Topic: Safety Code And Performance

A measure of how much air passes through or around a window, door, or glazing system.

The common abbreviation for visible transmittance.

The amount of visible light that passes through glass or window film.

The common abbreviation for Solar Heat Gain Coefficient, a key rating for Arizona heat-control decisions.

A rating that measures how much solar heat passes through a window or glass assembly.

A rating that measures resistance to heat flow; higher numbers generally indicate better insulation.

A rating that measures how well a window or glass assembly resists heat transfer; lower numbers generally mean better insulation.

How glass behaves after it breaks, including whether it falls out, stays bonded to an interlayer, or breaks into smaller pieces.

A rare impurity in tempered glass that can contribute to spontaneous breakage after installation.

A crack caused by uneven heating or cooling across a glass pane, often seen when part of the glass is shaded and another part is hot.