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The acid resistance of E glass was studied by treating the material in HC1. During the acid treatment, nonsiliceous ions were leached out from the glass structure, due to ion exchange. The parameters which govern the removal are the concentration of the acid, time of contact, and acid temperature. At lower acid concentrations (<2 N ), calcium oxide and aluminum oxide could not be removed completely. By increasing the concentration of the acid to 4 N , most of the nonsiliceous ions were leached out. The number of ions removed increases with the increase in treatment time and temperature. When the glass was treated with 4 N HCI for a long time, there was a fluctuation in the total number of ions removed. The teachability of E glass is explained using the Muggins formula and the R 2 O/SiO 2 ratio.
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Ramachandran et al. (1980) studied this question.
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