Chemical Durability
Class of Resistance to Water Effects (ISO 719) HGB 1
Class of Resistance to Acid Effects (ISO 1776 a DIN 12116) Class S1
Class of Resistance to Various Kinds of Hydroxides (ISO 695) Class A2
SIMAX® borosilicate glass 3.3 is highly resistant to water effects, neutral and acid solutions, heavy acids and their mixtures, to chlorine, bromine, iodine and organic compounds. Even longterm effects at temperatures above 100ºC, SIMAX® borosilicate glass 3.3 outperforms most metals and other permeable materials.
Due to water and acid effects SIMAX® glass releases only trace amounts of primarily monovalent ions. A very thin, permeable siliceous gel layer forms on the surface of the glass which creates a barrier to further attack. The exceptions to SIMAX® glass chemical durability are the following chemicals to be avoided: hydrogen fluoride (any concentration), hot concentrated phosphoric acid and alkaline solutions. Alkaline solutions attack glass slowly at room temperatures but rate of attack increases with concentration and temperature.
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