AKASOL®: The strong backbone for photovoltaic modules
Our backsheet laminate AKASOL® is a combination of polymer films and fluoropolymer films, for example, TEDLAR®-PVF Film and KYNAR®-PVDF Film. It is distinguished by excellent mechanical, electrical and chemical properties as well as an extraordinary weather resistance. AKASOL® hence provides an effective shield against UV radiation and moisture over the decade-long service life of the PV modules.
- Product family specially developed for photovoltaic engineering from combinations of various polymer films (PVF, PVDF, ETFE, PET, modified PET). Also available with aluminum foil as moisture barrier or copper foil for the interconnection of back- contact solar cells.
- Long service life and constant product quality guaranteed by ISO/TS 16949 and ISO 9001. The requirements of IEC 61730-1 and IEC 60664-1 are greatly exceeded. AKASOL® types are also acknowledged as “UL Recognized Component” (File No. QIHE2.E312459).
AKASOL® basic properties
AKASOL® laminates vary in structure. Polyester films are dimensionally
stable and therefore used in thickness grades ranging from
50 μm to 330 μm for the inner layer (core film) in order to attain the
required stability for partial discharge (PD). The current standard
application is 1000 V for maximum system voltage or adaptable
for modified voltage requirements.
Fluoropolymer films are the best choice to protect the core films
against UV radiation. Since 2007,
a 25μm-thick, non-oriented
Gen2-TEDLAR®-PVF film is in use next to the previously used 37.5 μm oriented Gen1-TEDLAR®-PVF-film. KYNAR®-PVDF film has proved to be an equivalent alternative to PVF film. The various UV-shielding films are usually laminated to both sides of the core film. On request, however, we also supply dual layer
versions with one UV-stabilized primer layer.
AKASOL® product overview
For optical reasons, it is common practice to cover the connector strings with small strips which come in the same color as the backsheet laminate. All AKASOL® types are available for this application on reels cut to size.
A repair tape is available in case minor damages should occur to the laminated backsheet film during transport or installation of the PV modules. Subsequent to cross-linking they can be laminated cold and are then resistant to moisture and temperature.
On request, a combined laminate including a copper layer is available as a basic material for back-contact solar cells. Laminates are also available in smaller dimensions for special modules, e.g. mains independent solutions in special formats.
AKASOL® delivery forms, storage stability and processing
Laminates are delivered either on reels or as pre-cut pieces, either with or without punch cuts. Characteristic widths are 810, 1,000 and 1,650 mm. The maximum width amount is up to 2,500 mm.
The shelf life of AKASOL® in dry places at room temperature is six months. No special requirements must be used to laminate the encapsulation polymers. The recommendations of the manufacturers of the respective encapsulation polymers are the manufacturing parameters which apply to the vacuum lamination process.
AKASOL® product properties
| AKASOL®
types |
PTL
3-38/75 TWH |
PTL
3-38/250 TWH |
PTL
3-25/250 TUT |
PTL
3 HR 750 V |
PTL
3 HR 1000 V |
PVL
1000 V |
PVL 2-
1000 V + Primer |
PVAPL
1000 V + Primer |
| Material composition | PVFextr
PET PVFextr |
PVFextr
PET PVFextr |
PVFextr
PET PVFextr |
PVFcast
PET PVFcast |
PVFcast
AI PET |
PVDF
PET PVDF |
PVDF
PET |
PVFcast
AI PET |
| Dimensional stability
(MD / TD) 1) |
<1% | <1,2% | <1,2% | <1% | <1,1% | <1,1% | <1,2% | 0% |
| EVA peel strength | >4 N/mm | >4 N/mm | >4 N/mm | >4 N/mm | >4 N/mm | >4 N/mm | >4 N/mm | >4 N/mm |
| Interlaminare peel strength | 2) | 2) | 2) | 2) | 2) | 2) | 2) | 2) |
| Water vapor permeability | 1,5 g/m²d | 0,8 g/m²d | 0,8 g/m²d | 1,3 g/m²d | 0,8 g/m²d | 0,9 g/m²d | 0,6 g/m²d | 0 g/m²d |
| Breakdown voltage | >14 kV | >28 kV | >28 kV | >15 kV | >30 kV | >28 kV | >22 kV | >10 kV |
| Maximum system voltage | >750 V | >1.000 V | >1.000 V | >750 V | >1.000 V | >1.000 V | >1.000 V | >1.000 V |
1) 150 °C over 30 min 2) Failure of film before delamination
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