The newest product of Otefal Group is Dfalz, aluminium rolled sheet with continuous liquid painting for coverings and roofing.
The paints used are Pvdf coatings with IR-reflecting pigments: the IR radiation is partly reflected and partly absorbed. While white and near white pigments are naturally IR-reflecting, darker pigments tend to have a high rate of IR absorption. The difference in surface temperature (and panel temperature) between a coating using standard pigments and on using special IR-reflecting pigments can range from app. 5°C for light colours to more than 10°C for dark colours (measured on north-facing roofing panels at an exterior temperature of 30°C).
Dfalz precoated roofing panels will have:
- lower operating costs, due to less maintenance and airconditioning
- lower installation costs, due to less insulation requirement
- longer service life
than panels using standard coating products, including PVDF coatings with standard pigmentation.
The UV radiation is destructive to many substances, including coatings, and it follows that in order to maximise the life of a coating, it should be as transparent as possible to UV light. PVDF coatings have this characteristic.
In densely constructed areas, Dfalz IR-reflecting panels will also contribute less to ozone creation, thus improving the air quality for the occupants and neighbours.
The manufacturing and the installation of the material must follow the sense of printed arrows on the protective film
angular lock welt |
double lock welt |
german method |
belgian method |
swiss method |
french method |
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