1689 NTERNATIONAL STANDARD TSO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOIHA OPIAHM3ALM HO CTAHIAPTM3ALIWM.ORGANISATION INTERNATIONALE DE NORMALISATION Sodium and potassium silicates for industrial use - SiO2 SiO2 Calculation of the ratio Naz0 K20 Si2 SiO2 Silicates de sodium et de potassium a usage industriel - Calcul du rapport Na20 K20 First edition -- 1976-02-01 FEB 9 - 1976 ANsr Internct Doc Sect UDC 661.83.65 : 543 Ref. No. 1SO 1689-1976 (E) Descriptors : sodium silicates, potassium silicates, chemical anatysis, determination of content, ratios, silicon dioxide, sodium oxide, potassium oxide Price based'on 2pages Copyright international Organization for Standardization e from IHS Notfor Resale FOREWORD Iso (the International Organization for Standardization) is a worldwide federation of national standards institutes. (IsO Member Bodies). The work of developing International Standards is carried out through ISO Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental and non-governmental, in liaison with IsO, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the ISO Council. Prior to 1972, the results of the work of the Technical Committees were published as Iso Recommendations; these documents are now in the process of being transformed into International Standards. As part of this process, Technicai Committee ISO/TC 47 has reviewed ISO Recommendation R 1689 and found it technically suitable for transformation. International Standard IsO 1689 therefore replaces ISo Recommendation R 1689-1970 to which it is technically identical. IO Recommendation R 1689 was approved by the Member Bodies of the following countries : Australia India Romania Iran South Africa, Rep. of Austria Belgium Israel Spain Brazil Italy Switzerland Czechoslovakia Japan Thailand Egypt, Arab Rep. of Netherlands Turkey New Zealand U.S.S.R. France Germany Peru Yugoslavia Greece Poland Portugal Hungary Body of the following country expressed disapproval of the The Member Recommendation on technical grounds : United Kingdom The Member Body of the following country disapproved the transformation of ISO/R 1689 into an International Standard : United Kingdom @ Internationat Organisation for Standardization, 1976 . e from IHS Not for Resale INTERNATIONAL STANDARD ISO 1689-1976 (E) Sodium and potassium silicates for industrial use -- SiO2 SiO2 Calculation of the ratio K20 Na20 1 SCOPE AND FIELD OF APPLICATION 4 POTASSIUM SILICATES This International Standard specifies the formula for the a = total alkalinity, expressed in K20, % (m/m) (see SiO2 SiO2 ISO 1692) for sodium silicates b = silica (SiO2), % (m/m) (see IS0 1690) and potassium silicates for industrial use, respectively. In this ratio, only the Na20 or the K20 combined in the c = potassium carbonate (K2CO3), % (m/m) (see ISO 1691) form of silicates is considered. d= K20 combined in the carbonate form, % (m/m) 94,2 2 REFERENCES = 0,682 c 138,2 Is0 1690, Sodium and potassium silicates for industrial use -- Determination of silica content -- Gravimetric method e =- K20 combined in the silicate form, % (m/m) = a -- d by insolubilization. =a-0,682 c Iso 1691, Sodium and potassium silicates for industrial SiO2 b b use - Determination of carbonate content - Gas-volumetric f ratio by mass- method. K20 a- 0,682 c e iso 1692, Sodium and potassium silicates for industrial SiO2 Determination of total alkalinity - Titrimetric use f × 1,568 g = molar ratio method. K20 3 SODIUM SILICATES a = total alkalinity, expressed in Na2O, % (m/m) (see 1SO 1692) b = silica (SiO2), % (m/m) (see IS0 1690) 5 TEST REPORT c = sodium carbonate (Na2CO3), % (m/m) (see ISO 1691) The test report shall include the following particulars