ISO 1687:1976 Sodium and potassium silicates for industrial use; Determination of density at 20 degrees C of products in solution; Method using density hydrometer and method using pyknometer
ISO 1690:1976 Sodium and potassium silicates for industrial use; Determination of silica content; Gravimetric method by insolubilization
ISO 1692:1976 Sodium and potassium silicates for industrial use; Determination of total alkalinity; Titrimetric method
ISO 3200:1975 Sodium and potassium silicates for industrial use; Determination of sulphates content; Barium sulphate gravimetric method