Page "Glass" Paragraph 23

After melting, homogenization and refining ( removal of bubbles ), the glass is formed.

Flat glass for windows and similar applications is formed by the float glass process, developed between 1953 and 1957 by Sir Alastair Pilkington and Kenneth Bickerstaff of the UK's Pilkington Brothers, who created a continuous ribbon of glass using a molten tin bath on which the molten glass flows unhindered under the influence of gravity.

The top surface of the glass is subjected to nitrogen under pressure to obtain a polished finish.