1、BRITISH STANDARDBS EN ISO 6504-3:2007 BS 3900-D11:2007Paints and varnishes Determination of hiding power Part 3: Determination of contrast ratio of light-coloured paints at a fixed spreading rateThe European Standard EN ISO 6504-3:2007 has the status of a British StandardICS 87.040g49g50g3g38g50g51g
2、60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 6504-3:2007This British Standard was published under the authority of the Standards Policy and Strategy Comm
3、ittee on 31 July 2007 BSI 2007ISBN 978 0 580 54391 3National forewordThis British Standard was published by BSI. It is the UK implementation of EN ISO 6504-3:2007. It is identical with ISO 6504-3:2006. It supersedes BS 3900-D11:1998 which is withdrawn.The UK participation in its preparation was entr
4、usted to Technical Committee STI/10, Test methods for paints.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Co
5、mpliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 6504-3February 2007ICS 87.040English VersionPaints and varnishes - Determination of hiding power - Part 3:Dete
6、rmination of contrast ratio of light-coloured paints at a fixedspreading rate (ISO 6504-3:2006)Peintures et vernis - Dtermination du pouvoir masquant -Partie 3: Dtermination du rapport de contraste despeintures claires un rendement surfacique dtermin(ISO 6504-3:2006)Beschichtungsstoffe - Bestimmung
7、des Deckvermgens -Teil 3: Bestimmung des Kontrastverhltnisses von hellenBeschichtungen bei einer festgelegten Ergiebigkeit (ISO6504-3:2006)This European Standard was approved by CEN on 21 January 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the condi
8、tions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three o
9、fficial versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria
10、, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE
11、FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 6504-3:2007: EForeword The text of ISO 650
12、4-3:2006 has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 6504-3:2007 by Technical Committee CEN/TC 139 “Paints and varnishes“, the secretariat of which is held by DIN. This Europea
13、n 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 2007, and conflicting national standards shall be withdrawn at the latest by August 2007. According to the CEN/CENELEC Internal Regulations, the national
14、 standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Pola
15、nd, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 6504-3:2006 has been approved by CEN as EN ISO 6504-3:2007 without any modifications. EN ISO 6504-3:2006INTERNATIONALSTANDARDISO6504-3Second edition2006-02-15Reference numberI
16、SO 6504-3:2006(E)Paints and varnishes Determination of hiding power Part 3:Determination of contrast ratio of light-coloured paints at a fixed spreading ratePeintures et vernis Dtermination du pouvoir masquant Partie 3: Dtermination du rapport de contraste des peintures claires un rendement surfaciq
17、ue dterminEN ISO 6504-3:2006iiiiiContents Page1 Scope 12 Normative references 13 Terms and definitions 14 Principle 25 Apparatus . 26 Sampling . 37 Procedure . 38 Precision . 69 Test report 7EN ISO 6504-3:2006ivForewordISO (the International Organization for Standardization) is a worldwide federatio
18、n of national standards bodies(ISO member bodies). The work of preparing International Standards is normally carried out through ISOtechnical committees. Each member body interested in a subject for which a technical committee has beenestablished has the right to be represented on that committee. In
19、ternational organizations, governmental andnon-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the InternationalElectrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the
20、 rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standardsadopted by the technical committees are circulated to the member bodies for voting. Publication as anInternational Standard requires approval by at
21、 least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patentrights. ISO shall not be held responsible for identifying any or all such patent rights.ISO 6504-3 was prepared by Technical Committee ISO/TC 3
22、5, Paints and varnishes, Subcommittee SC 9,General test methods for paints and varnishes.This second edition cancels and replaces the first edition (ISO 6504-3:1998), which has been technicallyrevised.The main technical changes are:a) the unit of density of the wet coating material, used in Equation
23、 (3) in 7.6.2, has been corrected;b) the surface density ( ) has been changed to mass per unit area of the dry coating ( ).The opportunity has also been taken to revise the text editorially.ISO 6504 consists of the following parts, under the general title Paints and varnishes Determination of hiding
24、power: Part 1: Kubelka-Munk method for white and light-coloured paints Part 3: Determination of contrast ratio of light-coloured paints at a fixed spreading rateThe subject originally intended to be covered by Part 2 is currently covered by ISO 2814, Paints andvarnishes Comparison of contrast ratio
25、(hiding power) of paints of the same type and colour.AmprimeprimeEN ISO 6504-3:2006vIntroductionTwo techniques are available for test film preparation and measurement when determining the contrast ratio ofpaints:a) application to colourless, transparent polyester foil, the coated foil being subseque
26、ntly placed in turn overblack and white glass panels;b) direct application to black and white charts, for example Morest charts.Because different operators using the same draw-down device will obtain paint films differing significantly inthickness, an absolute method for the determination of opacity
27、 is required. Collaborative trials between groupsof experts from a number of countries have shown that reproducible results can be obtained by determination ofthe contrast ratio corresponding to a precisely fixed spreading rate by interpolation between measurements attwo or more measured film thickn
28、esses. The spreading rate selected in this part of ISO 6504 is (wet filmthickness ), which is considered to be an average for brush application of a free-flowing paint on asmooth, non-porous surface. However, for particular types of paint normally used at other film thickness ranges,for example indu
29、strial enamels and printing inks, the interested parties may agree on another spreading rate.Further collaborative trials have indicated that higher reproducibility is obtained with films spread on polyesterfoil than with films spread on a black and white chart, although the latter technique is simp
30、ler to operate. Thispart of ISO 6504 provides for both these options.The methods are based on the observation that contrast ratio is an approximately linear function of reciprocalspreading rate, over a restricted film thickness range which also corresponds to that used for normal applicationof white
31、 or light-coloured paints. It is thus possible to interpolate graphically or by computation, with satisfactoryaccuracy, between results obtained with films of different thicknesses.Because the wet film thickness is not always determined directly, the methods specified in this part of ISO 6504involve
32、 the determination of dry film mass per unit area and calculation of the corresponding wet film thickness.In this latter calculation, values for wet paint density and percentage of non-volatile-matter content are required.Determination of these values by the methods specified in the relevant Interna
33、tional Standards has beenstipulated. However, it is recognized that, for certain types of paint, the non-volatile-matter determination inaccordance with ISO 3251 does not correspond exactly to the mass changes in a film during drying under theconditions of the present test method. Any errors introdu
34、ced into results by this discrepancy should be commonto all laboratories, however, and should not affect comparisons of paints of similar types.20 m2/l50mEN ISO 6504-3:2006blank1Paints and varnishes Determination of hiding power Part 3:Determination of contrast ratio of light-coloured paints at a fi
35、xed spreading rate1ScopeThis part of ISO 6504 describes methods for determining the opacity (by contrast ratio measurement) given bypaint films of white or light colours of tristimulus value greater than 25, applied at a spreading rate of to a black and white chart or to colourless transparent polye
36、ster foil. In the latter case, the tristimulus value ismeasured subsequently over black and white glass panels.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references,
37、 the latest edition of the referenced document(including any amendments) applies.ISO 1513, Paints and varnishes Examination and preparation of samples for testingISO 2811-1, Paints and varnishes Determination of density Part 1: Pyknometer methodISO 2811-2, Paints and varnishes Determination of densi
38、ty Part 2: Immersed body (plummet) methodISO 2811-3, Paints and varnishes Determination of density Part 3: Oscillation methodISO 2811-4, Paints and varnishes Determination of density Part 4: Pressure cup methodISO 3251, Paints, varnishes and plastics Determination of non-volatile-matter contentISO 4
39、618, Paints and varnishes Terms and definitionsISO 7724-2, Paints and varnishes Colorimetry Part 2: Colour measurementISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.
40、1 spreading ratesurface area that can be covered by a given quantity of coating material to give a dried film of requisite thicknessNOTE 1 It is expressed in or .NOTE 2 See also practical spreading rate and theoretical spreading rate.ISO 4618Y 20 m2/lYm2/l m2/kgEN ISO 6504-3:200623.2 practical sprea
41、ding ratespreading rate which, in practice, is obtained on the particular substrate being coatedISO 46183.3 theoretical spreading ratespreading rate calculated solely from the volume of non-volatile matterISO 46184PrincipleFor method A, coated transparent polyester foils are fixed over a black and w
42、hite glass panel. The tristimulusvalues of the coated foils are measured over the black and the white areas. The contrast ratio is calculated as apercentage for each coated foil.For method B, black and white charts are coated. The tristimulus values of each coated chart are measuredover the black an
43、d the white areas. The contrast ratio is calculated as a percentage for each coated chart.5 ApparatusOrdinary laboratory apparatus and glassware, together with the following:5.1 Substrate, conforming to the requirements of 5.1.1 or 5.1.2.5.1.1 Colourless transparent polyester foil (method A), untrea
44、ted, between and in thicknessand of dimensions not less than .NOTE Thicker foils may be used by agreement between the interested parties.5.1.2 Black and white charts (method B), all the same size and measuring at least ,printed and varnished to give adjacent black and white areas readily wetted by,
45、but impervious to, solvent- orwater-thinned paints.The black and white areas shall have dimensions not less than . The tristimulus value of thewhite areas of the charts shall be when measured over a white area using a reflectometer orspectrometer complying with 5.3, and that of the black area shall
46、not be greater than 5, unless otherwiseagreed.To avoid errors due to variation from one batch of charts to another, the charts used for the test shall come fromthe same batch.5.2 Film applicators, comprising a series of film applicators giving a range of uniform films of wet thicknessesusually rangi
47、ng from to . The film laid down shall be at least wide, with an area of uniformthickness measuring not less than , regardless of the substrate used.NOTE The application of uniform films is facilitated by the use of automatic applicators, which are recommended.5.3 Reflectometer or spectrophotometer,
48、to measure the tristimulus value , preferably for D65 standardilluminant, with an accuracy of .It is recognized that the relative geometrical arrangement of the illumination beam and the light detector canaffect the measurement of , but it is considered that variations arising from this factor in co
49、mmercialreflectometers should be considerably less than the reproducibility figure stated in Clause 8. In the event ofdispute, diffuse/8 geometry, including surface reflection, shall be used. Surface reflection shall be taken intoaccount by reducing the measured tristimulus value mathematically by 4 (see also ISO 7724-2).30m 50m100 mm 150 mm100 mm 200 mm80 mm 80 mm Y80 250m 100m 70 mm60 mm 60 mmY0,3 %YYEN ISO 6504-3:200635.4 Test panels, comprising black and white glass panels, at least thick, eac
