kSIST FprEN 891:2026

• Abstract:

  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 specifies the rules relating to safe handling (Annex B) and describes the use of iron (III) chloride sulfate (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: 28-Aug-2026
• Due Date: 16-Oct-2026
• Completion Date: 02-Sep-2026
• Ref Project: FprEN 891 - Chemicals used for treatment of water intended for human consumption - Iron (III) chloride sulfate

• 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

kSIST FprEN 891:2026 specifies requirements for iron (III) chloride sulfate used in the treatment of water intended for human consumption. Developed by SIST and aligned with European standardization practices, this document covers product characteristics, purity criteria, analytical test methods, safe handling, labelling, and storage. Iron (III) chloride sulfate serves as a primary coagulant in water treatment processes, helping ensure effective removal of suspended solids and contaminants.

Meeting the criteria set out by this standard supports water treatment facilities in demonstrating compliance with regulatory requirements, especially those linked to the safety and quality of drinking water. The standard also outlines practices for reducing potentially hazardous impurities and assures that the coagulant’s use will not adversely affect the water’s overall safety for human consumption.

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Key Topics

• Product Identification

  • Chemical name: Iron (III) chloride sulfate solution
  • Common names: Ferric chloride sulfate, chlorinated copperas
  • CAS number: 12410-14-9
  • EINECS reference: 235-649-0

• Physical and Chemical Properties

  • Appearance: Dark brown solution
  • Density: ~1.5 g/cm³ at 20°C
  • Solubility: Dilutable in water
  • Boiling point: 102°C at 100 kPa
  • The solution is acidic and corrosive

• Purity and Impurity Limits

  • Specifies minimum purity criteria for iron (III) chloride sulfate
  • Limits defined for impurities, including arsenic, cadmium, chromium, mercury, nickel, lead, antimony, selenium, and iron (II)
  • Product grades and types correspond to different trace metal thresholds

• Analytical Methods

  • Refers to EN 17215 for sampling and analysis procedures

• Labelling and Transportation

  • Requires compliance with EU regulations on classification and packaging
  • Product is classified as UN 3264, Class 8 (corrosive)
  • Proper labelling and safety information must be included

• Handling and Storage

  • Guidance on long-term stability, suitable storage materials, and chemical incompatibilities
  • Recommendations for cleaning storage tanks and safe handling practices

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Applications

Iron (III) chloride sulfate is primarily used as a coagulant in drinking water treatment processes. Its main functions include:

• Removal of Suspended Solids: Facilitates aggregation of fine particles, improving sedimentation and filtration efficacy.
• Reduction of Contaminants: Aids in the precipitation and removal of metals, organic matter, and microorganisms.
• Regulation of Water Quality: Assists in maintaining compliance with drinking water standards by minimizing impurities in treated water.

Practical Use Recommendations:

• The product can be dosed as supplied or in diluted form using acid-resistant pumps.
• Dosing is tailored to raw water characteristics and operational parameters, with typical treatment doses between 4 and 10 g Fe/m³.
• Operators should monitor for increased chloride, sulfate, and a reduction in water alkalinity and pH.
• Safe handling procedures are mandatory due to the product’s acidic and corrosive properties.

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Related Standards

Those using or referencing kSIST FprEN 891:2026 may also benefit from familiarity with other standards and guidelines:

• EN 17215: Analytical methods for iron-based coagulants used in the treatment of water intended for human consumption
• Directive (EU) 2020/2184: Drinking Water Directive, specifying quality parameters for water intended for human consumption
• Regulation (EC) No 1272/2008: Classification, labelling, and packaging of substances and mixtures in the EU (CLP)
• National regulations: Variations may exist regarding acceptance and use of iron-based coagulants in drinking water treatment

This standard is essential for chemical suppliers, water utility managers, quality assurance personnel, and regulators seeking to ensure the safe, effective, and compliant use of iron (III) chloride sulfate in the production of safe drinking water.

SLOVENSKI STANDARD
oSIST prEN 891:2025
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
oSIST prEN 891:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 891:2025
oSIST prEN 891:2025
DRAFT
EUROPEAN STANDARD
prEN 891
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.

oSIST prEN 891:2025
prEN 891:2025 (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 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
oSIST prEN 891:2025
prEN 891:2025 (E)
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

oSIST prEN 891:2025
prEN 891:2025 (E)
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.
prEN 891:2025 includes the following significant technical changes with respect to EN 891:2023:
— update of the information related to limit values in Table 2 and Annex A.

oSIST prEN 891:2025
prEN 891:2025 (E)
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.

oSIST prEN 891:2025
prEN 891:2025 (E)
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
...