The touchfoil™ operates through any non-metallic or non-conductive glass. This type of glass uses a metal in the manufacturing process so the touchfoil™ will not work through this glass. Other metal tints also stop the touchfoil™ from working.
For safety reasons visualplanet recommend toughened and/or laminated glass. Ask for any safety marks that are a legal requirement to be placed at the very edge of the glass.