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Desiccant
A hygroscopic substance used as a drying agent in insulating glass units.
Dewpoint
A calculated temperature at which water vapor will condense.
Double glazing
Two panes of glass enclosing a hermetically-sealed air space.
Distortion
An optical effect obtained on the glazing surface.
Double Glazed Units
Two panes of glass enclosing a hermetically-sealed air space.
Design Heat Loss
The calculated ratio for heat which is transmitted from a warm interior to a cold exterior.
Dry Glazing
A glazing process which does not use chemical compounds, only dry, mechanical fixings.
dB
A unit of sound measurement.
Deflection
The term applied to the physical displacement of glass from its original position under load.
Dual sealed system
A primary seal of polyisobutylene and a secondary seal of polysulphide, polyurethane or silicone ensuring the effective and durable sealing of double-glazed units.
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