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ISO 720:2020

Glass — Hydrolytic resistance of glass grains at 121 °C — Method of test and classification

Sep 11, 2020

General information

90.20     Jul 15, 2025

ISO

ISO/TC 76

International Standard

81.040.01  

English   French  

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Scope

This document specifies
a) a method for determining the hydrolytic resistance of glass grains at 121 °C. The resistance is measured and expressed by the volume of acid required for titration of the alkali extracted from the unit mass of glass, and can also be expressed by the amount of sodium oxide equivalent to this volume of acid, and
b) a classification of glass according to the hydrolytic resistance determined by the method of this document.
This document is intended for use on the more resistant types of glass, e.g. borosilicate glass.
NOTE 1 For the less resistant glasses, e.g. soda-lime, the method specified in ISO 719 is more suited.
NOTE 2 It is emphasized that there is no exact correlation between the classification laid down in this document and that laid down in ISO 719, and it is, therefore, essential to identify which classification is being used.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 720:1985

NOW

PUBLISHED
ISO 720:2020
90.20 Standard under periodical review
Jul 15, 2025

National adoptions

SRPS ISO 720:2022  
ISS

Glass — Hydrolytic resistance of glass grains at 121 °C — Method of test and classification

90.20   Standard under periodical review

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