Around the mid-1920s, Henry Ford was slightly injured by a windshield fragment, which prompted Ford to invent laminated safety glass. Benefiting from the gradual expansion of the plastics industry, Ford suddenly had the idea of putting two pieces of glass together, separated by a layer of PVC plastic to make a sandwich. This technology is still being used. The idea is perfect for windshields because the plastic sandwich prevents the glass from falling like a shower on the person in the car after breaking. Another benefit is that the plastic makes the windshield energy-absorbing and shock-absorbing, which helps protect passengers in the event of an accident. JokerJun: Tempered glass is another kind of safety glass, which is widely used in the side windows and rear windows of modern automobiles. Compared with laminated glass, tempered glass increases its strength through heat and pressure. When it is broken, it shatters into small, sleek particles like bread crumbs, which reduces the possibility of glass fragments hurting people. Unfortunately, tempered glass is not suitable for repair and restoration, so it is suitable for completely damaged side and rear window glass.