FprEN 14664

• 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: 16-Dec-2026
• ICS: 71.100.80 - Chemicals for purification of water
• Technical Committee: CEN/TC 164 - Water supply
• Drafting Committee: CEN/TC 164/WG 9 - Drinking water treatment
• Current Stage: 5020 - Submission to Vote - Formal Approval
• Start Date: 27-Aug-2026
• Due Date: 25-Nov-2026
• Completion Date: 27-Aug-2026
• Ref Project: kSIST FprEN 14664:2026 - Chemicals used for treatment of water intended for human consumption - Iron (III) sulfate, solid

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

FprEN 14664 is a draft European Standard from CEN, the European Committee for Standardization, for iron (III) sulfate, solid used in treatment of water intended for human consumption. It specifies how the product is identified, which purity limits apply, how samples and analyses are taken, and how the product is labelled, transported, stored, and handled safely.

It is aimed at manufacturers, laboratories, water treatment operators, and purchasers who need a common basis for checking product quality and its use in drinking water treatment.

What does FprEN 14664 specify?

FprEN 14664 applies to iron (III) sulfate, solid for treatment of water intended for human consumption. It covers product description, purity criteria, analytical methods, and practical information on use and safe handling.

The document is organized into clauses 1 to 7, with two annexes:

Annex	What it covers
Annex A	General information on iron (III) sulfate, solid, including origin, manufacture, quality, use, dose, application, secondary effects, and removal of excess product
Annex B	Normative safety rules, including handling and emergency procedures

Clause 4 describes the product, Clause 5 sets purity criteria, Clause 6 gives test methods, and Clause 7 covers labelling, transportation, and storage. That structure helps a reader move from product identification to compliance checks and then to practical use.

What are the key requirements of FprEN 14664?

FprEN 14664 sets three main control points: what the product is, what purity it must meet, and how it must be handled and labelled in practice.

• Identification in Clause 4 - The standard identifies the product as iron (III) sulfate, solid, also called ferric sulfate, solid. It gives the chemical identifiers and states that the product is available as free-flowing granules or powder. In practice, this fixes the exact material being bought or tested.

• Composition in Clause 5.2 - The commercial product typically contains not less than 64 % Fe2(SO4)3 or not less than 18 % Fe, within ±3 % of the manufacturer’s declared values. This tells buyers and quality staff what minimum active content to check against declared product data.

• Grades in Clause 5.3 - The product is classified into grades 1, 2, and 3 using limits for manganese, Fe(II), and insoluble matters. The note explains why Fe(II) matters: it is less effective as a coagulant and can persist at lower pH values. This helps users choose a grade suited to process performance and impurity control.

• Types in Clause 5.4 - The product is classified into types 1, 2, and 3 using limits for trace metals such as arsenic, cadmium, chromium, mercury, nickel, lead, antimony, and selenium. In practice, this is the key section for assessing how much each product may add to treated water.

• Sampling and analysis in Clause 6 - Sampling and analytical methods are taken from EN 17215. That means laboratories do not invent their own procedure when checking conformity.

• Delivery, labelling, and transport in Clause 7 - The product must be delivered in suitable bags or lined bulk trucks, labelled with the product name, trade name, grade, type, net mass, supplier or manufacturer, and the statement that it conforms to EN 14664. The transport section also states that it is not classified as a dangerous product for road, rail, sea, or air transport.

• Storage in Clause 7.5 - The product is stable below 50 % relative humidity and should be kept away from water because the solution is acidic and corrosive. This matters for warehouse conditions and for avoiding damaged packaging or product degradation.

• Safety in Annex B - The normative safety rules require current safety instructions, first aid actions for skin, eyes, and swallowing, spill clean-up steps, and note that the product is not combustible. This supports site safety procedures and training.

What terms does FprEN 14664 define?

FprEN 14664 does not list formal terms and definitions, but it uses several key terms consistently.

• Grade - A quality class in Table 1 based on impurity limits for manganese, Fe(II), and insoluble matters.
• Type - A trace-metal class in Table 2 based on limits for arsenic, cadmium, chromium, mercury, nickel, lead, antimony, and selenium.
• Fe(III) - Ferric iron, the basis used for several concentration limits and for describing the product’s chemical state.
• Primary coagulant - The function given in Annex A for this product in water treatment.
• eSDS - Extended safety data sheet, which should carry precautionary statements for the substance.
• CAS Registry Number - The chemical identifier used for iron (III) sulfate, solid in Clause 4.

Who uses FprEN 14664?

FprEN 14664 is used by drinking water chemical manufacturers, water treatment plant operators, laboratory analysts, and procurement or quality teams. Manufacturers use it to declare product identity, composition, grade, type, and labelling. Laboratories use it with EN 17215 for sampling and analysis. Water utilities and buyers use it to select a product that fits raw water quality, dosage needs, and treated-water quality targets.

What changed in FprEN 14664 from the previous edition?

FprEN 14664 will supersede EN 14664:2023. The stated technical change is an update of the information related to limit values in Table 2 and Annex A.

Which standards are used with FprEN 14664?

• EN 17215 - Provides the analytical methods used for sampling and analysis in Clause 6.
• Directive (EU) 2020/2184 - Used in Annex A as the drinking water quality reference for parametric values.
• Regulation (EC) No 1272/2008 - Used in Clause 7.2 for classification, labelling, and packaging of the substance and mixture.

What does the FprEN 14664 document contain?

The document contains a detailed identification section, physical and chemical property data, purity criteria, and the test methods needed to check compliance. It also includes a labelling example, transport and storage guidance, and safety instructions for handling spills and exposure.

Annex A gives practical background on raw materials, manufacturing, product quality, dosing, application, and how excess product is removed from water. It also shows how different types can affect trace metal content in treated water. Annex B gives emergency actions for skin contact, eye contact, swallowing, 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
...