October 12, 2025
Float Glass: Primary Glass Manufactoring and Mechanical Properties
In this video Mauro Overend explains the well-known properties of glass and how they result from its manufacturing process. Glass is an optically transparent but brittle material, making it ideal for architecture yet prone to sudden breakage. The video focuses on the industrial float glass process, invented by Alastair Pilkington in the 1950s. This process involves melting raw materials like silica sand, soda, and lime at 1500°C. The molten glass is then floated on a bath of molten tin, where it cools and solidifies into a flat uniform sheet. This rapid, controlled cooling results in an "amorphous isotropic solid," which gives glass its transparency, perfect elasticity, and brittleness. The glass is then annealed (gradually cooled) to minimize internal stresses, making it possible to cut. The final product, known as annealed float glass, is the base material for most architectural applications. The video was produced by the Open GLASSroom project. Special thanks to Mauro Overend for contributing to the Open GLASSroom OER collection. The creation of these resources has been (partially) funded by the ERASMUS+ grant program of the European Union under grant no. 2022-1-DE01-KA220-HED-000089750. Neither the European Commission nor the project's national funding agency DAAD are responsible for the content or liable for any losses or damage resulting of the use of these resources.