1、BSI Standards PublicationBS EN ISO 7784-3:2016Paints and varnishes Determination of resistance toabrasionPart 3: Method with abrasive-paper coveredwheel and linearly reciprocating testspecimen (ISO 7784-3:2016)BS EN ISO 7784-3:2016 BRITISH STANDARDNational forewordThis British Standard is the UK imp
2、lementation of EN ISO7784-3:2016. It supersedes BS EN ISO 7784-3:2006 which iswithdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee STI/10, Test methods for paints.A list of organizations represented on this committee can beobtained on request to its secretary.This pu
3、blication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 86187 1ICS 87.040Compliance with a British Standard cannot confer immunity f
4、romlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 7784-3 April 2016 ICS 87.040
5、Supersedes EN ISO 7784-3:2006English Version Paints and varnishes - Determination of resistance to abrasion - Part 3: Method with abrasive-paper covered wheel and linearly reciprocating test specimen (ISO 7784-3:2016) Peintures et vernis - Dtermination de la rsistance labrasion - Partie 3: Mthode ut
6、ilisant une roue revtue de papier abrasif et Mthode utilisant une roue revtue de papier abrasif et une prouvette anime dun mouvement de va-et-vient linaire (ISO 7784-3:2016) Beschichtungsstoffe - Bestimmung des Abriebwiderstandes - Teil 3: Verfahren mit schleifpapierbelegtem Rad und sich hin- und he
7、rbewegender Probe (ISO 7784-3:2016) This European Standard was approved by CEN on 27 February 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 national standard without any alteration. Up-
8、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 transl
9、ation 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
10、, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION
11、COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2016 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 7784-3:2016 EBS EN ISO 7784-3:2016EN ISO 7784-3
12、:2016 (E) 3 European foreword This document (EN ISO 7784-3:2016) 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 st
13、atus of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2016, and conflicting national standards shall be withdrawn at the latest by October 2016. Attention is drawn to the possibility that some of the elements of this document may be the s
14、ubject 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 7784-3:2006. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implem
15、ent 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, Netherlands, Norway, Poland, Portugal, Romania,
16、Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 7784-3:2016 has been approved by CEN as EN ISO 7784-3:2016 without any modification. BS EN ISO 7784-3:2016ISO 7784-3:2016(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13
17、Terms and definitions . 14 Principle 25 Apparatus and materials 36 Test specimens 46.1 Preparation of test specimens . 46.2 Film thickness 46.3 Conditioning 47 Procedure. 47.1 Agreements 47.2 Preparation of the abrasive wheel . 47.3 Test conditions 57.4 Number of determinations . 57.5 General test p
18、rocedure . 57.6 Procedure of the pre-test . 57.7 Procedure of the main test 68 Evaluation of the main test 68.1 Loss in mass by abrasion 68.2 Abrasion resistance . 69 Precision . 69.1 General . 69.2 Repeatability limit 69.3 Reproducibility limit 610 Test report . 7Bibliography 8 ISO 2016 All rights
19、reserved iiiContents PageBS EN ISO 7784-3:2016ISO 7784-3:2016(E)ForewordISO (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 com
20、mittees. 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
21、 International Electrotechnical Commission (IEC) on all matters of 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 th
22、e different types of ISO documents should be noted. This document 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. IS
23、O shall not be held responsible for identifying any or all such 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 docum
24、ent is information given for the convenience of users and does 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 WTO principles in the Technical Barriers to Trade
25、(TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes.This second edition cancels and replaces the first edition (ISO 7784-3:2000), which has be
26、en technically revised with the following changes:a) the title has been changed;b) the terms and definitions clause has been amended;c) a figure explaining the principle of the method was amended;d) the supplementary test conditions previously in Annex A have been integrated in the test report;e) th
27、e calibration of the apparatus previously in Annex B has been deleted;f) the test procedure has been re-arranged;g) the text has been editorially revised and the normative references have been updated.ISO 7784 consists of the following parts, under the general title Paints and varnishes Determinatio
28、n of resistance to abrasion: Part 1: Method with abrasive-paper covered wheels and rotating test specimen Part 2: Method with abrasive rubber wheels and rotating test specimen Part 3: Method with abrasive-paper covered wheel and linearly reciprocating test specimeniv ISO 2016 All rights reservedBS E
29、N ISO 7784-3:2016ISO 7784-3:2016(E)IntroductionThis part of ISO 7784 is one of the three parts of ISO 7784 dealing with test methods for the determination of the resistance to abrasion of coatings using abrasive wheels. The characteristics and differences of these methods are summarized in Table 1.T
30、able 1 Types of methodStandardAbrasive wheelTest specimen movementType Degree of freedomISO 7784-1Abrasive paper on rubber wheelFreely rotatable RotationISO 7784-2 Abrasive rubber wheelISO 7784-3Abrasive paper on metal wheelRigid with stroke-dependent rotationaLinear reciprocationaA mechanism rotate
31、s the abrasive wheel by a small angle after each double stroke so that a new area of the abrasive paper is effective.The methods using abrasive-paper covered wheels (ISO 7784-1 and ISO 7784-3) are preferably to be applied. ISO 2016 All rights reserved vBS EN ISO 7784-3:2016BS EN ISO 7784-3:2016Paint
32、s and varnishes Determination of resistance to abrasion Part 3: Method with abrasive-paper covered wheel and linearly reciprocating test specimen1 ScopeThis part of ISO 7784 specifies a method for determining the resistance to abrasion of coatings, for which a loaded, rigid abrasive-paper covered wh
33、eel affects the coating of the linearly reciprocating test specimen.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references,
34、 the latest edition of the referenced document (including any amendments) applies.ISO 1514, Paints and varnishes Standard panels for testingISO 2808, Paints and varnishes Determination of film thicknessISO 3270, Paints and varnishes and their raw materials Temperatures and humidities for conditionin
35、g and testingISO 4618, Paints and varnishes Terms and definitionsISO 7823-1, Plastics Poly(methyl methacrylate) sheets Types, dimensions and characteristics Part 1: Cast sheets3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 4618 and the following appl
36、y.3.1test specimenspecimen on which the test is to be carried out3.2double strokedsone complete reciprocal movement made by the abrasive wheel3.3repeatability conditionsconditions where independent test results are obtained with the same method on identical test items in the same laboratory by the s
37、ame operator using the same equipment within short intervals of timeSOURCE: ISO 5725-1:1994, 3.14INTERNATIONAL STANDARD ISO 7784-3:2016(E) ISO 2016 All rights reserved 1BS EN ISO 7784-3:2016ISO 7784-3:2016(E)3.4repeatability limitrvalue less than or equal to which the absolute difference between two
38、 test results obtained under repeatability conditions (3.3) may be expected to be with a probability of 95 %SOURCE: ISO 5725-1:1994, 3.163.5reproducibility conditionsconditions where test results are obtained with the same method on identical test items in different laboratories with different opera
39、tors using different equipmentSOURCE: ISO 5725-1:1994, 3.183.6reproducibility limitRvalue less than or equal to which the absolute difference between two test results obtained under reproducibility conditions (3.5) may be expected to be with a probability of 95 %SOURCE: ISO 5725-1:1994, 3.204 Princi
40、pleA rigid abrasive wheel, covered with abrasive paper, is pressed onto the coating applying the test load. The test specimen is reciprocated with specified stroke length and double-stroke frequency. The abrasive wheel itself is rotated by a small angle after each double stroke, so that a new fresh
41、portion of the abrasive paper is applied. The specimen is set with its testing surface facing downward, and the testing surface is abraded from underneath.Figure 1 illustrates the test principle.12345 6Key1 reciprocating motion2 specimen press3 abrasive paper4 abrasive wheel5 specimen6 specimen stag
42、eFigure 1 Principle of the abrasion test with linearly reciprocating test specimen2 ISO 2016 All rights reservedBS EN ISO 7784-3:2016ISO 7784-3:2016(E)5 Apparatus and materials5.1 Abrasive-wheel-wear test apparatus, consisting of a clamping device with pressure plate for holding the test specimen le
43、vel and rigid, and a 50 mm diameter wheel to the outer circumference of which is attached a 12 mm wide strip of the abrasive paper (5.2). The force between the wheel and the testing surface shall be capable of being varied from 0,98 N to at least 6,9 N with an accuracy of 0,05 N. The abrasive action
44、 is produced by the test specimen sliding to and fro in a horizontal plane in parallel contact with the testing surface over a 30 mm length over the abrasive wheel. Typical apparatus is illustrated in Figure 2.After each double stroke, the wheel is advanced through a small angle to bring a new fresh
45、 portion of the abrasive paper into contact with the testing surface before making the next double stroke (400 ds in maximum). The relative speed of movement shall be (40 2) ds per minute. The testing surface shall be kept free from loose powder or abrasion debris during the test.56782314Key1 specim
46、en stage 5 specimen reciprocating motor2 abrasive wheel 6 load3 specimen guide 7 load scale4 specimen press 8 load adjustFigure 2 Abrasive-wheel-wear test apparatus (example)5.2 Abrasive paper. The recommended abrasive paper is grain size P180 silicon carbide paper (ISO 6344-1). The strip shall be (
47、12,0 0,2) mm wide. Its length shall be such that it covers the abrasive wheel without overlap or gap at the ends, a strip length of 158 mm is sufficient. In case the strips of ISO 2016 All rights reserved 3BS EN ISO 7784-3:2016ISO 7784-3:2016(E)abrasive paper are cut at an angle (45) prior to adheri
48、ng (see Figure 3), a minimum length of 170 mm is required. The strip shall be attached to the wheel by double-sided adhesive tape or self-adhesive abrasive paper shall be used.Other types of abrasive paper may be used by agreement between the interested parties.5.3 Balance, with an accuracy of 0,1 m
49、g.6 Test specimens6.1 Preparation of test specimensThe test specimens shall be plane, have the minimum dimensions of 30 mm 50 mm, and be prepared, coated, and dried/hardened in accordance with ISO 1514.Typical dimensions for a test specimen are 50 mm 50 mm (1 mm to 5 mm).NOTE For a common apparatus, the maximum dimension of the test specimens of 100 mm 300 mm is allowable.6.2 Film thicknessDetermine the dry-film thickness of the coating, in micrometres, in accordance with one of the methods speci
