This article will help with glass type identification for Andersen® windows and patio doors and provides examples of glass code images.
To determine the type of glass in an Andersen® window or patio door, first locate the Andersen® glass logo.
Locate Andersen® Glass Logo
The Andersen® glass logo is etched into the glass surface and is usually found in the bottom corner. To make the glass etching easier to read, try using the following helpful hints:
A magnifying glass.
Take a digital picture and enlarge the image.
A flashlight to illuminate the characters.
A plain, dark piece of paper behind the etching to help block out glare.
Identify Glass Type
Around the Andersen® glass logo, will be a series of letters and numbers. Here you will find the glass type. The exact notation will vary based on the glass type selected. Notations may include (and are not limited to): HP Low-E, High-Performance (HP), HP Sun, HP Smart Sun, Dual-Pane Clear, etc. The Andersen® glass logo will not always identify which specialty glass is in the window or patio door. In the case of tinted or patterned glass, the specialty glass type will not be marked.
Additional logo examples can be seen in Glass Types 
.
Glass Code
Tempering Code
Depending on the window or patio door type, the unit may have a tempering code etched into the glass surface. The tempering code does not identify the glass type. Please locate the Andersen® glass logo to determine the glass type.
Tempered Glass Code
FX-Number
From 2002 to the Present we have etched the glass used on Flexiframe®, Arch & Springline™ units. The Andersen® glass logo example above the FX-Number is 1234x56. Monolithic Impact Resistant Glass does not have an FX-Number etched on the glass.
For units prior to 2002, the FX-Number may be written under the sill stop or on the glass label, see Identify Your Andersen® Window or Patio Door Using a Product ID Label for more information.
Contact Andersen® Windows and Doors if you are unsure about the glass type, or where to find the Andersen® glass logo, identify any of the glass types listed above.
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