Investigation
Does stomach acid digest swallowed glass and make it safe to swallow?
A controlled materials study observed composition-dependent surface alteration of commercial glasses in acidic solution.
4% acetic acid, pH 2.4, 70°C, 1096 days; approximately 0.88 ± 0.05 μm sodium-depletion layer in the examined soda-lime glass, not a measured whole-shard gastric dissolution rate.