Abstract / scope
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.
ISO 1689:1976Published
Sodium and potassium silicates for industrial use — Calculation of the ratio : silicon dioxide/sodium oxide or silicon dioxide/potassium oxide
Silicates de sodium et de potassium à usage industriel — Calcul du rapport dioxyde de silicium/oxyde de sodium ou dioxyde de silicium/ oxyde de potassium