1、BSI Standards PublicationBS EN ISO 7784-2:2016Paints and varnishes Determination of resistance toabrasionPart 2: Method with abrasive rubber wheelsand rotating test specimenBS EN ISO 7784-2:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO7784-2:2016. It
2、supersedes BS EN ISO 7784-2:2006 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 publication does not purport to include
3、 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 79677 7ICS 87.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Sta
4、ndard 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 7784-2 April 2016 ICS 87.040 Supersedes EN ISO 7784-2:2006English
5、Version Paints and varnishes - Determination of resistance to abrasion - Part 2: Method with abrasive rubber wheels and rotating test specimen (ISO 7784-2:2016) Peintures et vernis - Dtermination de la rsistance labrasion - Partie 2: Mthode utilisant des roues abrasives en caoutchouc et une prouvett
6、e rotative (ISO 7784-2:2016) Beschichtungsstoffe - Bestimmung des Abriebwiderstandes - Teil 2: Verfahren mit Reibrdern aus Gummi und rotierender Probe (ISO 7784-2:2016)This European Standard was approved by CEN on 27 February 2016. CEN members are bound to comply with the CEN/CENELEC Internal Regula
7、tions 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
8、. 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
9、 members are the national standards bodies of 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, P
10、ortugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION 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
11、 form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 7784-2:2016 EBS EN ISO 7784-2:2016EN ISO 7784-2:2016 (E) 3 European foreword This document (EN ISO 7784-2:2016) has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes“ in collaboration with Technica
12、l 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 October 2016, and conflicting national standards shall be wit
13、hdrawn at the latest by October 2016. Attention is drawn to the possibility that some 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 7784-2:2006. Acc
14、ording 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, Former Yugoslav Republic of Macedonia, France, German
15、y, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 7784-2:2016 has been approved by CEN as EN ISO 7784-2:2
16、016 without any modification. BS EN ISO 7784-2:2016ISO 7784-2:2016(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 25 Apparatus and materials 26 Test specimens 46.1 Preparation of test specimens . 46.2 Film thickness 46.3 Conditioning 47 Procedure
17、. 47.1 Agreements 47.2 Preparation of the abrasive wheels . 47.3 Test conditions 57.4 Number of determinations . 57.5 Test procedure . 58 Evaluation 59 Precision . 510 Test report . 6Bibliography 7 ISO 2016 All rights reserved iiiContents PageBS EN ISO 7784-2:2016ISO 7784-2:2016(E)ForewordISO (the I
18、nternational 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
19、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 electrotechnica
20、l 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 was drafted in a
21、ccordance 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 such patent rights. Det
22、ails 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 does not constitute an
23、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 (TBT) see the following URL: Foreword - Supplementary informationThe committee re
24、sponsible 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 7784-2:1997), which has been technically revised with the following changes:a) the title has been changed;b
25、) the terms and definitions clause has been amended;c) the 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) the calibration of the apparatus previously in Annex B has been deleted;f) the te
26、st 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 Determination of resistance to abrasion: Part 1: Method with abrasive-paper covered wheels
27、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 EN ISO 7784-2:2016ISO 7784-2:2016(E)IntroductionThis part of ISO 7784 is one of
28、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.Table 1 Types of methodStandardAbrasive wheelTest specimen movementType Degree o
29、f 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 rotates the abrasive wheel by a small angle after each double stroke so that a new ar
30、ea 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 7784-2:2016BS EN ISO 7784-2:2016Paints and varnishes Determination of resistance to abrasion Part 2: Method with abr
31、asive rubber wheels and rotating test specimen1 ScopeThis part of ISO 7784 specifies a method for determining the resistance to abrasion of coatings, for which two loaded, freely rotatable but eccentrically arranged abrasive rubber wheels affect the coating of the rotating test specimen.2 Normative
32、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, the latest edition of the referenced document (including any amendments) applie
33、s.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 conditioning and testingISO 4618, Paints and varnishes Terms and definitionsISO 7619-1, Rub
34、ber, vulcanized or thermoplastic Determination of indentation hardness Part 1: Durometer method (Shore hardness)ISO 7619-2, Rubber, vulcanized or thermoplastic Determination of indentation hardness Part 2: IRHD pocket meter methodFEPA-Standard 43-1, Grains of fused aluminium oxide, silicon carbide a
35、nd other abrasive materials for coated abrasives Macrogrits P 12 to P 2201)3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 4618 and the following apply.3.1test specimenspecimen on which the test is to be carried out3.2abrasive wearwear, occurring due
36、to laminar removal of coating material on the surface1) FEPA: Federation of European Producers of Abrasives.INTERNATIONAL STANDARD ISO 7784-2:2016(E) ISO 2016 All rights reserved 1BS EN ISO 7784-2:2016ISO 7784-2:2016(E)4 PrincipleTwo agreed, pivot-mounted abrasive rubber wheels are pressed onto the
37、coating of the rotating test specimen applying the agreed test load. The eccentric arrangement of the axes of the abrasive wheels relative to the axis of rotation causes a crosswise abrasive wear in a ring-shaped zone. The loss of mass of the coating caused by abrasive wear after the agreed number o
38、f cycles is determined.Figure 1 illustrates the test principle.Key1 turntable2 test specimen3 wear zone4 abrasive wheelsFigure 1 Principle of the abrasion test with rotating test specimen5 Apparatus and materials5.1 Turntable abrasion tester, as exemplified in Figure 2, with the following properties
39、.5.1.1 The rotational speed of the turntable onto which the test specimen is fixed shall be (60 2) min1. The number of cycles is pre-set on an operation counter.5.1.2 Two arms are attached to the device, each with a mandrel, onto which the abrasive wheels (5.2) and, if necessary, the weights (5.3) a
40、re attached. Ball bearings are used for the mandrels for the abrasive wheels so they can rotate with low friction.5.1.3 It shall be ensured that in lowered condition, the positions of the abrasive wheels relative to the axis of rotation comply with the dimensions indicated in Figure 2.5.1.4 A suctio
41、n device shall be available in order to remove abrasive dust generated during the test.2 ISO 2016 All rights reservedBS EN ISO 7784-2:2016ISO 7784-2:2016(E)Dimensions in millimetresKey1 abrasive wheels2 turntable3 test specimen4 wear zone (about 10 mm wide)5 vacuum nozzles6 rotating direction7 axis
42、of rotation (turntable)8 axis of rotation (abrasive wheel)aOffset (19,0 0,5) mm.Figure 2 Schematic diagram of the turntable abrasion tester5.2 Abrasive wheel, consisting of a cylindrical rubber disc containing abrasive granulate and equipped with an axial bore hole for attachment on the supported ma
43、ndrel on the arm of the apparatus (see 5.1.2). The diameter of the abrasive wheel shall be (48,4 4,0) mm and the thickness shall be (12,7 0,2) mm.NOTE 1 The specification of the diameter is understood as the abrasive wheel having a maximum diameter of 52,4 mm in unused condition and that it may be u
44、sed until worn to a minimum diameter of 44,4 mm.The hardness of the elastomer material (in Shore A in accordance with ISO 7619-1 or in IRHD in accordance with ISO 7619-2), as well as the type, grain size (distribution), and amount of the abrasive filling material shall be agreed.NOTE 2 It is common
45、to agree on the abrasive wheel on the basis of the identification of the abrasive wheel manufacturer. ISO 2016 All rights reserved 3BS EN ISO 7784-2:2016ISO 7784-2:2016(E)Two abrasive wheels are required for the test.5.3 Weights, to increase the test load up to about 10 N by attaching to each arm (s
46、ee 5.1.2).NOTE For a common apparatus, the minimum test load, which is exerted solely by the abrasive wheel and the arms without additional weights, is 3,0 N and with the weights, the test load values 5,4 N and 10,3 N are additionally available for each abrasive wheel.5.4 Abrasive-paper disc, grain
47、size P 150 in accordance with FEPA-Standard 43-1, for dressing the abrasive wheels.5.5 Balance, with an accuracy of 0,1 mg.6 Test specimens6.1 Preparation of test specimensThe test specimens shall be plane, have the minimum dimensions of 100 mm 100 mm, and be prepared, coated, and dried/hardened in
48、accordance with ISO 1514.For the mentioned dimensions of the test specimen, the minimum distance between wear zone and edge of the test specimen shall be about 7 mm (see Figure 2).For a common apparatus, the test specimen is fixed on the turntable by means of an axial screw. For this, the test speci
49、men shall have a bore hole in the centre.6.2 Film thicknessDetermine the dry film thickness of the coating, in micrometres, in accordance with one of the methods specified in ISO 2808.6.3 ConditioningPrior to testing, condition the coated test specimens at a temperature of (23 2) C and a relative humidity of (50 5) % (in accordance with ISO 3270), if not agreed otherwise, for at least 16 h.7 Procedure7.1 AgreementsFor the test procedure, the following shall be agreed: the type of abrasive wheel in accor
