Safety and security glass Float glass is a so-called flat glass, which is produced in a float glass process. To do this, the molten glass is applied to a bath of liquid tin. Since the glass is lighter than tin, it floats on the surface and spreads out completely evenly. The result is glass with an immaculately smooth surface that is free of air pockets (such as bubbles or streaks). Because of these advantages, the float glass process has largely become established in the manufacture of flat glas