kSIST FprEN 14664:2026

• 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
• Public Enquiry End Date: 29-Sep-2025
• ICS: 13.060.20 - Drinking water
• ICS: 71.100.80 - Chemicals for purification of water
• Technical Committee: IOVO - Water supply and waste water engineering
• Current Stage: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 04-Sep-2026
• Due Date: 23-Oct-2026
• Completion Date: 07-Sep-2026
• Ref Project: FprEN 14664 - Chemicals used for treatment of water intended for human consumption - Iron (III) sulfate, solid

• Revises: SIST EN 14664:2023 - Chemicals used for treatment of water intended for human consumption - Iron (III) sulfate, solid
• Effective Date: 11-Dec-2024

kSIST FprEN 14664:2026 specifies iron (III) sulfate, solid for treatment of water intended for human consumption. It sets the product description, purity criteria, analytical methods, labelling, transport, storage and safety rules for manufacturers, suppliers and water-treatment users. The document is a draft European Standard from CEN/TC 164 and it is intended to replace EN 14664:2023.

What does kSIST FprEN 14664:2026 specify?

kSIST FprEN 14664:2026 applies to the solid form of iron (III) sulfate used in drinking water treatment. It describes the product, sets requirements and test methods, and gives practical information on handling and use.

The document is organized into seven clauses, plus two annexes and a bibliography. Clause 1 states the scope, Clause 2 gives the normative reference, Clause 4 describes the product, Clause 5 sets purity criteria, Clause 6 covers test methods, and Clause 7 covers labelling, transportation and storage.

Annex	What it covers
Annex A	General information on iron (III) sulfate solid, including origin, manufacture, quality and use
Annex B	General rules relating to safety, including safe handling and emergency procedures

The introduction also notes that conformity with the document does not by itself give approval for use in any EU or EFTA member state, because national regulations still apply.

What are the key requirements of kSIST FprEN 14664:2026?

kSIST FprEN 14664:2026 is built around product identification, purity control, analytical verification and safe handling. In practice, it tells you what the product is, how clean it must be, how to check it, and how to store and label it.

• Clause 4 identifies the substance by chemical name, synonym, formula information, CAS Registry Number® and EINECS reference, and describes its commercial forms and physical and chemical properties. This matters because buyers and labs need to confirm they are using the correct material and form.
• Clause 5.2 requires the commercial product to match the manufacturer’s declared composition within the stated tolerance. In practice, procurement and quality teams need to compare delivery documents with declared product content.
• Clause 5.3 sets three grades based on limits for manganese, Fe(II) and insoluble matter. This lets users select a product quality that matches the treatment process and the acceptable impurity level.
• Clause 5.4 sets three types based on trace-metal limits such as arsenic, cadmium, chromium, mercury, nickel, lead, antimony and selenium. This matters when the raw water, dosage or local rules require tighter control of trace-metal input.
• Clause 6 requires sampling and analysis to follow EN 17215. That gives users a single analytical reference for checking whether a batch meets the product requirements.
• Clause 7 covers delivery, labelling, transport and storage. The document requires suitable packaging or lined bulk transport, product marking, and storage conditions that avoid moisture and incompatible contact with water.
• Annex A explains typical use as a primary coagulant, the form in which it may be dosed, typical dose range, and secondary effects such as lower pH and higher sulfate content. That helps operators set the treatment process and anticipate water-quality changes.
• Annex B gives the safety rules for handling, first aid, spill response and fire response. This is the part plant staff use when writing site procedures and training operators.

What terms does kSIST FprEN 14664:2026 use?

• Iron (III) sulfate, solid - The solid ferric sulfate product covered by the standard.
• Grade - A product quality class in Table 1, based on limits for manganese, Fe(II) and insoluble matter.
• Type - A product purity class in Table 2, based on trace-metal limits.
• Primary coagulant - The treatment chemical used to destabilize particles in raw water.
• eSDS - Extended safety data sheet, which carries the safety and precautionary statements for the substance.
• CAS Registry Number® - The chemical registry identifier used to identify the substance precisely.
• EINECS reference - The European inventory reference used for chemical identification.
• UN number - The transport identifier used for dangerous goods classification and shipping.

Who uses kSIST FprEN 14664:2026?

kSIST FprEN 14664:2026 is used by manufacturers and suppliers of water-treatment chemicals, drinking water utilities, laboratory staff, quality managers and buyers. They use it to specify the product, check batch conformity, choose a grade and type, prepare labels and safety instructions, and decide on storage and transport conditions.

It is also relevant for plant operators who dose iron (III) sulfate solid as a coagulant and need to manage the effects on pH, alkalinity, sulfate and sludge removal.

What changed in kSIST FprEN 14664:2026 from the previous edition?

kSIST FprEN 14664:2026 supersedes EN 14664:2023. The draft states one significant technical change: updated information related to the limit values in Table 2 and Annex A.

Which standards are used with kSIST FprEN 14664:2026?

The normative reference in the document is EN 17215, which provides the sampling and analytical methods used to check iron-based coagulants. That is the standard users rely on for test work under Clause 6.

The bibliography also points to Directive (EU) 2020/2184 for drinking water quality context and to Regulation (EC) No 1272/2008 for classification, labelling and packaging. These texts matter because they frame water-quality targets and the hazard communication used on the product label and safety data sheet.

What does the kSIST FprEN 14664:2026 document contain?

kSIST FprEN 14664:2026 contains a product description section with identification data, commercial forms and physical and chemical properties. It also contains purity criteria tables for grades and types, plus a test section that sends sampling and analysis to EN 17215.

The document includes labelling, transportation and storage instructions, including an example hazard label and marking requirements. Annex A adds manufacturing background, quality context and a practical description of use, while Annex B gives the safety rules and emergency actions for skin, eye, ingestion, spillage and fire.

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
...