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Conturax (Borosilicate Glass 3.3) is highly resistant to water,
neutral and acid solutions, concentrated acids and acid mixtures,
and to chorine, bromine, iodine and organic substances. The chemical
resistance of this glass is superior to that of most metals and
other materials, even when exposed to long processing periods and
temperatures above 100 ēC.
A slight release of mainly monovalent ions takes place after exposure
of the glass to water or acids. A very thin layer of impervious
silica gel is subsequently formed on the surface of the glass, which
in turn slows clown further attack. Acid, hot phosphoric acid and
alkaline solutions attack the glass surface as a function of concentration
and temperature.
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