oSIST prEN 891:2025

Chemicals used for treatment of water intended for human consumption - Iron (III) chloride sulfate

This document is applicable to iron (III) chloride sulfate used for treatment of water intended for human consumption. It describes the characteristics of iron (III) chloride sulfate and specifies the requirements and the corresponding analytical methods for iron (III) chloride sulfate and gives information on its use in water treatment. It also determines the rules relating to safe handling (Annex B) and use of iron (III) chloride sulfate (Annex A).

Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Eisen(III)chloridsulfat

Dieses Dokument ist anzuwenden für Eisen(III)chloridsulfat zur Aufbereitung von Wasser für den menschlichen Gebrauch. Es beschreibt die Eigenschaften von Eisen(III)chloridsulfat und legt die Anforderungen sowie die entsprechenden Analysenverfahren für Eisen(III)chloridsulfat fest. Es enthält Angaben für dessen Anwendung in der Wasseraufbereitung. Es legt darüber hinaus Regeln für die sichere Handhabung (Anhang B) und Verwendung von Eisen(III)chloridsulfat fest (Anhang A).

Produits chimiques utilisés pour le traitement de l’eau destinée à la consommation humaine - Chlorosulfate de fer (III)

Le présent document s’applique au chlorosulfate de fer (III) utilisé pour le traitement de l’eau destinée à la consommation humaine. Il décrit les caractéristiques du chlorosulfate de fer (III) et spécifie les exigences et les méthodes d’analyse correspondantes. Il donne des informations sur son emploi dans le traitement de l’eau. Il fixe également les règles relatives à la sécurité de manipulation (Annexe B) et d’utilisation du chlorosulfate de fer (III) (Annexe A).

Kemikalije, ki se uporabljajo za pripravo pitne vode - Železov (III) klorid sulfat

General Information

• 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: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 04-Aug-2025
• Due Date: 22-Dec-2025
• Completion Date: 01-Oct-2025
• Ref Project: prEN 891 - Chemicals used for treatment of water intended for human consumption - Iron (III) chloride sulfate

Relations

• Revises: SIST EN 891:2023 - Chemicals used for treatment of water intended for human consumption - Iron (III) chloride sulfate
• Effective Date: 04-Dec-2024

Overview

The oSIST prEN 891:2025:2025 standard, published by the European Committee for Standardization (CEN), addresses the specifications for Iron (III) chloride sulfate used in the treatment of water intended for human consumption. This chemical plays a pivotal role in water purification processes, helping to ensure safe and clean drinking water. The document outlines the essential physical and chemical properties, purity criteria, safety handling practices, and analytical methods for assessing the quality of Iron (III) chloride sulfate solutions.

This standard is vital for manufacturers, water treatment plants, regulatory bodies, and safety professionals involved in water purification, ensuring uniformity and compliance with health and environmental safety requirements.

Key Topics

• Chemical Identification: Details the chemical name, synonyms (such as ferric chloride sulfate or ferric chloro sulfate), molecular mass (187.36 g/mol), empirical and chemical formulas (FeClSO4), CAS Registry Number (12410-14-9), and EINECS reference (235-649-0).
• Physical Properties: Iron (III) chloride sulfate usually appears as a dark brown solution with a density of approximately 1.5 g/cm³ at 20 °C. It is water-soluble with a boiling point near 102 °C and a freezing point below −10 °C. The viscosity is about 70 mPa·s at 10 °C. It exhibits acidic and corrosive chemical behavior.
• Purity Criteria: The standard sets minimum purity levels, specifying that the solution contains at least 37% FeClSO4 (approx. 11% Fe by mass) with certain allowable impurities:
  • Manganese limits vary by grade (0.5% to 2%)
  • Iron (II) is limited to a maximum of 0.2%
  • Insoluble matter restrictions indicate foreign material content These parameters ensure product safety and effectiveness in water treatment.
• Analytical Methods: Reference to EN 17215 standard methods for the analysis of iron-based coagulants provides the framework for sampling and testing product quality.
• Safety and Handling: Annex B establishes rules for safe storage, transportation, and handling, including emergency procedures such as first aid steps, spill response, and fire safety measures.
• Applications in Water Treatment: Annex A delivers invaluable guidance on using Iron (III) chloride sulfate-detailing its origin, manufacturing process, function as a coagulant, dosing recommendations, application forms, and management of secondary effects including removal of excess product.

Applications

Iron (III) chloride sulfate is primarily used as a coagulant in potable water treatment to remove suspended solids, reduce turbidity, and aid in the removal of impurities. Its benefits include:

• Enhancing the clarity and safety of drinking water supplies
• Reducing contaminants through chemical precipitation
• Supporting coagulation and flocculation stages in water treatment plants

Water treatment professionals rely on this chemical to meet rigorous water quality standards while ensuring regulatory compliance and protecting public health.

Related Standards

• EN 17215: Provides standardized analytical methods for iron-based coagulants including Iron (III) chloride sulfate. It supports accurate quality control during production and use.
• National regulations within EU and EFTA countries may also apply, governing the permissible use and safety requirements of this chemical.
• Other CEN standards under Technical Committee CEN/TC 164 “Water supply” address different chemicals and parameters integral to water treatment safety and efficacy.

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Keywords: Iron (III) chloride sulfate, water treatment chemical, potable water purification, water coagulant standard, CEN oSIST prEN 891:2025:2025, water treatment safety, iron-based coagulants, drinking water chemical specification, water treatment standards, safe handling water treatment chemicals.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2025
Kemikalije, ki se uporabljajo za pripravo pitne vode - Železov (III) klorid sulfat
Chemicals used for treatment of water intended for human consumption - Iron (III)
chloride sulfate
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Eisen
(III)chloridsulfat
Produits chimiques utilisés pour le traitement de l’eau destinée à la consommation
humaine - Chlorosulfate de fer (III)
Ta slovenski standard je istoveten z: prEN 891
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 Kemikalije za čiščenje vode Chemicals for purification of
water
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2025
ICS 71.100.80 Will supersede EN 891:2023
English Version
Chemicals used for treatment of water intended for human
consumption - Iron (III) chloride sulfate
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Chlorosulfate de menschlichen Gebrauch - Eisen(III)chloridsulfat
fer (III)
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 891:2025 E
worldwide for CEN national Members.

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 form . 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 Freezing 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 . 7
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 . 9
6.1 Sampling . 9
6.2 Analyses . 9
7 Labelling - Transportation - Storage . 9
7.1 Means of delivery . 9
7.2 Risk and safety labelling according to the EU Directives . 10
7.3 Transportation regulations and labelling . 10
7.4 Marking . 11
7.5 Storage . 11
7.5.1 Long term stability . 11
7.5.2 Storage incompatibilities . 11
Annex A (informative) General information on iron (III) chloride sulfate . 12
A.1 Origin . 12
A.1.1 Raw materials . 12
A.1.2 Manufacturing process . 12
A.2 Quality of commercial product . 12
A.3 Use . 14
A.3.1 Function . 14
A.3.2 Form in which it is used. 14
A.3.3 Treatment dose . 14
A.3.4 Means of application . 14
A.3.5 Secondary effects . 14
A.3.6 Removal of excess product . 14
Annex B (normative) General rules relating to safety . 15
B.1 Rules for safe handling and use . 15
B.2 Emergency procedures . 15
B.2.1 First aid . 15
B.2.2 Spillage . 15
B.2.3 Fire . 15
Bibliography . 16

European foreword
This document (prEN 891:2025) 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 891:2023.
— update of the information related to limit values in Table 2 and Annex A.

Introduction
In respect of 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
of 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.

1 Scope
This document is applicable to iron (III) chloride sulfate used for treatment of water intended for
human consumption. It describes the characteristics of iron (III) chloride sulfate and specifies the
requirements and the corresponding analytical methods for iron (III) chloride sulf
...