1、BSI Standards PublicationBS EN ISO 16925:2014Paints and varnishes Determination of the resistanceof coatings to pressure water-jettingBS EN ISO 16925:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO16925:2014.The UK participation in its preparation was e
2、ntrusted 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 all the necessaryprovisions of a contract. Users are responsible for its correctapplication. Th
3、e British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 75220 9ICS 87.040Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 28 Febr
4、uary 2014.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 16925 February 2014 ICS 87.040 English Version Paints and varnishes - Determination of the resistance of coatings to pressure water-jetting (ISO 16925:2014) Peintures et vernis - D
5、termination de la rsistance des revtements un jet deau sous pression (ISO 16925:2014)Beschichtungsstoffe - Prfung der Bestndigkeit von Beschichtungen gegen Druckwasserstrahl (ISO 16925:2014) This European Standard was approved by CEN on 20 December 2013. CEN members are bound to comply with the CEN/
6、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 Cent
7、re 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
8、 official versions. CEN 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, Netherl
9、ands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All right
10、s of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 16925:2014 EBS EN ISO 16925:2014EN ISO 16925:2014 (E) 3 Foreword This document (EN ISO 16925:2014) has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes” in collaboration wi
11、th 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 August 2014, and conflicting national standards sh
12、all be withdrawn at the latest by August 2014. 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. According to the CEN-CENELEC Internal R
13、egulations, 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, Germany, Greece, Hungary, Iceland, Ireland
14、, 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 16925:2014 has been approved by CEN as EN ISO 16925:2014 without any modification. BS EN IS
15、O 16925:2014ISO 16925:2014(E) ISO 2014 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 25 Apparatus and materials 26 Sampling 37 Preparation of test specimens 47.1 Test specimens 47.2 Preparation and coating 47.3 Thickness of c
16、oating . 48 Procedure. 48.1 Introducing the cut or the scribe . 48.2 Testing 59 Evaluation 69.1 General . 69.2 Evaluation with pictures to compare . 610 Precision . 610.1 General . 610.2 Repeatability limit (r) . 710.3 Reproducibility limit (R) . 711 Designation 712 Test report . 7Annex A (normative
17、) Calibration of the test apparatus .14Bibliography .17BS EN ISO 16925:2014ISO 16925:2014(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 o
18、ut 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 c
19、ollaborates 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 maintenance are described in the ISO/IEC Directives, Part 1. In particular the different app
20、roval criteria needed for the 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. www.iso.org/directivesAttention is drawn to the possibility that some of the elements of this document may be the subjec
21、t of patent rights. ISO 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. www.iso.org/patentsAny trade name us
22、ed in this document 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 Ba
23、rriers to Trade (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.iv ISO 2014 All rights reservedBS EN ISO 16925:2014INTERNATIONAL STANDARD
24、ISO 16925:2014(E)Paints and varnishes Determination of the resistance of coatings to pressure water-jetting1 ScopeThis International Standard specifies a test method for the assessment of the resistance of coatings to pressure water-jetting. The test method simulates the effects pressure water-jetti
25、ng has on a coating.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, the latest edition of the referenced document (
26、including any amendments) applies.ISO 1513, Paints and varnishes Examination and preparation of test samplesISO 2808, Paints and varnishes Determination of film thicknessISO 4618, Paints and varnishes Terms and definitionsISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampli
27、ngISO 17872, Paints and varnishes Guidelines for the introduction of scribe marks through coatings on metallic panels for corrosion testing3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 4618 and the following apply.3.1fracture strengthforce required
28、to exceed the attachment forces between coats or between coat and substrate (adhesion) and/or within a coat (cohesion)SOURCE: ISO 16276-1:2007, 3.13.2adhesionphenomenon of attachment at the interface between a solid surface and another material caused by molecular forcesNote 1 to entry: Adhesion sho
29、uld not be confused with cohesion.SOURCE: ISO 4618:2006, 2.63.3cohesionforces that bind a film into an integral entityNote 1 to entry: Cohesion should not be confused with adhesion.Note 2 to entry: Breaks in cohesion can occur within the coating as well as the substrate. In case of breaks within the
30、 substrate, it is subsumed under the term material delamination. ISO 2014 All rights reserved 1BS EN ISO 16925:2014ISO 16925:2014(E)SOURCE: ISO 4618:2006, 2.54, modified Note 2 to entry has been added.4 PrincipleThe resistance of a coated test specimen to the loss of adhesive strength is tested by m
31、eans of defined pressure water-jetting.The extent of the damage of the test specimen primarily depends on, besides the adhesive strength, the space between nozzle and test piece, the volumetric flow rate, the test time, the geometry of the nozzle, the impact area, the angle of impact, and the water
32、temperature of the jet, as well as the cutting and scribing tool.The evaluation is carried out by means of a visual comparison of pictures, in which characteristic values are related to the peeled-off areas.The parting line (plane) of the peeling shall be indicated in the test report (e.g. substrate
33、/priming coat).5 Apparatus and materialsOrdinary laboratory apparatus, together with the following:5.1 Pressure water-jet, consisting of a high-pressure pump and a nozzle.A high-pressure pump conveys the water from a storage bin. To avoid influences from variations in pressure, it is necessary that
34、the pressure and the volumetric flow rate be adjustable at the nozzle described below.The water temperature shall be adjustable to 2 C.The temperature shall be adjusted in accordance with Annex A. Necessary safety devices on the pressure side of the unit, as e.g. pressure relief valve and by-pass va
35、lve, shall exist. If the jetting is unsteady, a flow calming section may be installed in front of the nozzle. A pulsation of the water jet at the opening of the pump is inadmissible. In order to reach a reproducible result, the nozzle shall be solidly mechanically fixed and the test specimen shall b
36、e secured against slipping. For the adjustment of the volumetric flow rate, a nozzle with a jet angle of 25 and a volumetric flow rate of 6 l/min at 2 MPa (20 bar) is required (see Annex A).The following technical data should be attainable: volumetric flow rate: 8 l/min to 14 l/min pressure: 4 MPa (
37、40 bar) to 13 MPa (130 bar) temperature: 20 C to 80 C jetting time: 10 s to 300 sFigure 1 shows the schematic construction of a pressure water-jet apparatus which is specially built for these tests.2 ISO 2014 All rights reservedBS EN ISO 16925:2014ISO 16925:2014(E)Key1 flow calming section 8 heating
38、2 high-pressure valve, height adjustable 9 base frame, moveable3 test specimen 10 temperature sensor4 clamping element 11 high-pressure pump5 feed tank 12 by-pass valve6 floating valve with filter 13 pressure relief valve7 water shortage safeguard 14 pressure transmitterFigure 1 Schematic constructi
39、on of a pressure water-jet apparatus5.2 Cutting or scribing tool, to be agreed by the interested parties.The following cutting and scribing tools are appropriate: cutter knife (“C”), scribing tool according to van Laar (“L”) or scribing tool according to Sikkens (“S”), in accordance with ISO 17872.T
40、he tool should be safely usable.5.3 Time measuring device (stopwatch).6 SamplingTake a representative sample of the product being tested in accordance with ISO 15528.Examine and prepare each sample for testing in accordance with ISO 1513. ISO 2014 All rights reserved 3BS EN ISO 16925:2014ISO 16925:2
41、014(E)7 Preparation of test specimens7.1 Test specimensThe test specimens should preferably be plane. The size of the test specimens as well as the number of tests shall be agreed by the interested parties.Test specimens (building components) can have different adhesive strengths. It is recommended
42、that different parts of the test specimen (building components) be tested.7.2 Preparation and coatingThe conditions of coating, drying/hardening, as well as stoving, shall be agreed.Before testing, the coated test specimens shall be conditioned either 48 h at 60 C or 7 days at room temperature. In c
43、ase of conditioning at 60 C, the specimen shall be cooled down to room temperature before the cut or scribe (see 8.1) is introduced.7.3 Thickness of coatingDetermine the dry film thickness of the coating, in micrometres, in accordance with one of the procedures specified in ISO 2808.8 Procedure8.1 I
44、ntroducing the cut or the scribeMake sure that the test specimen is securely fastened when introducing the cut or the scribe.Introduce both of the cuts or scribes vertically through the coating into the substrate using the cutting or scribing tool, as shown in Figure 2. The depth of the cut or scrib
45、e into the substrate should be as minimal as possible. The length of the first cut or scribe shall be at least 100 mm, if the geometry of the part allows that. At an angle, introduce a second cut or scribe with a minimum length of 20 mm. The cuts or scribes shall be introduced straight-line at an an
46、gle of approximately 30. An automatic cutting or scribing device may be used. Residues of the coating shall be removed from the cut or scribe.NOTE The depth of the cut or scribe into the substrate influences the result.The cutting or scribing tools should be checked regularly and replaced if necessa
47、ry.4 ISO 2014 All rights reservedBS EN ISO 16925:2014ISO 16925:2014(E)Dimensions in millimetresFigure 2 Introducing the cuts or scribes (St Andrews cross)8.2 TestingAfter inserting the test specimen into the apparatus (e.g. using a spacer block), calibrate the space between test specimen and nozzle.
48、Operate the pressure water-jetting apparatus at room temperature.Three test methods (A, B, or C see Table 1) are preferred as well as three possible scribing tools (C, L, or S see 5.3). The test method to be applied, the scribing or cutting tool to be used, and the water pressure shall be agreed.Tab
49、le 1 Test methodsTest methodWater temperatureImpact angleSpace between nozzle and sampleFlow rateDuration of jettingC mm l/min sA 60 2 90 2 100 1 11,3 0,2 30 1B 60 2 90 2 100 1 11,3 0,2 60 1C 60 2 90 2 130 1 11,3 0,2 60 1For jetting, deionized water should be used.When using automatic and manual devices, fasten the test specimen so that the water jet impacts as shown in Figure 3. The jet impacts in the middle above the point of intersection onto the longer one of both cu
