U-factor/U-value
U-factor or U-value is a number that represents the rate of heat loss through a window or door. The lower the number, the greater a window resists the transfer of heat. A U-factor of 0.35 or lower represents good insulating value.
Ultraviolet (UV)
UV refers to the type of rays outside of the visible spectrum (at its violet end). These rays are found in everyday sunlight and can cause fading or chalking of dark paint finishes. Extreme UV exposure can cause certain plastic materials to distort.
Unit
A unit normally refers to one single lite of insulating glass.
Uvekol
This is a type of glass laminating system used for impact-resistant glass.
