Definition:

Fabrication debris is, as the name implies, material that should not be present on glass before it enters or travels thru the tempering furnace. It is made up mostly of glass fines but can include other debris such as insulation particles that have not been properly washed off the glass or cleaned from the furnace rollers. This debris will fuse to the glass surface during the tempering process and create a defective surface that window cleaners and others can dislodge and move across the glass surface in the process of properly cleaning the window.