ALUCOBOND Verarbeitung - Ravago

INFORMATION ON SPECIAL SURFACESMill-finished surfacesWhen using ALUCOBOND ® panels with mill-finished surfaces that arenot protected from atmospheric influences through coating or anodising,a variation in the appearance of the aluminium surface must be takeninto account.The untreated, mill-finished aluminium surface – on which no decorativedemand should be made, acquires a natural oxide layer; in the courseof time the thickness increases to approx. 0.1 µm under the influence ofthe outer atmosphere.When coated with reaction products, the surface shows a reducedreflectivity compared to its state when new, i.e. the surface loses itsmetallic brilliance taking on a dull, light-grey appearance. This impressionis enhanced by dirt sedimentation in and on the surface. However, thisgreying is frequently viewed as positive.Whereas the reactions of uncoated aluminium to atmospheric influenceschange the appearance of the surface, the stability of the ALUCOBOND ®panel is not impaired, as the reactions only have an effect on the panelsurface, and the oxide layer protects the material underneath from anyfurther corrosion.It is virtually impossible to clean untreated, aluminium construction parts inexterior architecture, but this is not necessary as a rule, due to the readilyaccepted surface change and also its high resistance to weathering.The protective film should not be removed until all the necessary workhas been completed. After removal, make sure to wear gloves, as thiswill avoid leaving any finger prints that are almost impossible to removeafterwards.8 Edition 1 ALUCOBOND ® Processing and Technical Data GB