer film as the outer layer, but the side of the sheet closest to the cell is designed as a primer layer consisting of high-quality UV absorbers. The polyester films are combined with adhesion promoter in the optimal proportion to their thickness.

The Yellowing Index proves that fluoropolymer films are UV resistant on a long-term basis, and have the previously underestimated benefit of significantly inhibiting flammability and flame spread. For the electrically insulating inner layer, we use modified, dimensionally stable polyester films for all of our backsheet laminates in the AKASOL® series. This allows us to achieve the required partial discharge resistance for any system voltages required for the solar modules up to 1500 Volt. For buildings designed with integrated PV modules (BIPV), we provide backsheets that can be harmoniously incorporated into the architecture thanks to their approximating colours or transparent design.

Safety and reliability are the decisive factors when selecting materials for solar modules, but there is also a demand for more cost-effective alternatives on the solar market. We have found the perfect balance between our dedication to quality and the market requirements, and have developed the cost-effective AKALIGHT ECS® backsheet variants. These combine our tried-and-tested cell layers with a special UV-stable polyester film that is designed to be reliable when used in the outer layer in line with the discerning Krempel standards.

Thin-film solar modules need to be protected against the ingress of moisture. This is ensured by an additional barrier layer in the form of an aluminium inner layer. Thin-film modules have a cost-optimised design based on glass-film technology. They are resistant to water vapour ingress in accordance with ISO 15106-3.

Either a fluoropolymer film or a special UV-stable polyester film can be selected as the outer layer.

Our backsheets for thin-film modules are based on our tried-and-tested backsheets for classic solar modules.

In our backsheets for reverse-side contacting, the outer layer consists of a fluoropolymer film. A copper film is used to ensure optimal electrical contact with the side of the sheet closest to the cell. This innovative technology increases the efficiency of PV modules.