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

kSIST FprEN 891:2026 is a CEN draft European Standard for iron (III) chloride sulfate used in treatment of water intended for human consumption. It specifies the product description, purity criteria, analytical methods, labelling, transport, storage, and safety information for suppliers, laboratories, and water treatment users.

What does kSIST FprEN 891:2026 specify?

kSIST FprEN 891:2026 applies to iron (III) chloride sulfate used for treatment of water intended for human consumption. It brings together the product description, minimum purity requirements, test methods, and practical information on use and safety.

The document is organized into Clauses 1 to 7, with Annex A on general information and use, and Annex B on safety.

Annex	What it covers
A	Origin, manufacturing, quality of the commercial product, use, dose, application, secondary effects, and removal of excess product
B	General rules relating to safety, including first aid, spillage, and fire

What are the key requirements of kSIST FprEN 891:2026?

kSIST FprEN 891:2026 sets out how the product is identified, what purity it must meet, how it is tested, and how it is handled from delivery to storage. For users, the practical point is that product selection, acceptance testing, and site handling all have to match the same standard.

• Clause 4 identifies the material as an iron (III) chloride sulfate solution and gives its common names, chemical identifiers, and physical properties. It is described as a dark brown, acidic, corrosive solution, so users need compatible materials and suitable controls for handling.
• Clause 5.2 describes the expected commercial composition, including the iron (III) chloride sulfate and iron content and the permitted spread around the manufacturer’s declared values. In practice, buyers and quality managers use this to check whether a delivered batch matches the declared product strength.
• Clause 5.3 classifies the product into grades 1, 2, and 3 based on limits for manganese, iron(II), and insoluble matters. This matters because the grade gives a quick view of how clean the product is and how much foreign matter it may bring into treatment.
• Clause 5.4 classifies the product into types 1, 2, and 3 based on trace-metal limits for arsenic, cadmium, chromium, mercury, nickel, lead, antimony, and selenium. Users select the type with the treated water quality target and raw water conditions in mind.
• Clause 6 requires sampling and analysis to use the methods in EN 17215. That keeps release testing consistent between suppliers, laboratories, and users.
• Clause 7.1 to 7.5 cover delivery, labelling, transport, marking, and storage. The product is to be delivered in suitable non-corrosive tankers or containers, labelled as a hazardous substance, transported as class 8 corrosive material, and stored in plastics or rubber-lined containers or tanks away from metals, alkalis, and chlorine-releasing agents.
• Annex B gives the safety steps for handling incidents. It includes first aid for skin and eye contact, action for spillage, and the statement that the product is not combustible.

What terms does kSIST FprEN 891:2026 define?

• CAS Registry Number - The unique registry number used to identify the chemical substance.
• EINECS reference - The European inventory reference for an existing commercial chemical substance.
• GHS05 - The hazard pictogram used for corrosive substances.
• GHS07 - The hazard pictogram used for harmful or irritant substances.
• ADR - The European agreement for road transport of dangerous goods.
• RID - The rules for rail transport of dangerous goods.
• IMDG - The international code for transport of dangerous goods by sea.
• IATA - The air transport rules used for dangerous goods shipments.

Who uses kSIST FprEN 891:2026?

kSIST FprEN 891:2026 is used by manufacturers and suppliers of iron (III) chloride sulfate, water treatment operators, laboratory staff, quality managers, and buyers. It also supports transport and safety personnel who need the right class, marking, and storage rules, and national authorities that oversee treatment chemicals for drinking water.

What changed in kSIST FprEN 891:2026 from the previous edition?

kSIST FprEN 891:2026 will supersede EN 891:2023. The stated technical update is a revision of the limit-value information in Table 2 and Annex A.

Which standards are used with kSIST FprEN 891:2026?

• EN 17215 - Provides the sampling and analytical methods used for the product in Clause 6.

What does the kSIST FprEN 891:2026 document contain?

kSIST FprEN 891:2026 contains a product description, identification data, physical and chemical properties, purity criteria, and analytical method references. It also includes tables for product grades and types, plus transport and labelling information for hazardous goods handling.

Annex A adds general information on raw materials, manufacturing routes, use as a primary coagulant, dosing, application, secondary effects, and removal of excess product. Annex A also includes tables showing the possible impact of different product types on trace metals in treated water. Annex B gives practical safety instructions for normal handling and emergencies, including first aid, spill response, and fire guidance.

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
...