DS/ISO 720:2020

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


Status:
Current
Type:
Standard
Language:
English
Subject:
Price from:
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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.

Number of pages: 16

Published: 2020-09-17

Date of approval: 2020-09-15

International relationships : ISO 720:2020 IDT

ICS: 81.040.01 - Glass in general

Item number: M337604


Committees

Committee

  • ISO/TC 76
  • ISO/TC 76/WG 2

Danish committee

DS/S-093