EN 1209:2003
(Main)Chemicals used for treatment of water intended for human consumption - Sodium silicate
Chemicals used for treatment of water intended for human consumption - Sodium silicate
This European Standard is applicable to sodium silicate used for treatment of water intended for human consumption. It describes the characteristics and specifies the requirements and the corresponding test methods for sodium silicate. It gives information on its use in water treatment.
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Natriumsilikat
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Silicate de sodium
Kemikalije za pripravo pitne vode - Natrijev silikat
General Information
- Status
- Published
- Publication Date
- 16-Dec-2003
- Technical Committee
- CEN/TC 164 - Water supply
- Drafting Committee
- CEN/TC 164 - Water supply
- Current Stage
- 9060 - Closure of 2 Year Review Enquiry - Review Enquiry
- Start Date
- 02-Dec-2024
- Completion Date
- 02-Dec-2024
Relations
- Effective Date
- 22-Dec-2008
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
Overview
EN 1209:2003 (CEN) specifies requirements and test methods for sodium silicate when used for the treatment of water intended for human consumption. The standard covers identification, commercial forms (liquid, powder/granules), physical and chemical properties, purity criteria, sampling and analysis, and provisions for labelling, transport and storage. It is intended to help suppliers, laboratories and water utilities ensure sodium silicate is suitable and safe for potable water treatment.
Key topics and technical requirements
Identification and composition
- Chemical formula: Na2O · n SiO2 with n between 1.5 and 4.0.
- Typical active silica content ranges (note): about 20 % to 65 % (m/m); Na2O about 5 % to 30 % (m/m).
- Commercial forms: clear to slightly opalescent liquids or white powders/granules.
Physical properties
- Liquid densities at 20 °C typically 1.2–1.7 g/mL depending on ratio and concentration.
- Viscosity and solubility vary by grade; solutions are miscible with water.
Purity criteria and impurity limits (expressed per kg of SiO2)
- Sulfate (SO4²⁻) ≤ 750 mg/kg
- Iron (Fe) ≤ 300 mg/kg
- Fluoride (F⁻) ≤ 150 mg/kg
- Antimony (Sb) ≤ 33 mg/kg (revised from previous edition)
- Arsenic (As) ≤ 9 mg/kg
- Cadmium (Cd) ≤ 15 mg/kg
- Chromium (Cr) ≤ 9 mg/kg
- Cyanide (CN⁻) ≤ 15 mg/kg
- Lead (Pb) ≤ 30 mg/kg
- Mercury (Hg) ≤ 3 mg/kg
- Nickel (Ni) ≤ 9 mg/kg
- Selenium (Se) ≤ 60 mg/kg
Analytical and sampling methods
- Silica content, alkalinity and SiO2:Na2O ratio referenced to ISO 1690, ISO 1692 and ISO 1689.
- Elemental analyses referenced to EN / ISO methods (e.g., EN ISO 11885 for multi-element ICP-OES) and other listed normative references.
- Sampling rules reference ISO 3165, ISO 6206 and ISO 8213.
Labelling, transport and storage
- Requirements for means of delivery, EU safety labelling, transport regulations, marking and storage practices are specified to support safe handling.
Note: Conformity with EN 1209:2003 does not automatically grant regulatory approval for use in all EU/EFTA member states; national regulations and approvals still apply.
Applications and typical users
- Water treatment chemicals for coagulation, pH control, corrosion control and scale inhibition in drinking water treatment.
- Primary users:
- Municipal and private water utilities
- Chemical manufacturers and suppliers of sodium silicate
- Accredited analytical laboratories
- Regulators and procurement teams specifying product acceptance criteria and safety data
Related standards (selected)
- ISO 1690 - Determination of silica content
- ISO 1692 - Determination of total alkalinity
- ISO 1689 - Calculation of SiO2/Na2O ratio
- EN ISO 11885 - Multi‑element determination (ICP)
- ISO 3165 / ISO 8206 / ISO 8213 - Sampling of chemical products
Keywords: EN 1209:2003, sodium silicate, water treatment chemicals, drinking water, SiO2:Na2O ratio, purity criteria, test methods, CEN standard, water utilities.
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Frequently Asked Questions
EN 1209:2003 is a standard published by the European Committee for Standardization (CEN). Its full title is "Chemicals used for treatment of water intended for human consumption - Sodium silicate". This standard covers: This European Standard is applicable to sodium silicate used for treatment of water intended for human consumption. It describes the characteristics and specifies the requirements and the corresponding test methods for sodium silicate. It gives information on its use in water treatment.
This European Standard is applicable to sodium silicate used for treatment of water intended for human consumption. It describes the characteristics and specifies the requirements and the corresponding test methods for sodium silicate. It gives information on its use in water treatment.
EN 1209:2003 is classified under the following ICS (International Classification for Standards) categories: 71.100.80 - Chemicals for purification of water. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 1209:2003 has the following relationships with other standards: It is inter standard links to EN 1209:1997, EN 13445-5:2002/A10:2008, EN ISO 3696:1995, EN ISO 12846:2012. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 1209:2003 is associated with the following European legislation: EU Directives/Regulations: 93/38/EEC; Standardization Mandates: M/BC/CEN/88/15. When a standard is cited in the Official Journal of the European Union, products manufactured in conformity with it benefit from a presumption of conformity with the essential requirements of the corresponding EU directive or regulation.
EN 1209:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kemikalije za pripravo pitne vode - Natrijev silikatProdukte zur Aufbereitung von Wasser für den menschlichen Gebrauch - NatriumsilikatProduits chimiques utilisés pour le traitement de l'eau destinée a la consommation humaine - Silicate de sodiumChemicals used for treatment of water intended for human consumption - Sodium silicate71.100.80Chemicals for purification of water13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 1209:2003SIST EN 1209:2004en01-maj-2004SIST EN 1209:2004SLOVENSKI
STANDARDSIST EN 1209:19991DGRPHãþD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1209December 2003ICS 71.100.80Supersedes EN 1209:1997English versionChemicals used for treatment of water intended for humanconsumption - Sodium silicateProduits chimiques utilisés pour le traitement de l'eaudestinée à la consommation humaine - Silicate de sodiumProdukte zur Aufbereitung von Wasser für denmenschlichen Gebrauch - NatriumsilikatThis European Standard was approved by CEN on 10 October 2003.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1209:2003 ESIST EN 1209:2004
General information on sodium silicate.21Annex B (normative)
General rules relating to safety.23Bibliography.24SIST EN 1209:2004
1)Chemical Abstracts Service Registry Number.2)European Inventory of Existing Commercial Chemical Substances.SIST EN 1209:2004
3)100 kPa = 1 bar.SIST EN 1209:2004
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