1、BS EN ISO 8502-4:2017Preparation of steel substratesbefore application of paintsand related products Testsfor the assessment of surfacecleanlinessPart 4: Guidance on the estimation of theprobability of condensation prior to paintapplication (ISO 8502-4:2017)BSI Standards PublicationWB11885_BSI_Stand
2、ardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN ISO 8502-4:2017 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO8502-4:2017. It supersedes BS EN ISO 8502-4:2000 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/21
3、, Paint systems and surface preparation for metallicsubstrates.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. Th
4、e British Standards Institution 2017. Published by BSI Standards Limited 2017ISBN 978 0 580 76075 4ICS 17.040.20; 25.220.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Commi
5、ttee on 28 February 2017.Amendments/Corrigenda issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8502-4 February 2017 ICS 25.220.10 Supersedes EN ISO 8502-4:1999English Version Preparation of steel substrates before application of paints and related p
6、roducts - Tests for the assessment of surface cleanliness - Part 4: Guidance on the estimation of the probability of condensation prior to paint application (ISO 8502-4:2017) Prparation des subjectiles dacier avant application de peintures et de produits assimils - Essais pour apprcier la propret du
7、ne surface - Partie 4: Principes directeurs pour lestimation de la probabilit de condensation avant application de peinture (ISO 8502-4:2017) Vorbereitung von Stahloberflchen vor dem Auftragen von Beschichtungsstoffen - Prfungen zum Beurteilen der Oberflchenreinheit - Teil 4: Anleitung zum Abschtzen
8、 der Wahrscheinlichkeit von Taubildung vor dem Beschichten (ISO 8502-4:2017) This European Standard was approved by CEN on 19 September 2016. 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 nat
9、ional 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 ve
10、rsion 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,
11、 Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and Unite
12、d Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN I
13、SO 8502-4:2017 EBS EN ISO 8502-4:2017EN ISO 8502-4:2017 (E) 3 European foreword This document (EN ISO 8502-4:2017) 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
14、 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 August 2017, and conflicting national standards shall be withdrawn at the latest by August 2017. Attention is drawn to the possibility that so
15、me of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 8502-4:1999. According to the CEN-CENELEC Internal Regulations, the national standards organization
16、s of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
17、Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 8502-4:2017 has been approved by CEN as EN ISO 8502-4:2017 without any modification. BS EN ISO 8502-4:2017ISO 8502-4:2017(E)Forewo
18、rd ivIntroduction vi1 Scope . 12 Normative references 13 Probability of condensation . 14 Instruments . 25 Procedure. 36 Test report . 3Annex A (informative) Table for determination of dew-point . 5Bibliography .26 ISO 2017 All rights reserved iiiContents PageBS EN ISO 8502-4:2017ISO 8502-4:2017(E)F
19、orewordISO (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 tec
20、hnical 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 o
21、f electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document
22、 was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all suc
23、h patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and d
24、oes not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www
25、 .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 12, Preparation of steel substrates before application of paints and related products.This second edition cancels and replaces the first edition (ISO 8502-4:1993), which
26、 has been technically revised with the following changes:a) normative references have been updated;b) mercury thermometer has been replaced by thermometer in Clause 4 a);c) additional information is given in the note to Clause 4 b);d) combined instrument described in Clause 4 d);e) notes on instrume
27、nt properties have been added in Clause 4;f) in 5.2, “at a given atmospheric pressure” has been added to read “Their parameters are airtemperature and relative humidity at a given atmospheric pressure”;g) in 5.3, it has been added that non-contact thermometers should not be used;h) 5.4 has been chan
28、ged to account for the definition of high and low risk of condensation given inClause 3;i) description of the procedure with combined instruments has been added in 5.5.j) a reference to the formula used in Annex A has been added.ISO 8502 consists of the following parts, under the general title Prepa
29、ration of steel substrates before application of paints and related products Tests for the assessment of surface cleanliness: Part 2: Laboratory determination of chloride on cleaned surfaces Part 3: Assessment of dust on steel surfaces prepared for painting (pressure-sensitive tape method)iv ISO 201
30、7 All rights reservedBS EN ISO 8502-4:2017ISO 8502-4:2017(E) Part 4: Guidance on the estimation of the probability of condensation prior to paint application Part 5: Measurement of chloride on steel surfaces prepared for painting (ion detection tube method) Part 6: Extraction of soluble contaminants
31、 for analysis The Bresle method Part 9: Field method for the conductometric determination of water-soluble salts Part 11: Field method for the turbidimetric determination of water-soluble sulfate Part 12: Field method for the titrimetric determination of water-soluble ferrous ions ISO 2017 All right
32、s reserved vBS EN ISO 8502-4:2017ISO 8502-4:2017(E)IntroductionThe performance of protective coatings of paint and related products applied to steel is significantly affected by the state of the steel surface immediately prior to painting. The principal factors that are known to influence this perfo
33、rmance are as follows:a) presence of rust and mill scale;b) presence of surface contaminants, including salts, dust, oils and greases;c) surface profile.The ISO 8501, ISO 8502 and ISO 8503 series of International Standards have been prepared to provide methods of assessing these factors, while the I
34、SO 8504 series provides guidance on the preparation methods that are available for cleaning steel substrates, indicating the capabilities of each in attaining specified levels of cleanliness.These series of International Standards do not contain recommendations for the protective coating systems to
35、be applied to the steel surface. Neither do they contain recommendations for the surface quality requirements for specific situations even though surface quality can have a direct influence on the choice of protective coating to be applied and on its performance. Such recommendations are found in ot
36、her documents such as national standards and codes of practice. It will be necessary for the users of these International Standards to ensure that the qualities specified are compatible and appropriate both for the environmental conditions to which the steel will be exposed and for the protective co
37、ating system to be used, and within the capability of the cleaning procedure specified.The four series of International Standards referred to above deal with the following aspects of preparation of steel substrates before application of paints and related products: ISO 8501 on visual assessment of s
38、urface cleanliness; ISO 8502 on tests for the assessment of surface cleanliness; ISO 8503 on surface roughness characteristics of blast-cleaned steel substrates; ISO 8504 on surface preparation methods.Each of these International Standards is in turn divided into separate parts.Some paints (but not
39、all) require dry surfaces when being applied to steel structures. Thin films of condensed water on steel surfaces are mostly invisible. It is therefore important to have a method by which the probability of condensation can be estimated prior to the application of paint.vi ISO 2017 All rights reserv
40、edBS EN ISO 8502-4:2017INTERNATIONAL STANDARD ISO 8502-4:2017(E)Preparation of steel substrates before application of paints and related products Tests for the assessment of surface cleanliness Part 4: Guidance on the estimation of the probability of condensation prior to paint application1 ScopeThi
41、s part of ISO 8502 gives guidance on the estimation of the probability of condensation on a surface to be painted. It may be used to establish whether conditions at the job site are suitable for painting or not.2 Normative referencesThe following documents, in whole or in part, are normatively refer
42、enced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 8601, Data elements and interchange formats Information interchange Rep
43、resentation of dates and times3 Probability of condensationThe relative humidity of the air and the steel surface temperature are the basis for the estimation of the probability of condensation, but there is no simple rule to employ. The situation is complex because there are a multitude of factors
44、which have an influence on the condensation and evaporation of moisture, such as heat conductance of the structure, solar radiation on the surface, flow of ambient air around the structure, and contamination by hygroscopic substances on the surface.These factors sometimes provoke wetting or prevent
45、drying locally on the surface, e.g. where the surface temperature remains low or tends to fall due to heat losses or where the air becomes quickly saturated due to reduced ventilation. Naturally, the same factors sometimes have the opposite effect. Therefore, any test results should be interpreted w
46、ith the greatest care.Unless otherwise agreed, the steel surface temperature should generally be at least 3 C above the dew-point when paints are used.NOTE 1 For paints that are tolerant to moisture on the surface, a temperature difference less than 3 C might be acceptable.Other temperature differen
47、ces may be specified by the paint manufacturer or agreed by the interested parties. ISO 2017 All rights reserved 1BS EN ISO 8502-4:2017ISO 8502-4:2017(E)If the difference between the surface temperature and the dew-point is below or will fall below the required and/or agreed minimum, the probability
48、 of condensation should be considered as being “high”.If the difference is above and will remain above the required and/or agreed minimum, the probability of condensation should be considered as being “low”.It is important to judge whether a temperature drop, sufficient to cause condensation, is lik
49、ely to occur during the critical period. Table 1 may be used to help with this determination.If the relative humidity is 85 % or higher, then painting should be judged critically as the dew-point is a maximum of 2,5 C away.If the relative humidity is high (92 % or dew-point 1,3 C away), painting should only be considered if conditions can be confidently expected to remain static or improve during the application and drying period.NOTE 2 This period is usually approximately 6 h.If the relative humidity is apparently s
