Glass and Glazing
Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
Showing changes from Rev 5
to Rev 6
in Glass and Glazing.
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title: Glass and Glazing
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## Glass is simultaneously a structural element, an environmental separator, a safety component, and an architectural finish. {note}
−## A single lite must resist wind and snow load without breaking, survive thermal stress from differential heating, satisfy safety-glazing requirements where it occupies a hazardous location, deliver the energy performance the building's compliance documents require, and present an acceptable visual appearance free of distortion, haze, and edge defects. {note}
+## A single lite must resist wind and snow load without breaking, survive thermal stress from differential heating, satisfy safety-glazing requirements where it occupies a hazardous location, deliver the energy performance the building's compliance documents require, and present an acceptable visual appearance free of distortion, haze, and edge defects.
## These requirements cross-couple: the heat treatment selected to resist thermal stress changes the glass type factor used in the load-resistance calculation; the coating selected to reduce solar heat gain changes the surface that must carry it within the insulating glass unit; the laminated interlayer chosen for safety or acoustics changes the unit weight and the glazing-pocket bite. {note}
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### Low-emissivity (low-e) coatings reduce radiative heat transfer across the IGU air space, lowering the U-factor; spectrally selective low-e coatings additionally reject solar infrared, lowering the SHGC while retaining visible transmittance. {note}
−### Coatings are produced by two processes: pyrolytic ("hard-coat"), applied at the float line and durable enough for monolithic and exposed use; and magnetron-sputtered vacuum deposition ("soft-coat"), which offers higher performance and more neutral color but must be enclosed within a sealed IGU and, for most products, requires edge deletion at the unit perimeter. {note}
+### Coatings are produced by two processes: pyrolytic ("hard-coat"), applied at the float line and durable enough for monolithic and exposed use; and magnetron-sputtered vacuum deposition ("soft-coat"), which offers higher performance and more neutral color but must be enclosed within a sealed IGU and, for most products, requires edge deletion at the unit perimeter.
### Low-Emissivity Coating Type Datasheet {toc}
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## Blanket exclusions for spontaneous breakage of tempered glass shall not be accepted where heat-soak treatment was required and performed; the warranty shall cover spontaneous breakage of heat-soaked tempered glass attributable to nickel-sulfide inclusions for the warranted term.