Which characteristic distinguishes float glass?

Float glass is distinguished primarily by its smooth and even surface. The manufacturing process of float glass involves floating molten glass over molten tin, which helps achieve this uniformity. This results in a flat, high-quality product that is free of distortions and bubbles. Because of its clarity and finish, float glass is commonly used in windows, doors, and other applications where a flawless surface is essential.

The other characteristics listed do not accurately describe float glass. While curvature can be a feature of some types of glass, it is not characteristic of float glass, which is typically flat. Additionally, while some types of glass are used for mirrors, float glass itself is not specifically designed for this purpose unless it undergoes further processing, such as silvering. Lastly, float glass is not usually made from recycled materials; although recycled glass can be used in some manufacturing processes, high-quality float glass is typically produced from raw materials to ensure the desired properties are maintained.