What is the difference between the Solar Coefficient and the Solar Heat Gain Coefficient (SHGC)?
These two units of measure describe the amount of energy passing through glass and are linked mathematically. The Solar Coefficient (SC) is the ratio of solar energy with respect to clear glass 1 / 8 '' inch thick (which has a factor of 1.0). The Solar Heat Gain Coefficient (SHGC) has a lower value for the same product. For a window 1 / 8 '' inch thick, the Solar Heat Gain Coefficient is equal to 86% of the Solar Coefficient. In both cases, a lower figure indicates a lower solar gain.

Do all Low-E glasses look the same?
No. Both the thickness of the different Low-E coatings and the manufacturing process have an influence on the colour of the finished product.

Does Low-E glass work only in northern climates?
No. Glasses with Low-E coating can work in all types of climates.

Low-E coatings can reduce the loss of heat inside a house, therefore reducing heating costs.

Low-E coatings also reduce solar gain, thus contributing to a reduction in air-conditioning costs.

Do Low-E coatings work the same at night or when the sun isn’t shining?
Low-E coatings work 24 hours a day. In winter they reflect the radiant part of the interior heat (long waves of infrared radiation). Low-E coatings do not make a distinction between heat produced by solar energy and heat produced by the heating system, for these two types of heat are absorbed by materials and radiated again in the form of long wave radiation.

What is the difference between long wave infrared waves and shortwave infrared waves?
Shortwave infrared waves come directly from the sun but are not felt as heat. These waves convert to heat when they reach a certain mass.

Long wave radiant waves are emitted by any mass that has absorbed heat.
 
How do Low-E glass coatings reflect heat?
Heat is transmitted in three ways: conduction, convection and radiation. SOLARBAN glass coatings directly control the radiation portion of the heat transfer. The coating is composed of an extremely fine metal layer that reflects radiant heat, a bit like a mirror reflecting light.   

What is the potential reduction in ultraviolet (UV) energy transmission with PPG glass?
The reduction in UV ray transmission depends on the Low-E coating used and how the sealed unit is constructed (thickness of the glass, type of glass, etc.). Contact us for more detailed information.

Can PPG Low-E glass affect my plants?
Low-E glass is constructed in such a way as to filter a range of invisible rays while affecting as little as possible visible light and the portion of invisible light used by plants. In general, most plants that grow behind clear glass can also grow behind SOLARBAN60 coated glass.

Is there a difference in appearance between a window with a Low-E window pane and a window with clear glass?
There is a slight difference in appearance, but it is very difficult to see. If you put Low-E coated glass beside clear glass, you might notice a slight difference. Nevertheless, if you furnish a whole building with Low-E glass, it is unlikely that people would notice any difference between it and a building using clear glass..

Am I going to notice a difference in light quality between my clear windows and my new Low-E windows?
You are going to notice a reduction of light intensity compared to your former windows. However, what most people notice is the increase in comfort. An insulated window pane composed of Solarban® 60 transmits approximately 13% less visible light than the same clear window pane and 48% less solar energy.

What is ultraviolet light (UV)?
Solar energy consists of ultraviolet, visible and infrared. UV light is short wave energy consisting of a wave length between 290 and 380 nanometers. It is invisible and accounts for approximately 2% of the solar energy that reaches the earth. One-inch thick insulated glass furnished with Solarban® 60 allows approximately 14% of the UV rays that reach the earth to pass through insulated glass.

Do Venetian blinds, curtains, trees and shrubs affect the performance of my windows?
Yes and no. These can restrict the amount of heat and light entering room through the windows, but they don’t change the functional characteristics of Low-E glass.

Can tinted glass be used in combination with Low-E glass?
Yes, it is possible. The sealed unit can be made up of a tinted glass as long as Low-E glass is the interior glass. However, as mentioned in the section listing the types of glass, all windows should have glass that is the same thickness. 

Is it more difficult to clean windows that use Low-E glass?
No. If your windows use PPG Low-E glass, the coating is on the inside surface of the sealed unit. The exposed surfaces are of regular uncoated glass that can be cleaned like ordinary glass.

How does argon work?
Sealed units can be filled with air or other gases between the panes. Argon resists heat transfer conduction better than air. In addition, since it is heavier, it is subject to fewer displacements than air (convection). Therefore, an insulated pane containing argon allows for less heat transfer than the same insulated pane containing air.

Is argon dangerous?
Argon is an inert gas that consists of almost 1% of the air we breathe in every day and is not harmful. If the window glass breaks, there is no health risk.



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