EN 14664:2026
(Main)Chemicals used for treatment of water intended for human consumption - Iron (III) sulfate, solid
- Abstract
This document is applicable to iron (III) sulfate solid used for treatment of water intended for human consumption. It describes the characteristics of iron (III) sulfate solid and specifies the requirements and the corresponding analytical methods for iron (III) sulfate solid and gives information on its use in water treatment. It also specifies the rules relating to safe handling (normative Annex B) and describes the use of iron (III) sulfate solid (informative Annex A).
- Status
- Not Published
- Publication Date
- 15-Dec-2026
- Technical Committee
- CEN/TC 164 - Water supply
- Drafting Committee
- CEN/TC 164/WG 9 - Drinking water treatment
- Current Stage
- 5060 - Closure of Vote - Formal Approval
- Start Date
- 22-Oct-2026
- Due Date
- 20-Jan-2027
- Completion Date
- 22-Oct-2026
EN 14664:2026 is a CEN standard for iron (III) sulfate, solid used in treatment of water intended for human consumption. It specifies the product description, purity criteria, analytical methods, labelling, transport, storage, and safety guidance for suppliers and users. It is aimed at anyone selecting, supplying, testing, or handling this coagulant for drinking-water treatment.
What does EN 14664:2026 specify?
EN 14664:2026 applies to iron (III) sulfate, solid used for treatment of water intended for human consumption. It gives the product characteristics, the requirements and analytical methods for the product, and practical information on use in water treatment.
The document is organized into clauses on scope, normative references, terms and definitions, description, purity criteria, test methods, and labelling - transportation - storage. It also has two annexes that split the practical guidance into general use information and safety rules.
| Annex | What it covers |
|---|---|
| Annex A | General information on iron (III) sulfate, solid, including origin, quality of the commercial product, use, dosage, application, side effects, and removal of excess product |
| Annex B | Normative safety rules, including safe handling and use, first aid, spillage, and fire response |
What are the key requirements of EN 14664:2026?
EN 14664:2026 sets out how the product is identified, what purity it must meet, how it is tested, and how it is labelled and stored. In practice, this means suppliers need to control composition and impurities, and users need to check that the delivered product matches the intended grade and type.
Product description and identity
Clause 4 identifies the substance as iron (III) sulfate, solid, also called ferric sulfate, solid. It gives physical and chemical descriptors such as appearance, density, solubility, and the fact that the solid is slightly hygroscopic. For a buyer or lab, this helps confirm that the delivered material is the expected coagulant form and not a different iron salt or solution.
Purity and classification
Clause 5 sets minimum purity requirements and divides the product into grades and types. The grades control general product quality through limits for manganese, iron(II), and insoluble matter, while the types control trace metals such as arsenic, cadmium, chromium, mercury, nickel, lead, antimony, and selenium. This matters because the selected grade and type affect both treatment performance and the trace metal load added to the water.
Test methods
Clause 6 directs users to EN 17215 for sampling and for analytical methods. That means the standard does not create separate test methods here; it relies on the iron-based coagulants methods in EN 17215 for checking compliance.
Labelling, transport, storage, and handling
Clause 7 covers delivery forms, example safety labelling, transport status, marking, and storage. The product is delivered in suitable bags or lined bulk transport, marked with the product name, trade name, grade, type, net mass, supplier details, and a statement of conformity to EN 14664. It is not treated as a dangerous product for road, rail, sea, or air transport, but the standard still calls for safe storage and avoidance of contact with water because the solution is acidic.
Safety rules
Annex B gives the normative safety rules. It requires the supplier to provide current safety instructions and the user to read the safety data sheet, and it gives practical first-aid and spillage actions. For operating staff, this is the section to use for day-to-day handling and emergency response.
What terms does EN 14664:2026 define?
- Iron (III) sulfate, solid - the product covered by the standard, used as a treatment chemical for water intended for human consumption.
- Ferric sulfate, solid - the common synonym used for the same product.
- Grade - the quality category in Clause 5 that groups products by limits for manganese, iron(II), and insoluble matter.
- Type - the category in Clause 5 that groups products by trace metal limits.
- Fe(III) - ferric iron, the basis used for expressing the purity and impurity limits in the tables.
- CAS Registry Number - the chemical identifier used to reference the substance in registries and databases.
- EINECS reference - the European inventory reference used to identify the substance in chemical listings.
- eSDS - extended safety data sheet, the document that carries the product safety information for users.
Who uses EN 14664:2026?
EN 14664:2026 is used by water treatment operators, chemical manufacturers, distributors, laboratories, and procurement teams. It supports product selection, incoming inspection, analytical verification, marking, storage, and safety handling for iron (III) sulfate, solid in drinking-water treatment.
National authorities and regulators may also refer to it when checking product information, safety documentation, and the suitability of a treatment chemical for drinking-water applications.
What changed in EN 14664:2026 from the previous edition?
EN 14664:2026 supersedes EN 14664:2023. The European foreword states that the significant technical change is an update of the information related to limit values in Table 2 and Annex A.
Which standards are used with EN 14664:2026?
- EN 17215 - provides the sampling method and the analytical methods used in Clause 6 for iron-based coagulants.
What does the EN 14664:2026 document contain?
EN 14664:2026 contains the product identification data, including name, synonym, formula, registry numbers, commercial forms, and physical properties. It also contains purity tables for grades and types, with limit values for main quality indicators and trace metals.
The document includes the test approach by reference to EN 17215, plus packaging, labelling, transport, marking, and storage guidance. Annex A adds practical information on origin, manufacture, dosage, application, side effects, and how excess product is removed in the treatment process.
Annex B provides emergency and handling procedures, including first aid, spill cleanup, and fire information. Figures and tables are used for labelling examples and for the quality and trace metal limits that users need when checking compliance or selecting a product.
Relations
- Effective Date
- 11-Dec-2024
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Frequently Asked Questions
EN 14664:2026 is a draft published by the European Committee for Standardization (CEN). Its full title is "Chemicals used for treatment of water intended for human consumption - Iron (III) sulfate, solid". This standard covers: This document is applicable to iron (III) sulfate solid used for treatment of water intended for human consumption. It describes the characteristics of iron (III) sulfate solid and specifies the requirements and the corresponding analytical methods for iron (III) sulfate solid and gives information on its use in water treatment. It also specifies the rules relating to safe handling (normative Annex B) and describes the use of iron (III) sulfate solid (informative Annex A).
This document is applicable to iron (III) sulfate solid used for treatment of water intended for human consumption. It describes the characteristics of iron (III) sulfate solid and specifies the requirements and the corresponding analytical methods for iron (III) sulfate solid and gives information on its use in water treatment. It also specifies the rules relating to safe handling (normative Annex B) and describes the use of iron (III) sulfate solid (informative Annex A).
EN 14664:2026 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 14664:2026 has the following relationships with other standards: It is inter standard links to EN 14664:2023. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 14664:2026 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)
SLOVENSKI STANDARD
oSIST prEN 14664:2025
01-september-2025
Kemikalije, ki se uporabljajo za pripravo pitne vode - Železov (III) sulfat, v trdnem
stanju
Chemicals used for treatment of water intended for human consumption - Iron (III)
sulfate, solid
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Eisen(III)sulfat,
fest
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation
humaine - Sulfate de fer (III), solide
Ta slovenski standard je istoveten z: prEN 14664
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 Kemikalije za čiščenje vode Chemicals for purification of
water
oSIST prEN 14664:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN 14664:2025
oSIST prEN 14664:2025
DRAFT
EUROPEAN STANDARD
prEN 14664
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2025
ICS 71.100.80 Will supersede EN 14664:2023
English Version
Chemicals used for treatment of water intended for human
consumption - Iron (III) sulfate, solid
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Sulfate de fer menschlichen Gebrauch - Eisen(III)sulfat, fest
(III), solide
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 164.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14664:2025 E
worldwide for CEN national Members.
oSIST prEN 14664:2025
prEN 14664:2025 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Description . 6
4.1 Identification . 6
4.1.1 Chemical name . 6
4.1.2 Synonym or common names . 6
4.1.3 Relative molecular mass . 6
4.1.4 Empirical formula . 6
4.1.5 Chemical formula . 6
4.1.6 CAS Registry Number . 7
4.1.7 EINECS reference . 7
4.2 Commercial forms . 7
4.3 Physical properties . 7
4.3.1 Appearance . 7
4.3.2 Density . 7
4.3.3 Solubility (in water) . 7
4.3.4 Vapour pressure . 7
4.3.5 Boiling point at 100 kPa . 7
4.3.6 Melting point . 7
4.3.7 Specific heat . 7
4.3.8 Viscosity (dynamic) . 7
4.3.9 Critical temperature . 7
4.3.10 Critical pressure . 8
4.3.11 Physical hardness . 8
4.4 Chemical properties . 8
5 Purity criteria . 8
5.1 General . 8
5.2 Composition of commercial product . 8
5.3 The grade of the product . 8
5.4 The type of the product . 9
6 Test methods .10
6.1 Sampling .10
6.2 Analyses .10
7 Labelling - Transportation - Storage .10
7.1 Means of delivery .10
7.2 Risk and safety labelling according to the EU Directives .10
7.3 Transportation regulations and labelling .11
7.4 Marking .12
7.5 Storage .12
7.5.1 General .12
7.5.2 Long term stability .12
7.5.3 Storage incompatibilities .12
Annex A (informative) General information on iron (III) sulfate solid .13
oSIST prEN 14664:2025
prEN 14664:2025 (E)
A.1 Origin . 13
A.1.1 Raw materials . 13
A.1.2 Manufacturing process . 13
A.2 Quality of commercial product . 13
A.3 Use . 14
A.3.1 Function . 14
A.3.2 Form in which it is used . 14
A.3.3 Treatment dose . 15
A.3.4 Means of application. 15
A.3.5 Secondary effects . 15
A.3.6 Removal of excess product . 15
Annex B (normative) General rules relating to safety . 16
B.1 Rules for safe handling and use . 16
B.2 Emergency procedures . 16
B.2.1 First aid . 16
B.2.2 Spillage . 16
B.2.3 Fire . 16
Bibliography . 17
oSIST prEN 14664:2025
prEN 14664:2025 (E)
European foreword
This document (prEN 14664:2025) has been prepared by Technical Committee CEN/TC 164 “Water
supply”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 14664:2023.
prEN 14664:2025 includes the following significant technical changes with respect to EN 14664:2023:
— update of the information related to limit values in Table 2 and Annex A.
oSIST prEN 14664:2025
prEN 14664:2025 (E)
Introduction
With respect to potential adverse effects on the quality of water intended for human consumption, caused
by the product covered by this document:
a) this document provides no information as to whether the product may be used without restriction
in any of the Member States of the EU or EFTA;
b) it should be noted that, while awaiting the adoption of verifiable European criteria, existing national
regulations concerning the use and/or the characteristics of this product remain in force.
NOTE Conformity with this document does not confer or imply acceptance or approval of the product in any
or the Member States of the EU or EFTA. The use of the product covered by this document is subject to regulation
or control by National Authorities.
oSIST prEN 14664:2025
prEN 14664:2025 (E)
1 Scope
This document is applicable to iron (III) sulfate solid used for treatment of water intended for human
consumption. It describes the characteristics of iron (III) sulfate solid and specifies the requirements and
the corresponding analytical methods for iron (III) sulfate solid and
...