Ballistic glass is a type of transparent material designed to resist penetration from bullets and other projectiles. It is commonly made from layers of glass and polycarbonate, which work together to absorb and disperse the energy of impacts. This makes it a popular choice for security applications, such as in banks, military vehicles, and high-security buildings. The thickness and composition of ballistic glass can vary depending on the level of protection required. It is tested according to specific standards, such as those set by the Underwriters Laboratories (UL) or the National Institute of Justice (NIJ), to ensure its effectiveness against different types of firearms.