标准编号：ISO 720:2020
中文名称：玻璃 121℃下玻璃颗粒的耐水解性 试验和分类方法
英文名称：Glass — Hydrolytic resistance of glass grains at 121 °C — Method of test and classification
发布日期：2020-09
标准范围
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.
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