Physicochemical and functional properties of glass
Glass packaging concerning food products

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.