Specifications

Glossary of terms for Film Specifiers Guide

• Total Energy rejection (Heat) When solar radiant energy strikes the exterior of a window, the energy is reflected, absorbed/ or transmitted. The total of the three parameters adds up to 100%.
• SHGC stands for Solar Heat Gain Coefficient and measures how well a product blocks heat caused by sunlight. SHGC is expressed as a number between 0 and 1, the lower a windows SHGC, the less solar heat it transmits.
• Visible light transmitted - A ratio of the human eye weighted average daylight that is transmitted through the window to that which is incident upon the window.
• Visible light Reflected - Visible light is defined as the portion of the solar energy spectrum under average daylight conditions that is visible to the human eye. Values given are based upon the response of the human eye. The ratio of that which is reflected away from the surface of the window to that impinging on it is called the percentage of visible light reflected.
• Ultra Violet Rejected - is the amount of Ultra Violet rays rejected by the film.
• Shading Coefficient - is the ratio of solar energy entering through a window, compared to that which enters through a window of clear 3mm double strength sheet glass. Solar energy which enters includes that which is transmitted directly through the window and that portion of the energy absorbed into the window which is transferred into the interior.
• U Value - the measurement used in determining the ability of different structural components (such as windows) to conduct heat. The "U" value of a window is measured by the number of watts that will pass through each square metre of area per degree of Celsius (W / m2 / oC) from one side of the window to the other. "U" values will tell you how well your windows will hold in heated or cooled air. The lower the number the better.
• Glare Reduction - Ratio of the difference in visible transmission of the glass before and after installing the film. It is expressed as a percentage and is determined by the respective visible transmission values of the glass with and without the film.
• Solar energy Reflected - Ratio of the difference in solar energy entering the interior through glass and film to total energy impinging on the window.
• Solar Energy Absorbed - Ratio of solar energy absorbed by the window and converted to heat in the window to total solar energy impinging on the window. Typically expressed as a percentage.
• Estimated Fade Reduction - There are many factors which affect fading and this is the reason it is estimated as a figure which is based upon the Total energy rejection of a film and also the Glare reduction of a film. It should be noted that this estimation in no way constitutes a guarantee against fading.
• W.E.R.S. - Window Energy Rating Scheme, the only independent system that rates the energy performance of windows and window film in Australia, supported by the Australian Government.