Glass+notes



Gla ss was first used in Roman imperial times. It was used specially in windows in very small pieces, it did'n have much transparency. This led to the invention of stained-glass Windows in the 12th Century. It was not until 17th Century that large sheets became practicable. And was in the 19th Century that began the mechanization of glass The main properties of glass are: - Solid and hard material - Disordered and amorphous structure (not elastic) - Fragile and easily breakable into sharp pieces - Transparent to visible light - Inert and biologically inactive material. - Glass is 100% recyclable These properties can be modified and changed by adding other compounds or heat treatment. There are many tipes of glass, some of they are :

- Float glass - Body tinted glass -Reflective glass -Low-e glass -Mirror -Insulating glass -Photovoltaic glass -Liquid cristal glazing -Tempered glass -Laminated glass -Anti reflecting glass Glass is a material very useful in architecture, it has many adventages like visual contact with the outside, allows the passage of the light , it can be mold and its 100% reciclable. Some of the disadvantages of glass are that its very expensive, does not protect from the outside temperature and it's very fragile.