ISO 720:1985 Preview
Glass -- Hydrolytic resistance of glass grains at 121 degrees C -- Method of test and classification
This standard was last reviewed and confirmed* in 2013.
*Therefore this version remains current
The principle, reagents, apparatus and the procedure are specified. The resistance is expressed by the volume of acid required for titration of the alkali extracted from the unit mass of glass. The permissible range of the values obtained and the limit values in the hydrolytic resistance grain test are listed.