GLOSSARY
    Absorptance
    The amount that is taken into a medium.

    Deposition Process
    A form of physical vapor deposition (PVD) often used for deposition of metal films. Film is drawn through a
    tank containing metal ingots where a vacuum is created by reducing the pressure in the tank, which is then
    flooded with argon gas and the ingots are heated. The heat causes the metal to give up particles that
    migrate to the film's surface.

    Dyed Film
    Window film that uses either a submersion process or a dyed adhesive process to deposit dye onto its
    surface to achieve the qualities and look of tinted film.

    Emissivity
    The measure of surface's ability to absorb or reflect far-infrared radiation. The lower the emissivity rating,
    the better the insulating qualities of the window film/glass system.

    Hybrid Film
    Window film that is made up of a combination of metallic film and dyed film to achieve the qualities and
    look for tinted film.

    Infrared Light
    A form of electromagnetic radiation with wavelengths between 0. 7 micrometres (0.0007 millimetres) and 1
    millimetre. These wavelengths are longer than those of visible light, but shorter than those of microwaves.
    (The prefix 'infra' means 'below; infrared refers to radiation below the frequency of red light.) Infrared light is
    primarily thermal radiation, and we can think of this as being heat.

    Metallic Film
    Window film that uses either a sputtering process or deposition process to deposit metals onto its surface
    to achieve the qualities and look of tinted film.

    Polyester Film
    Polyesters are made from chemical substances found mainly in petroleum and are manufactured in fibers,
    films, and plastics. Polyester film (PETF) is a semi-crystalline film used in many applications such as
    videotape, high quality packaging, professional photographic printing, X-ray film, floppy disks, etc.

    Reflectance
    The amount that is bent or sent back by a medium.

    Shading Coefficient
    The ratio of solar heat gain passing through window film to the solar heat gain that occurs under the same
    conditions if the window were made of clear, unshaded double strength window glass. The lower the
    number, the better solar shading qualities of the window film/glass system.

    Solar Absorptance
    The percent of incident solar radiation that is absorbed by the window film/glass system. The lower the
    number, the less solar radiation absorbed.

    Solar Heat Gain Coefficient
    The ratio of total solar heat passing through a given window product relative to the solar heat incident on
    the projected window surface at normal solar incidence (I.E. Perpendicular to the glazing surface). The
    lower the coefficient number for a particular window film/glass system, the better it is able to reduce heat.

    Solar Reflectance
    The percent of incident solar radiation that is reflected by the window film/glass system. The lower the
    number, the less solar radiation reflected.

    Solar Transmittance
    The percent of incident solar radiation that is transmitted through the window film/glass system. The lower
    the number, the less the solar radiation transmitted.

    Sputtering Process
    A form of physical vapor deposition (PVD) often used for deposition of metal Films sputtering involves
    knocking metal atoms off a disc of pure metal with charged, energetic, chemically inactive atoms called
    ions (from a plasma). The metal atoms will re-deposit and build on top of polyester film .

    Total Solar Energy Rejected
    The percent of total solar energy (heat) rejected by the window film/glass system. The higher the number,
    the more total solar energy (heat) rejected.

    Transmittance
    The amount that is allowed to pass through a medium.

    U-Value
    The ability for heat to transfer through 1 square foot of window film for each 1° Fahrenheit difference in
    temperature. It is dependent upon the local climate or environment that the window is located in effects the
    level of heat transfer and the rate; in summer, heat transfers from the outdoor air to indoor air. In winter,
    heat transfers from indoor air to outdoor air. The lower the U-Value, the better insulating qualities of the
    window film/glass system.

    Ultraviolet Light
    Light having a shorter wavelength and higher energy than visible light. Ultraviolet light is potentially
    damaging to library, archive and museum objects. Removing UV light can reduce the rate of deterioration.
    Certain acrylic sheets have UV filtering chemicals built into them.

    Ultraviolet Transmittance
    The percent of ultraviolet light (UV) that is transmitted by the window film/glass system. The lower the
    number, the less ultraviolet transmitted.

    Visible Light
    electromagnetic radiation at wavelengths which the human eye can see. We perceive this radiation as
    colors ranging from red (longer wavelengths; ~ 700 nanometers) to violet (shorter wavelengths; ~400
    nanometers).

    Visible Light Absorptance
    The percent of total visible light that is absorbed by the window film/glass system. The lower the number
    the less visible light absorbed.

    Visible Light Reflectance
    The percent of total visible light that is reflected by the window film/glass system. The lower the number the
    less visible light reflected.

    Visible Light Transmittance
    The percent of total visible light that is transmitted through the window film/glass system. The lower the
    number the less visible light transmitted.