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Objects

Borosilicate glass

Composition: silica (80%), boron oxide (13%), soda (4%), alumina (3%).

N° inventaire: TR 997.9.4. Categories: , Tag:

• Date: 1915-1997

• Brand: Pyrex

• Manufacturing technique:

• Dimensions: H : 14 ; Ø : 8,2

• Collection: Coll. Ecomusée de l’Avesnois

• Credit: © Lucie Nicolas / Ecomusée de l’Avesnois

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Formers, fluxes, stabilizers and refining agents are the basic ingredients of glass. Depending on the ratio of each of these ingredients, and their nature, the resulting glass will be described in terms of its thermal, chemical or mechanical resistance, or its transparency. Each use has its own recipe. Each use has its own recipe. Borosilicate glass, commonly known by the brand name Pyrex, is 80% silica and very resistant to thermal shocks. It is used for laboratory equipment and thermal insulation. High silica glass is 96% silica and particularly suitable for telescope mirrors because of its great optical transparency. Soda lime glass contains more stabilizer which makes it resistant to solvents, such as water and acids. It is used to make bottles and flasks, and works of art. Crystal glass is used to make fine glassware and contains at least 24% lead oxide, hence its other name ‘lead glass’.