This standard was last reviewed and confirmed in 2018. Therefore this version remains current.
The document specifies the formula for the calculation. In this ratio, only sodium oxide and potassium oxide combined in the form of silicates is considered. Replaces ISO Recommendation R 1689-1970.
Status: PublishedPublication date: 1976-02
Edition: 1Number of pages: 2
Technical Committee: ISO/TC 47 Chemistry
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