a much more thorough version of this test is outlined in various international and domestic testing standards for glass containers, all with comparable methodologies. these tests evaluate the hydrolytic stability of the containers under more severe conditions, wherein containers, filled close to capacity with purified water, are covered and then heat-cycled in an autoclave at 121 °c for 1 hour. after cooling to room temperature, the water is titrated with acid to evaluate the ph of the water, and therefore the equivalent amount of alkali extracted during the heat cycle. the alkali content of the rinse water can also be evaluated more directly by chemical analysis of the rinse water, as outlined in more recent versions of the european pharmacopoeia. according to the pharmacopoeia standards, internally treated or dealkalized soda-lime glass containers are designated as "type ii" containers, thus setting them apart from their untreated counterparts due to their improved resistance to product interactions (as opposed to "type iii", which is standard, untreated soda-lime glass, or "type i", which is reserved for highly resistant borosilicate glass).