ISO 720:2020 玻璃 121℃下玻璃颗粒的耐水解性 试验和分类方法

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

本文件规定a） 一种在121°C下测定玻璃颗粒耐水解性的方法。该耐水性通过滴定从单位质量玻璃中提取的碱所需的酸的体积来测量和表示，也可以通过相当于该体积酸的氧化钠的量来表示，以及b） 根据本文件方法确定的耐水解性对玻璃进行分类。本文件适用于耐腐蚀性更强的玻璃，例如硼硅酸盐玻璃。注1:对于耐水性较差的玻璃，例如钠石灰，ISO 719中规定的方法更适合。注2:需要强调的是，本文件中规定的分类与ISO 719中规定的分类之间没有确切的相关性，因此，有必要确定使用的分类。

This document specifiesa) 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, andb) 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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