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1、BRITISH STANDARD BS 3483-C8: 1980 ISO 787-21: 1979 Methods for Testing pigments for paints Part C8: Comparison of heat stability ISO title: General methods of test for pigments and extenders Part 21: Comparison of heat stability of pigments using a stoving medium This Part should be read in conjunct
2、ion with the General Introduction to BS 3483 issued separately. UDC 667.622:535.682 Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:27:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3483-C8:1980 This British Standard, having been prepared under the direction of the Pigments, Paints and V
3、arnishes Standards Committee, was published under the authority of the Executive Board and comes into effect on 31 July 1980 BSI 11-1999 First published March 1974 First revision July 1980 The following BSI references relate to the work on this standard: Committee reference PVC/1 Draft for approval
4、80/50492 ISBN 0 580 11532 1 National foreword This revision of Part C8 of BS 3483 has been prepared under the direction of the Pigments, Paints and Varnishes Standards Committee. It is identical with ISO 787-21 “General methods of test for pigments and extenders Part 21: Comparison of heat stability
5、 of pigments using a stoving medium” published in 1979 by the International Organization for Standardization (ISO). The 1974 edition of Part C8 is now withdrawn. Terminology and conventions. The text of the International Standard has been approved as suitable for publication, without deviation, as a
6、 British Standard. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following. In 1.1 “This part of ISO 787” should be read as “This Part of BS 3483”. A British Standard does not purport to include all the necessary
7、 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 cover, pages i and ii, pages 1 an
8、d 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 StandardCorresponding British Standard ISO 842:1974BS 4726
9、:1971 Methods for sampling raw materials for paints and varnishes (Technically equivalent) ISO 3668:1976BS 3900 Methods of test for paints Part D1:1978 Visual comparison of the colour of paints (Identical) Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun s
10、heffieldun, na, Wed Nov 29 08:27:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3483-C8:1980 BSI 11-1999i Content Page National forewordInside front cover 0Introduction1 1Scope and field of application1 2References1 3Apparatus and materials1 4Sampling1 5Procedure1 6Test report1 Publications referr
11、ed toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:27:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:27:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3483-C8:1980 BSI 11-19991 0 Introduction This docum
12、ent is a part of ISO 787, General methods of test for pigments and extenders. Although the method as written is intended for comparing the heat stability of pigments by specifying the temperatures of heating and the time of heating, it may also be used for determining the heat resistance of a pigmen
13、t. 1 Scope and field of application This part of ISO 787 specifies a general method of test for comparing the heat stability of the pigment under test against that of an agreed sample. NOTEWhen this general method is applicable to a given pigment, only a cross-reference to it should be included in t
14、he 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 pigment should a special method for comparison of heat stabil
15、ity 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 Apparatus and materials 3.1 Panels Any suitable light-gauge metal panels, for example of bright tinplate or aluminium, conveniently 150
16、 mm 100 mm, the surfaces of which have been cleaned and lightly abraded, or other suitable panels as agreed between the interested parties. 3.2 Agreed stoving medium 3.3 Oven, well ventilated and capable of being maintained at the agreed temperature. 4 Sampling Take a representative sample of the pi
17、gment to be tested as described in ISO 842. 5 Procedure Prepare a dispersion of the pigment under test (alone or reduced to an agreed colour) in the agreed storing medium by a suitable method to be agreed between the interested parties, including dilution of the dispersion to an appropriate consiste
18、ncy by further addition of 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 the whole surface of a test panel, to give a wet film thickness of 75 to 120 4m. Apply the
19、 dispersion of the agreed sample in the same manner to the whole surface of another panel. Allow the coated panels to remain at 23 2 C and (50 5) % relative humidity for 30 min and then cut each panel into a suitable number of strips, each not less than 30 mm wide, to carry out the required tests, l
20、abelling each strip. Stove one strip of each panel for an adequate period at the lowest temperature that will ensure full curing of the film. NOTEThese panels are the standards against which other panels will be compared. Stove other strip(s) of the panels coated with the test sample and agreed samp
21、le respectively at the temperature(s) and for the time(s) agreed between the interested parties. Allow the panels to cool to room temperature. By the procedure described in ISO 3668, compare in diffuse daylight the panels stoved at the higher temperature(s) of both the test sample and the agreed sam
22、ple with the corresponding standard panels stoved at the minimum temperature. If daylight is not available, make the comparison in artificial daylight. If required, the comparison shall be repeated after 48 h. Note the degree of colour change of the pigment under test as being less than, equal to, o
23、r greater than the colour change of the agreed sample, stating for how long and at what temperature the particular panels were stoved. NOTEIf required and agreed, a suitable colorimeter may be used for measuring the colour differences, in which case ensure that the panel is sufficiently large to per
24、mit the cutting of strips which are not distorted. 6 Test report The test report shall include at least the following information: a) the type and identification of the pigment under test; b) a reference to this International Standard or to a corresponding national standard; Licensed Copy: sheffield
25、un sheffieldun, na, Wed Nov 29 08:27:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3483-C8:1980 2 BSI 11-1999 c) the details of items agreed between the interested parties, including pigment concentration, reference pigment used, medium used, method of application and curing conditions of the tes
26、t films; d) any deviation, 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: heat stability (characterized by colour change) less than, equal to, or greater than that of the agreed sample of
27、pigment; g) the date of the test. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:27:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3483-C8:1980 BSI 11-1999 Publications referred to See national foreword. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 08:27:31 GMT+00:00 2006, Unc
28、ontrolled Copy, (c) BSI BS 3483-C8: 1980 ISO 787-21: 1979 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is
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