| Information about sun protection - internal or an external a |
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The question, whether to use a sun protection film for an internal or an external application depends on the following factors: first, shielding the sun rays from the
outside is the most effective method. The disadvantage is the shorter service life (max. 10 years). All kinds of glass (i.e. floatglass, ESG, VSG, wired glass, insulation glass) can be coated with sun protection film for external application. With the sun protection films for internal application it looks different. All glasses may be coated from the inside; except double glazed windows (i.e. insulation glass) manufacturerd in the past with a k-value higher than 3.0 W/m²K or more precisely insulation glass which had been manufactured within the last 10 years since the standards in the meantime is 1.1 W/m²K.These are conditions which became manifest through the last heat insulation ordinance. These so-called heat protection insulation glasses (k-value higher than 3.0 W/m²K) are already coated. This glass achieves a better heat insulation than 3.0 W/m²K, due to its preset applied metal vaporisation. Should this glass now be internally coated with a sun protection film, a multiple reflection of sun rays in the glass takes place and the cavity within the double-glazing panes needlessly heats up. This implicates that the edge bond of the insulation glass pane can shear off through volume extension and the insulation glass unit will become untight or even the pane breaks. Before ordering IFOHA sun protection films please verify the glass quality. Adhesion sun protection films on sun protection or heat protection insulation glass. We recommend the application of sun protection films for external use in order to avoid strains in the glass. For standard insulation glass, (i.e. k-value 3.0 without preset vaporisation), and single-sheet glass, sun protection films for internal use can be bonded. Tip: In order to establish whether it concerns heat protection glazing, (i.e. k-value higher than 3.0) please hold a lighter from inside before the insulation glass pane. If there is one flame of its reflective copies in the glass in terms of colour different than the others, you know it is heat protection glass. Look in the cavity within the double-glazing panes at the silver spacer. If you can see a stamp (i.e. k-value 1.6, or k-plus, ISO-plus,...-therm) it is vaporised glass and you have to bond it from the outside. If the glass is less than 6-7 years old, you should bond it from the outside. Please note that the selecting of a sun protection film regarding shielding, the personal taste is important since every body has to decide between maximum shield and minimum dimming. |
