4. Insulating glass pathologies
Several optical phenomena can be observed in insulating glass. However, not all of them indicate a manufacturing defect in the glazing.
4.1 Brewster's colorful bangs
Brewster bangs are colored bangs resulting from the decomposition of light into rainbows. When surfaces are of very good quality, i.e. very flat and of uniform thickness, the different components of reflected white light, colored according to wavelength, interfere and, under natural light, produce a set of colored bangs that can be observed both by transparency and reflection.
Variations in air pressure inside the double-glazing unit cause the glass to take on a convex or concave shape, resulting in an imbalance of parallelism. By exerting slight pressure on one of the...
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Insulating glass pathologies
Other pathologies
Standards
- Glass in construction – Base products: soda-lime-silica glass – Part 2: ice - NF EN 572-2 - 2004
- Glass in construction – Thermally toughened soda-lime silicate safety glass – Part 1: definition and description - NF EN 12150-1 - 2000
- Glass in construction – Laminated glass and laminated safety glass – Part 1: definition and description of components: top-tin (surface tin grain); bottom-tin pick-up (tin bath face)...
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Building Encyclopedia. Published by Techniques de l'Ingénieur (no longer sold).
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