1、INTERNATIONALSTANDARDISO4630-2First edition2004-11-15Reference numberISO 4630-2:2004(E) ISO 2004Clear liquids Estimation of colour by the Gardner colour scale Part 2:Spectrophotometric methodLiquides clairs valuation de la couleur au moyen de lchelle Gardner Partie 2: Mthode spectrophotomtriqueCopyr
2、ight International Organization for Standardization Reproduced by IHS under license with ISO Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO 4630-2:2004(E)ii ISO 2004 All rights reservedPDF disclaimerThis PDF file may contain embedded typefaces. In accordance w
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7、2 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandCopyright International Organization for Standardization Reproduced by IHS under license with ISO Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO 4630-2:2004(E) ISO 20
8、04 All rights reserved iiiContents Page1 Scope 12 Normative references 13 Principle 14 Apparatus and materials . 15 Sampling . 26 Procedure . 27 Expression of results 28 Precision . 29 Test report 3Annex A (normative) Calculating Gardner colour from chromaticity coordinates 4Bibliography . 6Copyrigh
9、t International Organization for Standardization Reproduced by IHS under license with ISO Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO 4630-2:2004(E)iv ISO 2004 All rights reservedForewordISO (the International Organization for Standardization) is a worldwid
10、e federation 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 co
11、mmittee. International 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 accordan
12、ce with the 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 app
13、roval by at 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 4630-2 was prepared by Technical Committ
14、ee ISO/TC 35, Paints and varnishes, Subcommittee SC 10,Test methods for binders for paints and varnishes, in collaboration with ASTM D 01.34, Naval Stores. It hasbeen harmonized with ASTM D 6166-97, Standard Test Method for Color of Naval Stores and Related Products(Instrumental Determination of Gar
15、dner Color).ISO 4630 consists of the following parts, under the general title Clear liquids Estimation of colour by theGardner colour scale: Part 1: Visual method Part 2: Spectrophotometric methodCopyright International Organization for Standardization Reproduced by IHS under license with ISO Not fo
16、r ResaleNo reproduction or networking permitted without license from IHS-,-,-INTERNATIONAL STANDARD ISO 4630-2:2004(E) ISO 2004 All rights reserved 1Clear liquids Estimation of colour by the Gardner colour scale Part 2:Spectrophotometric method1ScopeThis part of ISO 4630 specifies a method for estim
17、ating, by means of the Gardner colour scale, the colour ofclear, yellow/brown liquid products using colour-measuring instruments. The results might be invalid if otherproducts are tested. The test uses the Gardner colour scale described in ISO 4630-1.The method is applicable to drying oils, varnishe
18、s and solutions of fatty acids, polymerized fatty acids, resins,tall oil, tall oil fatty acids, rosin and related products.The method described provides a more precise way of measuring Gardner colour than that described inISO 4630-1. It is applicable to products having colours from Gardner 1 to Gard
19、ner 18. The Gardner scale is notapplicable to products with colours lighter than 1 or darker than 18.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the lates
20、t edition of the referenced document(including any amendments) applies.ISO 4630-1, Clear liquids Estimation of colour by the Gardner colour scale Part 1: Visual methodISO 15528, Paints, varnishes and raw materials for paints and varnishes SamplingCIE Publication No. 15.2, Colorimetry3 PrincipleThe c
21、olour of a liquid sample is measured using an instrument capable of measuring transmitted colour andreporting in Gardner colours or in a colour system that can be converted into Gardner colours.4 Apparatus and materials4.1 Colour-measuring instrument, capable of measuring transmitted colour ( geomet
22、ry) andreporting the results in the Gardner colour scale described in ISO 4630-1. If such an instrument is not available,one may be used which is capable of measuring transmitted colour and reporting in tristimulus values orchromaticity coordinates using standard illuminant C and the observer, descr
23、ibed in CIE PublicationNo. 15.2.4.2 Glass absorption cells, path length, unless a different path length is specified by the instrumentmanufacturer.0/180210 mmCopyright International Organization for Standardization Reproduced by IHS under license with ISO Not for ResaleNo reproduction or networking
24、permitted without license from IHS-,-,-ISO 4630-2:2004(E)2 ISO 2004 All rights reservedOr4.3 Glass tubes, clear. Glass test tubes, as decribed in ISO 4630-1, or other glass tubes designed for aspecific instrument may be used. The test tubes might provide less accuracy than glass absorption cells and
25、should be used only when a decrease in accuracy is acceptable. Glass absorption cells should preferably beused for referee purposes.5 SamplingTake a representative sample of the product to be tested, as described in ISO 15528.6 ProcedureBaseline calibration of the instrument shall be performed follo
26、wing the instrument manufacturersrecommendations.If the material to be tested is cloudy, first filter it (see Note). Then, using the same type of glass tube orabsorption cell as used for the baseline calibration, fill the glass tube or absorption cell with the product. Takecare not to touch the meas
27、urement area of the glass tube or absorption cell.If the material shows any visual haziness, remove the haze by filtration, centrifugation, heating, ultrasonictreatment or any other suitable means. If the haziness cannot be removed, the measured value will beunreliable. Avoid creating air bubbles wh
28、en filling the glass tube or absorption cell. If air bubbles are formed andremain trapped, remove them by heating, vacuum, ultrasonic treatment or any other suitable means (see Note).NOTE Some sample pretreatments can change the colour.Insert the glass tube or absorption cell in the instrument and m
29、easure the Gardner colour, following theinstrument manufacturers recommended procedure.Regular checks as per the instrument manufacturers recommendations should be carried out. These willnormally be in the form of checks with certified reference materials.7 Expression of resultsReport the colour in
30、Gardner colour units to the nearest tenth of a Gardner unit as given by the instrument or ascalculated by the method given in Annex A.8Precision8.1 GeneralThe precision of the test method was determined by interlaboratory testing in accordance with ISO 5725-2.Three different materials were tested by
31、 13 laboratories.8.2 Repeatability limit ()The repeatability limit is the value below which the absolute difference between two single test results, eachthe mean of duplicates, obtained on identical material by one operator in one laboratory within a short intervalof time using the standardized test
32、 method can be expected to lie with a probability of .The repeatability for three repeated measurements, made in accordance with this part of ISO 4630 andexpressed as the repeatability limit , is 0,1 Gardner units.rr95 %rCopyright International Organization for Standardization Reproduced by IHS unde
33、r license with ISO Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO 4630-2:2004(E) ISO 2004 All rights reserved 3The repeatability standard deviation among test results, related to the above number by the factor 2,8, is0,02 Gardner units.8.3 Reproducibility limi
34、t ()The reproducibility limit is the value below which the absolute difference between two test results, each themean of duplicates, obtained on identical material by operators in different laboratories using the standardizedtest method can be expected to lie with a probability of .The reproducibili
35、ty for three repeated measurements, made in accordance with this part of ISO 4630 andexpressed as the reproducibility limit , is 0,5 Gardner units.The reproducibility standard deviation among test results, related to the above number by the factor 2,8, is0,18 Gardner units.8.4 BiasSince there is no
36、accepted reference material suitable for determining the bias of the procedure in this testmethod, bias has not been determined.9 Test reportThe test report shall contain at least the following information:a) a reference to this part of ISO 4630 (ISO 4630-2);b) all details necessary to identify the
37、product examined;c) whether any pretreatment of the product was necessary;d) the result of the test as indicated in Clause 7;e) any deviation from the test method specified;f) the date of the test.RR95 %RCopyright International Organization for Standardization Reproduced by IHS under license with IS
38、O Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO 4630-2:2004(E)4 ISO 2004 All rights reservedAnnex A(normative)Calculating Gardner colour from chromaticity coordinatesA.1 For instruments reporting in tristimulus values or chromaticity coordinates, measure the
39、tristimulusvalues or chromaticity coordinates using absorption cells or glass test tubes as specified in ISO 4630-1and using standard illuminant C and the observer. Cells or tubes with larger or smaller path lengths will givetristimulus values and chromaticity coordinates that will not convert, usin
40、g Table A.1, to the true Gardner colourof the test material.A.2 Record the tristimulus values , , or the chromaticity coordinates , for the test material.A.3 If the instrument reports tristimulus values, convert them to chromaticity coordinates using the procedurein CIE Publication No. 15.2.A.4 The
41、Gardner colour of the test material is determined as follows:(A.1)whereis the Gardner colour of the test material;is the integral part of the value of the Gardner colour of the test material;is the decimal part of the Gardner colour value.Table A.1 Chromaticity coordinates of Gardner colours (see IS
42、O 4630-1)Gardner colour standard numberChromaticity coordinatesLuminous transmittance, Tolerance on transmittance1 0,317 7 0,330 3 80 72 0,323 3 0,335 2 79 73 0,332 9 0,345 2 76 64 0,343 7 0,364 4 75 55 0,355 8 0,384 0 74 46 0,376 7 0,406 1 71 47 0,404 4 0,435 2 67 48 0,420 7 0,449 8 64 49 0,434 3 0
43、,464 0 61 410 0,450 3 0,476 0 57 411 0,484 2 0,481 8 45 412 0,507 7 0,463 8 36 513 0,539 2 0,445 8 30 614 0,564 6 0,427 0 22 615 0,585 7 0,408 9 16 216 0,604 7 0,392 1 11 117 0,629 0 0,370 1 6 118 0,647 7 0,352 1 4 110 mm2Yxy% () %XYZ xyGTM=GI+GFGTMGIGFCopyright International Organization for Standa
44、rdization Reproduced by IHS under license with ISO Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO 4630-2:2004(E) ISO 2004 All rights reserved 5A.5 By comparing the chromaticity coordinate of the test material with the chromaticity coordinates inTable A.1, dete
45、rmine the integral part of the Gardner colour of the test material using the following relationship:(A.2)whereis the Gardner colour which is immediately lighter than the test material;is the chromaticity coordinate for the Gardner colour which is immediately lighter than the testmaterial;is the chro
46、maticity coordinate of the test material;is the chromaticity coordinate for the Gardner colour which is immediately darker than the testmaterial.A.6 Calculate the decimal part of the Gardner colour of the test material as follows:(A.3)whereis the chromaticity coordinate for the Gardner colour which
47、is immediately lighter than the testmaterial;is the chromaticity coordinate of the test material;is the chromaticity coordinate for the Gardner colour which is immediately darker than the testmaterial;and are as defined for Equation (A.2).EXAMPLE A test material has chromaticity coordinates of , . I
48、n Table A.1, is between thechromaticity coordinates for Gardner colour values 5 and 6, thereforeand(A.4)ThusxxGI=Gnfor xnlessorequalslantxTMxn+1GnxnxxTMxxn+1xGF=(xn+1xn)(xTMxn) + (yn+1yn)(yTMyn)(xn+1xn)2+ (yn+1yn)2ynyyTMyyn+1yxn,xn+1xTMxTM= 0,368 5 yTM= 0,399 8 xTMGI= 5GF=(0,376 7 0,355 8)(0,368 5 0
49、,355 8) + (0,406 1 0,384 0)(0,399 8 0,384 0)(0,376 7 0,355 8)2+ (0,406 1 0,384 0)2= 0,7GTM= 5,7Copyright International Organization for Standardization Reproduced by IHS under license with ISO Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ISO 4630-2:2004(E)6 ISO 2004
