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DD

DYNAMIC ELONGATION TEST

Elongation or stretching of a material under continuous movement.

DSE SEALANTS

A sealant that exhibits properties of high structural strength and low moisture vapor transmission rates.

DRY GLAZING

A method of securing glass in a frame by use of a dry, preformed resilient gasket, without the use of a compound.

DOUBLE-HUNG (WINDOW)

A window consisting of two sashes of glass operating in a rectangular frame, both the upper and lower halves can be slid up and down and usually use a counter balance mechanism to hold the sash in place.

DOUBLE GLAZING

In general, any use of two thicknesses of glass, separated by an air space, within an opening, to improve insulation against heat transfer and/or sound transmission. In factory-made double glazing units the air between the glass sheets is thoroughly dried and the space is sealed airtight, eliminating possible condensation and providing superior insulating properties.

DEW POINT

The temperature at which the condensation of water vapor in a space begins, at a given state of humidity and pressure, as the temperature is reduced. Used in testing sealed insulating glass. The lower the number, the higher the resistance to forming condensation.

DESICCANT

An extremely porous crystalline substance used to absorb moisture from within the sealed air space or an insulating glass unit.

DECIBEL

A unit for expressing the relative intensity of sounds on a scale from zero for average least perceptible sound to about 130 for the average pain level.