ISO 8424:2023
Raw optical glass — Resistance to attack by aqueous acidic solutions — Test method and classification
This document specifies two methods for testing the resistance of raw optical glasses to attack by aqueous acidic solutions and defines a classification of optical glasses according to the acid resistance determined by these methods.
The surface method tests the resistance of the polished plate-shaped optical glass to attack by aqueous acidic solutions at 25 °C for a specified time and indicates the class determined by this method as “SR-S”.
The powder method tests the resistance of crushed granular optical glass to attack by an acidic aqueous solution at above 98 °C for 1 h, and indicates the class determined by this method as “SR-P”.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle of measurement
4.1 Surface method
4.2 Powder method
4.3 Selection help for the methods
5 Reagents
6 Surface method
6.1 Apparatus
6.2 Preparation of the samples
6.2.1 General
6.2.2 Lapping
6.2.3 Polishing
6.2.4 Calculation of total surface area
6.2.5 Cleaning
6.3 Procedure
6.3.1 General
6.3.2 Testing unknown glasses
6.3.3 Testing known glasses
6.4 Expression of results
6.5 Classification and designation
7 Powder method
7.1 Apparatus
7.1.1 Sieve
7.1.2 Basket for corrosion test
7.1.3 Apparatus for corrosion test
7.1.4 Heating bath
7.2 Preparation of the specimen of the glass to be tested
7.3 Procedure
7.4 Classification and designation
8 Test report
Annex A (informative) Acid resistance correlation between class SR-S and class SR-P
Annex B (informative) Method for glass polishing and processing
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle of measurement
4.1 Surface method
4.2 Powder method
4.3 Selection help for the methods
5 Reagents
6 Surface method
6.1 Apparatus
6.2 Preparation of the samples
6.2.1 General
6.2.2 Lapping
6.2.3 Polishing
6.2.4 Calculation of total surface area
6.2.5 Cleaning
6.3 Procedure
6.3.1 General
6.3.2 Testing unknown glasses
6.3.3 Testing known glasses
6.4 Expression of results
6.5 Classification and designation
7 Powder method
7.1 Apparatus
7.1.1 Sieve
7.1.2 Basket for corrosion test
7.1.3 Apparatus for corrosion test
7.1.4 Heating bath
7.2 Preparation of the specimen of the glass to be tested
7.3 Procedure
7.4 Classification and designation
8 Test report
Annex A (informative) Acid resistance correlation between class SR-S and class SR-P
Annex B (informative) Method for glass polishing and processing
Bibliography