1、BRITISH STANDARD BS 3483-C7: 1980 ISO 787-22: 1980 Methods for Testing pigments for paints Part C7: Comparison of resistance to bleeding ISO title: General methods of test for pigments and extenders Part22: Comparison of resistance to bleeding of pigments This Part should be read in conjunction with
2、 the General Introduction to BS3483 issued separately. UDC 667.622:667.613.752BS3483-C7:1980 This British Standard, having been prepared under the directionof the Pigments, Paintsand Varnishes StandardsCommittee, waspublished under the authorityof the Executive Boardand comes into effect on 31 July1
3、980 BSI 11-1999 First published March1974 First revision July1980 The following BSI references relate to the work on this standard: Committee reference PVC/1 Draft for approval80/50491 ISBN 0 580 11540 0 National foreword This revision of Part C7 of BS3483 has been prepared under the direction of th
4、e Pigments, Paints and Varnishes Standards Committee. It is identical with ISO787-22 “General methods of test for pigments and extenders Part22:Comparison of resistance to bleeding of pigments” published in1980 by the International Organization for Standardization (ISO). The1974 edition of Part C7 i
5、s now withdrawn. Terminology and conventions. The text of the International Standard has been approved as suitable for publication, without deviation, as a BritishStandard. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn
6、to the following. In1.1 “This part of ISO787” should be read as “This Part of BS3483”. In clause7 b) “International Standard (ISO787-22)” should be read as “BritishStandard (BS3483-C7)”. NOTETextual error. In clause0 “Indroduction” should be read as “Introduction”. A British Standard does not purpor
7、t to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cov
8、er, pagesi andii, pages1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Cross-references International Standard Corresponding British
9、Standard ISO842:1974 BS4726:1971 Methods for sampling raw materials for paints and varnishes (Technically equivalent) ISO3668:1976 BS3900 Methods of test for paints Part D1:1978 Visual comparison of the colour of paints (Identical) Amendments issued since publication Amd. No. Date of issue CommentsB
10、S3483-C7:1980 BSI 11-1999 i Contents Page National foreword Inside front cover 0 Indroduction 1 1 Scope and field of application 1 2 References 1 3 Definition 1 4 Materials 1 5 Sampling 1 6 Procedure 1 7 Test report 2 Publications referred to Inside back coverii blankBS3483-C7:1980 BSI 11-1999 1 0 I
11、ndroduction This document is a part of ISO787, General methods of test for pigments and extenders. Although a number of methods for determining resistance to bleeding are available, for example solubility in a solvent, the method in this part has been established because it is essentially a practica
12、l test and as such is probably of greater general value than other methods. 1 Scope and field of application This part of ISO787 specifies a general method for comparing the resistance to bleeding of a pigment with that of an agreed sample. NOTEWhen this general method is applicable to a given pigme
13、nt, only a cross-reference to it should be included in the International Standard relating to that pigment with a note of any detailed modification which may be needed in view of the special properties of the pigment in question. Only when this general method is not applicable to a particular pigmen
14、t should a special method for comparison of resistance to bleeding be specified. 2 References ISO 842, Raw materials for paints and varnishes Sampling. ISO 3668, Paints and varnishes Visual comparison of the colour of paints. 3 Definition bleeding the discoloration or staining of a newly applied pai
15、nt film due to migration of colour from the pigment contained in the coating over which the paint film is applied. The discoloration may occur immediately on application of the paint film or at any stage during the drying of the paint film 4 Materials 4.1 Panels Any suitable light-gauge metal panels
16、, for example of bright tinplate or aluminium, conveniently150mm 100mm, the surfaces of which have been cleaned and lightly abraded, or other suitable panels as agreed between the interested parties. 4.2 Silicon carbide paper, grade600. 4.3 Black and white charts, as used for hiding-power determinat
17、ions. 4.4 Agreed medium, which may be suitable either for drying at ambient temperature or for stoving for a specified time at a specified temperature, as agreed between the interested parties. 4.5 White overcoating composition, to be agreed between the interested parties. 5 Sampling Take a represen
18、tative sample of the pigment to be tested as described in ISO842. 6 Procedure Prepare a dispersion of the pigment under test in the agreed medium by a suitable method to be agreed between the interested parties, including dilution of the dispersion to an appropriate consistency by further addition o
19、f the agreed medium or solvent. Prepare a dispersion of the agreed sample in the same manner in the same medium. Apply the dispersion of the pigment under test by an agreed method over two-thirds of the length of a test panel, to give a wet film thickness of75 to1204m, and so that one end of the pan
20、el is left uncoated. Allow the film to dry as specified or subject it to the specified stoving conditions as appropriate. Prepare a test panel using the dispersion of the agreed sample in the same manner. If previously agreed between the interested parties, the coated area of the panel may be lightl
21、y abraded with the silicon carbide paper before the next stage of application. To a part of the uncoated area attach a piece of black and white chart. Apply the white overcoating composition over two-thirds of the length of the panel so as to leave one end coated only with the dispersion of the pigm
22、ent under test, the centre one-third coated with both pigment dispersion and overcoating, and the other end and the black and white chart with only the overcoating. The overcoating shall be applied thickly enough to cover the black and white pattern of the chart. Allow the film to dry at ambient tem
23、perature or subject it to the specified stoving conditions as appropriate. Immediately after the overcoating film is dry, compare, in diffuse daylight, by the procedure described in ISO3668, the degree of bleeding, as shown by the difference in colour between the areas of the panels coated with whit
24、e composition only and with the white composition over the pigment dispersion of the test sample, with the degree of bleeding of the agreed sample, and note whether it is equal to, greater than, or less than that of the agreed sample. If daylight is not available, make the comparison in artificial d
25、aylight. Repeat the comparison after24h. NOTEIf required and agreed, the degree of bleeding may be assessed by using a suitable colorimeter.BS3483-C7:1980 2 BSI 11-1999 7 Test report The test report shall include at least the following information: a) the type and identification of the pigment under
26、 test; b) a reference to this International Standard (ISO787-22); c) the details of items agreed between the interested parties, including pigment concentration, reference pigment used, medium used, method of application, curing conditions of the test film and type of overcoating; d) any deviation,
27、by agreement or otherwise, from the test procedure specified; e) whether the comparison was made in natural or artificial daylight; f) the result of the test: bleeding less than, equal to, or greater than that of the agreed sample of pigment; g) the date of the test.BS3483-C7:1980 BSI 11-1999 Public
28、ations referred to See national foreword.BS3483-C7: 1980 ISO787-22: 1980 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international le
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