What is the strongest type of glass?

The 'strongest' type of glass depends on how you define strength—whether it's resistance to breaking, resistance to scratching, or the ability to stay intact after an impact. In the world of security, glass-clad polycarbonate (GCP) is often considered the strongest in terms of impact and ballistic resistance. It combines the hardness and clarity of glass with the incredible toughness and flexibility of polycarbonate. For architectural use where weight and thickness are less of a concern, multi-layered laminated glass is exceptionally strong and can be engineered to be bullet-resistant, blast-resistant, and hurricane-rated. Another contender for 'strongest' is chemically strengthened glass, like Gorilla Glass used in smartphones, which is extremely resistant to scratches and minor impacts but not meant for heavy structural use. If you are looking for the strongest glass for building security, a product like Riot Glass or a high-level UL-rated ballistic glass would be the top choice. These materials are designed to withstand sustained attacks that would destroy any other type of glazing. Ultimately, the strongest glass is the one that is specifically engineered for the specific threat it is meant to face.