5. Physicochemical and functional properties of glass
5.1 Chemical resistance
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Inalterability and inertia of glass
Glass is generally regarded as the chemical benchmark for the foodstuffs it may contain. Even if very slight surface migrations may occur on contact with an aqueous solution, they are non-toxic, which qualifies glass as an inert material.
Consequently, this material is indisputably safe in the pH range from 3 to 7. Tests carried out in contact with various foodstuffs show extremely low migrations, often below the detection thresholds of standardized analysis methods.
The same cannot be said for the storage of basic products or certain chemicals, such as hydrofluoric acid. But that's not food.
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Physicochemical and functional properties of glass
Chips detection in glass containers
Bibliography
Books and magazines
Regulations
Regulation (EC) no. 1935/2004 of October 27, 2004, materials and articles brought or intended to be brought into contact with foodstuffs.
Standards and norms
- Machines et installations pour la production, le façonnage et la transformation de verre creux - NF EN 13042 -
- Management de l'hygiène dans la fabrication des emballages destinés aux denrées alimentaires - NF EN 15593 -
- Récipients en verre, fabrication et vocabulaire - ISO 7348 - 1992
- Récipients en verre, résistance à la pression interne - ISO 7458 - 2004
- Récipients en verre. Résistance...
Directories
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Food packaging glass manufacturing
• Verre on Line, the French glass portal http://www.verreonline.fr
• Glass Industries Federation http://www.fedeverre.fr
• French Federation of Glass Professionals...
Statistical and economic data
History of hollow glass
There are many different types of natural glass:
space: the result of meteorites, and among these tektites is the glass known as libyque;
atmospheric: the result of lightning action: fulgurites ;
animal: skeleton of certain sponges ;
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