Quality of Vision – A GGF Guide
15A common sense approach needs to be taken and an understanding that modern processed glass is not going to be flawless, as glass is for looking through not looking at.
Sealed Units
Glass used in the manufacture of sealed units is similar to that used traditionally for single glass and will, therefore, have a similar level of visual quality.
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How to do a Professional Inspection
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What to Expect when Carrying Out an Inspection
The obtrusiveness of blemishes is judged by looking through the glass, not at it, under natural light. It must be understood that the glass used in sealed units is a processed glass, and as a consequence, blemishes are to be expected.
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Special Glasses
Laminated glass may have a few more blemishes due to it being made of several layers. Some low emissivity coatings may produce transient visual effects. In some lighting conditions the coating may look like a transparent film or produce a haze, i.e. a cloudy look to the surface. When light coloured objects such as net curtains are placed close to the glazing they may look slightly darker. |
Condensation
Multiple Reflections This occurs in certain light conditions and is caused by multiple surface reflections within sealed units which may vary from pane to pane. |
Brewster’s Fringes – the Rainbow Effect
Patterned Glass This document does not apply to patterned glass as its manufacturing process is different. |
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