This International Standard specifies a gas-volumetric method for the determination of the carbonates content, expressed, respectively, as sodium carbonate or potassium carbonate, of sodium and potassium silicates for industrial use. Three cases, defined by a preliminary test, are envisaged : 1.1 Sodium or potassium silicates containing neither sulphides nor chlorates. 1.2 Sodium or potassium silicates containing sulphides. 1.3 Sodium or potassium silicates containing chlorates.
GSO ISO 1691:2016 history
2016GSO ISO 1691:2016 Sodium and potassium silicates for industrial use -- Determination of carbonates content -- Gas-volumetric method