EN ISO 8502-5:2025

Preparation of steel substrates before application of paints and related products - Tests for the assessment of surface cleanliness - Part 5: Measurement of chloride on steel surfaces prepared for painting (ion detection tube method) (ISO 8502-5:2025)

This document describes a field test for the measurement of chloride ions using special detection tubes.
With suitable surface sampling techniques, this document is applicable to steel surfaces before and after cleaning, as well as to painted surfaces between applications of coats.

Vorbereitung von Stahloberflächen vor dem Auftragen von Beschichtungsstoffen - Prüfungen zum Beurteilen der Oberflächenreinheit - Teil5: Messung von Chloriden auf vorbereiteten Stahloberflächen (Verfahren zum Ionennachweis mit Prüfröhrchen) (ISO 8502-5:2025)

Dieses Dokument beschreibt eine Feldprüfung zur Bestimmung von Chloridionen mit speziellen Prüfröhrchen.
Zusammen mit geeigneten Probenahmeverfahren ist dieses Dokument auf Stahloberflächen vor und nach dem Reinigen sowie auf beschichtete Oberflächen zwischen dem Auftragen einzelner Schichten anwendbar.

Préparation des subjectiles d’acier avant application de peintures et de produits assimilés - Essais pour apprécier la propreté d’une surface - Partie 5: Mesurage des chlorures sur les surfaces d’acier préparées pour la mise en peinture (méthode du tube détecteur d’ions) (ISO 8502-5:2025)

Le présent document décrit une méthode d’essai in situ pour le mesurage des ions chlorure à l’aide de tubes détecteurs spécifiques.
Avec des techniques d’échantillonnage de surface appropriées, le présent document est applicable aux surfaces d’acier avant et après nettoyage ou aux surfaces peintes entre les applications de revêtements.

Priprava jeklenih podlag pred nanašanjem barv in sorodnih premazov - Preskusi za ocenjevanje čistosti površine - 5. del: Določanje klorida na jeklenih površinah, pripravljenih za barvanje (metoda ionske detekcije s cevko) (ISO 8502-5:2025)

Ta dokument opisuje terenski preskus za določanje kloridnih ionov z uporabo posebnih cevk za detekcijo. Z ustreznimi tehnikami vzorčenja površine se ta dokument uporablja za jeklene površine pred čiščenjem in po njem ter za barvane površine med nanosi premazov.

General Information

• Status: Published
• Publication Date: 24-Jun-2025
• ICS: 25.220.10 - Surface preparation
• Technical Committee: CEN/TC 139 - Paints and varnishes
• Drafting Committee: CEN/TC 139 - Paints and varnishes
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 25-Jun-2025
• Completion Date: 25-Jun-2025
• Ref Project: SIST EN ISO 8502-5:2025 - Preparation of steel substrates before application of paints and related products - Tests for the assessment of surface cleanliness - Part 5: Measurement of chloride on steel surfaces prepared for painting (ion detection tube method) (ISO 8502-5:2025)

Relations

• Replaces: EN ISO 8502-5:2004 - Preparation of steel substrates before application of paints and related products - Tests for the assessment of surface cleanliness - Part 5: Measurement of chloride on steel surfaces prepared for painting (ion detection tube method) (ISO 8502-5:1998)
• Effective Date: 01-Jul-2020

Overview

EN ISO 8502-5:2025 - "Preparation of steel substrates before application of paints and related products - Tests for the assessment of surface cleanliness - Part 5: Measurement of chloride on steel surfaces prepared for painting (ion detection tube method)" - specifies a field test method for measuring chloride ions on steel surfaces using special ion detection tubes. The procedure applies to steel before and after cleaning and to painted surfaces between coat applications. It is a CEN-adopted ISO document intended for on-site chloride assessment as part of surface cleanliness and coating quality control.

Key topics and technical requirements

• Principle: Remove a proportion of water- or acid-soluble chlorides by controlled extraction (washing or immersion) and analyse the collected extract using a silver chromate-based ion detection tube; chloride presence is indicated by a colour change.
• Apparatus & materials:
  • Chloride ion detection tube: borosilicate glass tube (140–150 mm length, 2–3 mm ID) containing ~5% silver chromate in silica sand (177–250 µm), retained by cotton plugs and glass powder; sealed ends.
  • Extraction solvent: as specified in ISO 8502-2 (water), ISO 8502-6 (Bresle method), or ISO 8502-15 (acid extraction).
  • Cutter, vessel and gloves for safe handling and sample presentation.
• Calibration & verification: Detection tubes must be calibrated against known chloride concentrations; verification tests and appropriate tube selection for the measurement range are required.
• Procedure and reporting: The standard covers extraction, determination of chloride concentration, expression of results, and required test-report content.

Practical applications

• On-site chloride screening during surface preparation and pre-paint inspections.
• Quality control for new coatings and maintenance painting to prevent underfilm corrosion caused by soluble chlorides.
• Fast verification of cleaning effectiveness after abrasive blasting, water jetting, or chemical cleaning.
• Integration into coating specification and acceptance criteria for structures exposed to marine or industrial environments.

Who should use this standard

• Coating inspectors and third‑party surveyors
• Surface‑preparation contractors and applicators
• Corrosion engineers and asset owners (bridges, offshore, industrial plants)
• Paint and coating manufacturers and specification writers
• Maintenance planners implementing ISO 12944-related corrosion protection strategies

Related standards

• ISO 8502-2 - Laboratory determination of chloride on cleaned surfaces
• ISO 8502-6 - Extraction of water‑soluble contaminants (Bresle method)
• ISO 8502-15 - Acid extraction of soluble contaminants
• ISO 12944-8 - Development of specifications for corrosion protection by paint systems

Keywords: EN ISO 8502-5:2025, chloride measurement, ion detection tube method, surface cleanliness, steel substrate preparation, Bresle method, paint inspection, coating quality control.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2025
Nadomešča:
SIST EN ISO 8502-5:2005
SIST ISO 8502-5:1998
Priprava jeklenih podlag pred nanašanjem barv in sorodnih premazov - Preskusi
za ocenjevanje čistosti površine - 5. del: Določanje klorida na jeklenih površinah,
pripravljenih za barvanje (metoda ionske detekcije s cevko) (ISO 8502-5:2025)
Preparation of steel substrates before application of paints and related products - Tests
for the assessment of surface cleanliness - Part 5: Measurement of chloride on steel
surfaces prepared for painting (ion detection tube method) (ISO 8502-5:2025)
Vorbereitung von Stahloberflächen vor dem Auftragen von Beschichtungsstoffen -
Prüfungen zum Beurteilen der Oberflächenreinheit - Teil5: Messung von Chloriden auf
vorbereiteten Stahloberflächen (Verfahren zum Ionennachweis mit Prüfröhrchen) (ISO
8502-5:2025)
Préparation des subjectiles d’acier avant application de peintures et de produits
assimilés - Essais pour apprécier la propreté d’une surface - Partie 5: Mesurage des
chlorures sur les surfaces d’acier préparées pour la mise en peinture (méthode du tube
détecteur d’ions) (ISO 8502-5:2025)
Ta slovenski standard je istoveten z: EN ISO 8502-5:2025
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.

EN ISO 8502-5
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2025
EUROPÄISCHE NORM
ICS 25.220.10 Supersedes EN ISO 8502-5:2004
English Version
Preparation of steel substrates before application of paints
and related products - Tests for the assessment of surface
cleanliness - Part 5: Measurement of chloride on steel
surfaces prepared for painting (ion detection tube
method) (ISO 8502-5:2025)
Préparation des subjectiles d'acier avant application de Vorbereitung von Stahloberflächen vor dem Auftragen
peintures et de produits assimilés - Essais pour von Beschichtungsstoffen - Prüfungen zum Beurteilen
apprécier la propreté d'une surface - Partie 5: der Oberflächenreinheit - Teil5: Messung von
Mesurage des chlorures sur les surfaces d'acier Chloriden auf vorbereiteten Stahloberflächen
préparées pour la mise en peinture (méthode du tube (Verfahren zum Ionennachweis mit Prüfröhrchen) (ISO
détecteur d'ions) (ISO 8502-5:2025) 8502-5:2025)
This European Standard was approved by CEN on 30 December 2024.

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. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists 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.
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. EN ISO 8502-5:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 8502-5:2025) has been prepared by Technical Committee ISO/TC 35 "Paints
and varnishes" in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” the
secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by December 2025, and conflicting national standards
shall be withdrawn at the latest by December 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 8502-5:2004.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: 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 the
United Kingdom.
Endorsement notice
The text of ISO 8502-5:2025 has been approved by CEN as EN ISO 8502-5:2025 without any
modification.
International
Standard
ISO 8502-5
Second edition
Preparation of steel substrates
2025-06
before application of paints and
related products — Tests for the
assessment of surface cleanliness —
Part 5:
Measurement of chloride on steel
surfaces prepared for painting (ion
detection tube method)
Préparation des subjectiles d’acier avant application de peintures
et de produits assimilés — Essais pour apprécier la propreté
d’une surface —
Partie 5: Mesurage des chlorures sur les surfaces d’acier
préparées pour la mise en peinture (méthode du tube détecteur
d’ions)
Reference number
ISO 8502-5:2025(en) © ISO 2025

ISO 8502-5:2025(en)
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 8502-5:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus and materials . 2
5.1 Extraction solvent.2
5.2 Chloride ion detection tube .2
5.2.1 Design . .2
5.2.2 Calibration . . .2
5.3 Cutter .2
5.4 Vessel .2
5.5 Gloves .2
6 Procedure . 2
6.1 Extraction of chloride . .2
6.2 Determination of the chloride concentration in the extract solution .3
6.3 Verification test.3
7 Expression of results . 3
8 Test report .
...