ISO 719:1985 Preview
Glass -- Hydrolytic resistance of glass grains at 98 degrees C -- Method of test and classification
This standard was last reviewed and confirmed* in 2011.
*Therefore this version remains current
The principle, reagents, apparatus and 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. For five classes of grain the limit values in the test are listed.