Single glass is extremely smooth, distortion-free glass used in many window applications. It also provides the material for many other forms of glass, including tinted glass (heat absorbing) and laminated glass.

Single glass is made by pouring the molten glass from a furnace into a chamber that contains a bed of molten tin. The process is sometimes call the Pilkington Process. The atmosphere inside the chamber is carefully controlled. The glass floats on the tin and forms itself in the shape of the container. It spreads 90 to 140 inches wide at a thickness determined at the time of manufacture.

The upper surface of the glass is called the air side or score side. It is polished with fire. The lower surface is called the tin side. It is not fire-polished. From the chamber, the glass enters an oven, called a lehr. There it is slowly cooled at a specific rate. This process, called annealing, relieves the glass of internal stresses. The rate of cooling is crucial to the success of the final product. The glass emerges from the lehr at room temperature as a continuous ribbon. It is flat, fire-finished on the top, and has smooth, parallel surfaces. Automatic cutters trim the edges and cut the glass to length.

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