prEN ISO 8502-2
(Main)Preparation of steel substrates before application of paints and related products - Tests for the assessment of surface cleanliness - Part 2: Extraction of water-soluble contaminants for analysis by swabbing method (ISO/DIS 8502‑2:2026)
General Information
- Abstract
ISO 8502-2:2017 describes a method for the determination of chloride-containing salts that are readily soluble in water and are present on a steel surface. The method is also applicable to previously coated surfaces. ISO 8502-2:2017 includes a method, applicable in the field or in the laboratory, for washing off the surface while several methods are referred to for chloride analyses.
- Status
- Not Published
- Publication Date
- 06-Mar-2028
- Technical Committee
- CEN/TC 139 - Paints and varnishes
- Drafting Committee
- CEN/TC 139 - Paints and varnishes
- Current Stage
- 4020 - Submission to enquiry - Enquiry
- Start Date
- 13-Aug-2026
- Completion Date
- 13-Aug-2026
Overview
prEN ISO 8502-2 (Preparation of steel substrates before application of paints and related products - Tests for the assessment of surface cleanliness - Part 2: Extraction of water-soluble contaminants for analysis by swabbing method) specifies a practical procedure for assessing the cleanliness of steel surfaces prior to coating. Developed by CEN and aligned with ISO standards, this document outlines methods to extract and analyze water-soluble contaminants-particularly chloride-containing salts-using a swabbing technique. The standard applies both to uncoated and previously coated steel surfaces, making it essential for quality assurance in industrial painting and maintenance.
Maintaining optimal surface cleanliness is critical in preventing premature coating failures, such as blistering or corrosion, during industrial and infrastructure projects. prEN ISO 8502-2 supports industries in achieving best practices for surface preparation, ensuring long-term adhesion and durability for paints and related coatings.
Key Topics
- Surface Cleanliness Testing: The standard establishes a method for extracting water-soluble contaminants from steel surfaces using a controlled swabbing approach.
- Swabbing Procedure: It describes the technique for marking test areas, swabbing in defined directions, and transferring residues for analysis.
- Contaminant Assessment: Focuses on detecting water-soluble chlorides and other ions that can undermine coating performance.
- Field and Laboratory Use: The procedure is designed for both on-site assessments and laboratory environments, supporting broad application in industrial projects.
- Analysis Methods: The collected swab extracts can be evaluated using:
- Ion detection tubes (ISO 8502-5)
- Ion chromatography (ISO 10304-1)
- Conductometric and other analytical devices (ISO 8502-9)
- Reporting Requirements: The standard details minimum information needed in test reports, such as test area identification, solvent used, swabbing patterns, deviations, and environmental conditions.
Applications
prEN ISO 8502-2 is widely applicable in industries where protective coatings are critical:
- Construction and Infrastructure: Used in bridges, pipelines, storage tanks, and steel frameworks to ensure surfaces are properly prepared for painting or protective coatings.
- Shipbuilding and Marine Maintenance: Helps in assessing and preparing steel surfaces exposed to aggressive saline environments, reducing risk of corrosion and coating breakdown.
- Manufacturing: Supports quality control in fabricated steel parts before the application of paints or powder coatings.
- Maintenance and Refurbishment: Applicable for periodic assessment and preparation of previously coated or in-service steel structures during maintenance cycles.
Using prEN ISO 8502-2 as part of standard operating procedures enhances reliability and longevity of coatings, reduces costly rework or premature failures, and helps meet contractual or regulatory requirements for surface preparation.
Related Standards
Compliance with prEN ISO 8502-2 is complemented by several related standards in the ISO 8502 series and beyond:
- ISO 8502-5: Measurement of chloride on steel surfaces prepared for painting using ion detection tubes.
- ISO 8502-9: Field method for conductometric determination of water-soluble salts.
- ISO 10304-1: Water quality - Determination of dissolved anions by liquid chromatography of ions.
- ISO 3696: Water for analytical laboratory use - Specification and test methods.
- Other Parts of ISO 8502: Cover additional methods of assessing surface cleanliness, including dust, oil, and other contaminants.
By integrating prEN ISO 8502-2 and these related standards into coatings application workflows, organizations can achieve higher assurance of surface cleanliness, leading to improved protective performance and compliance with global best practices in surface preparation.
Relations
- Effective Date
- 19-Jun-2024
Get Certified
Connect with accredited certification bodies for this standard
DVS-ZERT GmbH
German welding certification society.
CARES (UK Certification Authority for Reinforcing Steels)
UK certification for reinforcing steels and construction.
EWF/IIW (European/International Welding Federation)
International welding personnel certification.
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Frequently Asked Questions
prEN ISO 8502-2 is a draft published by the European Committee for Standardization (CEN). Its full title is "Preparation of steel substrates before application of paints and related products - Tests for the assessment of surface cleanliness - Part 2: Extraction of water-soluble contaminants for analysis by swabbing method (ISO/DIS 8502‑2:2026)". This standard covers: ISO 8502-2:2017 describes a method for the determination of chloride-containing salts that are readily soluble in water and are present on a steel surface. The method is also applicable to previously coated surfaces. ISO 8502-2:2017 includes a method, applicable in the field or in the laboratory, for washing off the surface while several methods are referred to for chloride analyses.
ISO 8502-2:2017 describes a method for the determination of chloride-containing salts that are readily soluble in water and are present on a steel surface. The method is also applicable to previously coated surfaces. ISO 8502-2:2017 includes a method, applicable in the field or in the laboratory, for washing off the surface while several methods are referred to for chloride analyses.
prEN ISO 8502-2 is classified under the following ICS (International Classification for Standards) categories: 25.220.10 - Surface preparation. The ICS classification helps identify the subject area and facilitates finding related standards.
prEN ISO 8502-2 has the following relationships with other standards: It is inter standard links to EN ISO 8502-2:2017. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
prEN ISO 8502-2 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2026
Priprava jeklenih podlag pred nanašanjem barv in sorodnih premazov - Preskusi
za ocenjevanje čistosti površine - 2. del: Ekstrakcija v vodi topnih onesnaževal za
analizo z metodo brisanja (s tamponi) (ISO/DIS 8502-2:2026)
Preparation of steel substrates before application of paints and related products - Tests
for the assessment of surface cleanliness - Part 2: Extraction of water-soluble
contaminants for analysis by swabbing method (ISO/DIS 8502-2:2026)
Vorbereitung von Stahluntergründen vor dem Auftragen von Beschichtungsstoffen und
verwandten Produkten - Prüfungen zur Beurteilung der Oberflächenreinheit - Teil 2:
Laborbestimmung von Chlorid auf gereinigten Oberflächen (ISO/DIS 8502-2:2026)
Préparation des subjectiles d'acier avant application de peintures et de produits
assimilés - Essais pour apprécier la propreté d'une surface - Partie 2: Extraction des
contaminants solubles dans l'eau pour analyse à l'aide de la méthode par tamponnage
(ISO/DIS 8502-2:2026)
Ta slovenski standard je istoveten z: prEN ISO 8502-2
ICS:
25.220.10 Priprava površine Surface preparation
87.020 Postopki za nanašanje Paint coating processes
barvnih premazov
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
International
Standard
ISO/DIS 8502-2
ISO/TC 35/SC 12
Preparation of steel substrates
Secretariat: BSI
before application of paints and
Voting begins on:
related products — Tests for the
2026-08-14
assessment of surface cleanliness —
Voting terminates on:
2026-11-06
Part 2:
Extraction of water-soluble
contaminants for analysis by
swabbing method
ICS: 25.220.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
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.
Reference number
ISO/DIS 8502-2:2026(en)
DRAFT
ISO/DIS 8502-2:2026(en)
International
Standard
ISO/DIS 8502-2
ISO/TC 35/SC 12
Preparation of steel substrates
Secretariat: BSI
before application of paints and
Voting begins on:
related products — Tests for the
assessment of surface cleanliness —
Voting terminates on:
Part 2:
Extraction of water-soluble
contaminants for analysis by
swabbing method
ICS: 25.220.10
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: +41 22 749 01 11
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 8502-2:2026(en)
ii
ISO/DIS 8502-2:2026(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus and materials . 2
5.1 General .2
5.2 Water .2
5.3 Marking options .2
5.4 Graduated beaker .2
5.5 Gloves .2
5.6 Absorbent cotton pads.2
5.7 Measuring cylinder .2
5.8 Glass rod .2
5.9 Contact thermometer .3
6 Procedure . 3
6.1 Blank test .3
6.2 Washing the test area .3
6.3 Extraction by swabbing .3
6.4 Soluble deposition concentration measurement method by ion detection tube .3
6.5 Soluble deposition concentration measurement method by ion chromatography .3
6.6 Soluble deposition concentration measurement method by other analysis devices .4
7 Test report . 4
iii
ISO/DIS 8502-2:2026(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenanc
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