Cardinal Glass


                                                          About Cardinal Class

On this page you can learn all about one of the special types of glass we use in our impact windows and doors for installation in Fort Myers, Naples, Bonita Springs, Marco Island, Sanibel Island, Cape Coral, LeHigh Acres and all other nearby locations. For even more detailed information and other types of glass used click on the link below and you will be re-directed to the Official Cardinal Glass website

You can also click on the link below to view several interesting videos about the Cardinal Glass products that we can provide with your new windows. 

Information about Cardinal Neat Glass

Through the Cardinal Glass Company, we can provide Neat® Glass combined with Low E that will reduce or possibly eliminate window cleaning on the outside of your windows. The organic matter will break down when water and sunlight mix to help it loosen and fall off when it rains. This glass cannot only be installed on the first floor where window washing is easy, but it can also be installed on upper floors to eliminate the need for cleaning. Neat® Glass also provides the opportunity to install single hung windows on upper floors rather than the more expensive tilt in double hung windows that require more maintenance and have more moving parts.  

Information about Low E Glass

Have you seen a new home lately? Well, we mean, have you looked at the windows from the outside at a distance? Did they appear coated or colored like some new office building? If so, there probably was Low-E glass in the windows. Low-E glass is one of the technological marvels of today's residential construction. Who would have thought 25 years ago that glass could be coated with an ultra-thin layer of metal? Who would have guessed that this metal coating would allow you to see through the glass and provide actual insulating value? Not us, that's for sure!

The E is for Emissivity

Our Webster's Seventh New Collegiate Dictionary defines emissivity as "the relative power of a surface to emit heat by radiation." Emit means to "throw or give off." Okay, so Low-E glass obviously is a special glass that has a low rate of emission. In other words, if there is a heat source inside your house (or outside!), the glass bounces the heat from that object back away from the glass.

So, in the winter months, if you have Low-E glass in your home, much of the warmth (heat) given off by the furnace and all the objects which the furnace has heated, is bounced back into the room.In the summer the same thing happens but in reverse. The sun heats things up (the air, sidewalks, driveways, etc) outside of your house. 

This heat radiates from those objects and tries to get into your house. Of course, it tries to take the path of least resistance, that being the glass. With Low-E glass much of this heat bounces off the glass and stays outside..

The Two Types of Low E
There are two types of Low-E glass: hard coat and soft coat. As you might imagine, they have different properties. In fact, they actually look different.

Hard coat Low-E glass is manufactured by pouring a thin layer of molten tin onto a sheet of glass while the glass is still slightly molten. The tin actually becomes "welded" to the glass. This process makes it difficult or "hard" to scratch or remove the tin. Often this glass has a bluish tint to it.

Soft coat Low E glass on the other hand involves the application of silver, zinc or tin to glass in a vacuum (Custom Windows Low E 366 glass uses silver oxide installed on a $60 million equipment line.) The glass enters a vacuum chamber filled with an inert gas which is electrically charged. The electricity combined with the vacuum allows molecules of metal to sputter onto the glass. 
he coating is fairly delicate or "soft."

Furthermore, if silver is used, this coating can oxidize if exposed to normal air. For this reason, soft coat Low-E glass must be used in an insulated glass assembly. Sealing the soft coating in between two pieces of glass protects the soft coating from outside air and sources of abrasion. Also, the space between the two pieces of glass is often filled with argon gas, as is the case with Custom Windows products. The argon gas inhibits oxidation of the metallic coating. It also acts as an additional insulator.

The two types of Low-E glass have different performance characteristics. The soft coat process has the ability to reflect more heat back to the source. It typically has a higher R value. R values are a measure of resistance to heat loss. The higher the R value of a material, the better its insulating qualities. Look at the table below for a comparison of R values and the different types of glass.                 

Types of Glass and Their R Values

Soft Coat Low-E insulated glass with argon

4.35 (The Custom Windows Design)

Soft Coat Low-E insulated Glass


Hard Coat Low-E insulated glass with argon


Hard Coat Low-E insulated glass


Clear Insulated Glass 7/8 inch overall thickness


Single Pane regular glass


Impact-Ready, Inc. installs the top choice on the above table which provides our customers with the highest possible R value.


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