Flat Glass: Types, Properties, and Performance Advantages
Flat glass is the general term for glass produced in a continuous, flat sheet, which is then processed for a vast range of architectural, automotive, and specialty applications. The dominant industrial manufacturing process is the float glass method, invented by Sir Alastair Pilkington, where molten glass is floated on a bath of molten tin. This creates a perfectly flat, parallel surface with uniform thickness as it cools and solidifies. The glass is then annealed in a lehr (a temperature-controlled oven) to relieve internal stresses. The resulting "float glass" is the primary raw material for nearly all subsequent flat glass products. Its properties—transparency, hardness, chemical inertness, and formability—make it a fundamental building material.