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Terminologies

Terminologies used in respect of Window Films (in alphabetical order):

EMISSIVITY (E):

Emissivity measures the surface’s ability to absorb or reflect far-infrared radiation. Far- Infrared radiation is that which is sensed by the body as heat. The lower the emissivity rating, the better the insulating quality of the material.

GLARE REDUCTION (GR):

Glare reduction is a measurement of the reduction in ‘visible light transmission’ after applying film to the window, as compared to the ‘visible light transmission’ earlier. (It is expressed as a %).

MIL THICKNESS:

Mil is the unit of measurement equal to one thousandth of an inch (0.001”). Mil thickness is used in to express the overall thickness of the window film product (1 MIL = 25 micron).

NIRB:

Near Infra Red Blocking.

PLY:

Ply is used to display the number of separate layers of polyester film that are used in the manufacturing process to make a particular window film. E.g. a 2-ply product would consist of two single layers of polyester film..

SHADING COEFFICIENT (SC):

Shading coefficient is the ratio of the solar heat gain through a given window system to that of a clear float glass of 1/8” (approx. 3 mm) thickness under the same test conditions.. Lower the shading coefficient number, better is the ability to reduce solar heat.

SOLAR ENERGY ABSORPTION:

Solar energy absorbed is the ratio of the amount of total solar energy directly absorbed by the window system to the amount of total solar energy falling on that window system. (It is expressed as a %).

SOLAR ENERGY REFLECTANCE:

Solar energy reflectance is the percentage of the amount of total solar energy directly reflected by the window system to the amount of total solar energy falling on that system.

SOLAR ENERGY TRANSMITTANCE:

Solar energy transmittance is the percentage of the total solar energy passing through the window system to the amount of total solar energy falling on that system.

SOLAR HEAT GAIN:

Solar heat is the sum of percentage of solar energy that is transmitted or absorbed and then re-radiated into the room.

TOTAL SOLAR ENERGY REJECTED (TSER):

Total solar energy rejected is the percentage of incident solar energy rejected by a window system which is = solar reflectance + that part of solar absorption which is re-radiated outward.

VISIBLE LIGHT TRANSMITTED (VLT):

Visible light transmitted is the ratio of visible solar energy (380 – 750nm) that passes through the glazing system to the total visible solar energy falling on the glazing system.

VISIBLE LIGHT REFLECTED (VLR):

Visible light rejected is the total percentage of visible light reflected by a glazing system that can be seen visually. GWF performance results includes Interior and exterior VLR specifications on all films.

ULTRAVIOLET REJECTED (UVR):

Ultraviolet rejected is the ratio of ultraviolet solar energy that is transmitted by a window system to the total solar ultraviolet energy falling on the glazing system. Note: UV energy is not visible to human eye and is mainly responsible for the degradation and fading of organic matter, upholstery, colors, etc.