Impulse
The amount of energy generated in an explosion. It can be either positive (impact force) or negative (suction force) energy. Impulse is measured by integration of the pressure / time curve recorded in an explosion.

Insulated Glass
Double insulating glass units consist of two panes of glass that enclose a hermetically sealed air space. The panes are held apart by a spacer around the entire perimeter. The spacer contains a moisture absorbent material called a desiccant that serves to keep the enclosed air free of visible moisture.

Laminated Glass
Laminated glass consists of two or more plies of glass interleaved with clear or tinted polyvinyl butyl (PF). The application of heat and pressure bonds the glass and plastic interlayer into one unit. When laminated glass is fractured, the particles of glass tend to adhere to the plastic, affording protection against flying or falling particles. Some combinations of glass and plastic thicknesses do qualify as safety glazing materials under the criteria of ANSI Z97.1-1984 and CPSC 16 CFR 1201.

Lite
A sheet or pane of glass.

Low-Emmissivity Glass
Low-emissivity coatings (Low-E) reflect that part of the heat spectrum above 3000 millimicrons wavelength that is called "sensible heat". The heat from hot water or steam radiators and the heat from hot air ducts from a furnace are typical examples of this kind of heat. These coatings have high visible light transmission. In fact, they are nearly invisible on the glass. The visible light transmission is typically about 20 percentage points below that of an equivalent uncoated glass. The major attribute of Low-E insulating units is their sensible heat reflecting character which is apparent from their low U-values. Low-E coatings are applied to glass by vacuum processes and by pyrolitic processes.

Luminescent Coefficient
The rate of visible light transmission and shading co-efficient (Ke ratio). This is a relationship between how much heat gain is rejected and the amount of visible light transmittal.