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The ratio of the amount of total solar energy in the full solar wavelength range (300-2,500 nanometers) that is allowed to pass through a glazing system to the amount of total solar energy falling on that glazing system. The value is expressed as a percent.
The ratio of total solar energy which is reflected outwardly by a glazing system to the amount of total solar energy falling on the glazing system. On filmed windows, this reflectance is a function of the side of the film facing the exterior of the building. The value is expressed as a percent.
The ratio of the amount of total solar energy absorbed by a glazing system to the amount of total solar energy falling on the glazing system. Solar absorption is that portion of total solar energy neither transmitted nor reflected.
The ratio of the amount of total visible solar energy (380-780 nanometers) that is allowed to pass though a glazing system to the amount of total visible solar energy falling on the glazing system. The value is expressed as a percentage and is photopically weighted to account for the greater sensitivity of the human eye to the center region of the visible spectrum.
The ratio of the amount of total visible light (380-780 nanometers) reflected by a glazing system to the amount of visible light falling on that system. This value is expressed as a percent. The higher the visible reflectance of a glazing system, the more mirror-like its appearance. Visible reflectance values may be given for the interior or exterior side of the glazing system.
The overall heat transfer coefficient of the glazing system, U-Value is a measure of the heat transfer that occurs through the glazing system and its outer and inner surfaces. This value is a function of temperature, and it is expressed in BTU per square foot per hour per degree-Fahrenheit (BTU/sq.ft./hr/*F). The lower the U-Value, the better the insulation qualities of the glazing system. This value is measured at 0*F outdoors, 70*F indoors and with a 12 mph wind.
Shading coefficient (SC) is the ratio of the total amount of solar energy that passes through a glazing system relative to 1/8-inch clear glass under the same design conditions. It includes both solar energy transmitted directly plus any absorbed solar energy re-radiated and convected. Lower shading coefficient values indicate better performance in reducing solar heat gain.
The ratio of the amount of total UV solar energy (280-380 nanometers) that is not allowed to pass directly through a glazing system to the amount of total UV solar energy falling on the glazing system. Ultraviolet is one portion of the total solar energy spectrum which greatly contributes to fading and deterioration of fabrics and furnishings.
The measure of a surface's ability to emit long-wave infrared radiation or room temperature radiant heat energy. The lower the emissivity the better the window's insulating performance. Low emissivity films reflect radiant heat back into the room, helping to lower heating costs.
Measures how well a window system blocks heat caused by sunlight. SHGC is the total fraction of incident solar energy that passes through a glazing system, directly and indirectly, via direct transmission or indirectly via conduction, convection, and re-radiation of absorbed solar energy. The lower a window's solar heat gain coefficient, the less solar heat is admitted.
The total percentage of incident solar energy that is prevented from passing directly or indirectly through a glazing system.
The ratio of visible light transmittance (in decimal form) to the solar heat gain coefficient. Films with values approaching or exceeding 1.0 reject a larger percentage of solar heat from the infrared portion of the solar spectrum rather than from the visible light portion.
The percentage by which incoming solar heat energy is reduced by the addition of a filtering material. The higher this number, the greater heat gain is reduced.
The percentage by which heat energy loss through a given glazing system is reduced by the addition of an insulating material. The greater this number, the better.
The percentage by which visible light is reduced by the addition of a light filtering material.
The force per unit cross-sectional area required to break (under tension) a film. The units given are pounds per square inch.
The force per unit width required to break (under tension) a film. The units given are pounds per inch.
The force per unit width required to pull film away from glass surface, at either 90* or 180* to glass surface. The units given are pounds per inch.
The percent increase in length of a film sample at the point of separation when tested for break strength.
The force (in pounds) required to puncture a film with a specified test probe.