“Strongest” really depends on what you mean by strength. Resistance to breaking, resistance to scratching, and staying intact after impact aren’t the same thing. In the security world, glass-clad polycarbonate (GCP) usually gets the nod for impact and ballistic resistance. It combines the clarity and hardness of glass with the toughness and flexibility of polycarbonate.
For architectural applications where weight isn’t as much of a constraint, multi-layered laminated glass is exceptionally strong and can be engineered for bullet resistance, blast resistance, or hurricane ratings, sometimes all three. Then there’s chemically strengthened glass, like Gorilla Glass in smartphones, which resists scratches and minor impacts extremely well but was never meant for structural use.
If building security is the goal, something like Riot Glass or a high-level UL-rated ballistic glass is going to be your top pick. Those materials are built to withstand sustained attacks that would take out any other glazing. At the end of the day, the strongest glass is really just the one engineered for the specific threat it’s up against.
