One Optical Number (Glass Technical Paper FB56-18) ✓ Most Recent

The glass industry has been challenged for many years with creating an optical measurement standard for glass products and windows. Measuring glass distortion, i.e., deviation from flatness, is not a new topic. However, with tighter energy efficiency demands, more variations in glass sizes, code changes and new glazing systems have resulted in more heat-treated glass, double (and even triple) insulating glass units, and multi-ply laminates in use than ever before. All of these products may increase the amount of distortion seen on buildings. Learn more about creating an optical standard and/or number for a glass product. This document was first published in 2018. See more