FESTI Exam 4 Practice Test 2026 – Complete Prep Guide

Laminated safety glass is used because it has a plastic interlayer between glass sheets that holds shards together if the glass breaks. That interlayer, often made of PVB, keeps the windshield from shattering into dangerous pieces and maintains a barrier for the occupants, even after impact. This is why windshields are laminated—safety and visibility are preserved when the glass is hit.

Tempered glass, while very strong and designed to crumble into small, blunt pieces, does not stay in one piece after breaking, so it’s typically used for side and rear windows where continuous integrity isn’t as critical. Annealed glass is ordinary glass that can break into sharp shards, presenting a higher injury risk. Colored glass doesn’t provide this shard-holding property and isn’t chosen for safety-critical automotive glazing.