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 Part21: Comparison of heat stability of pigments using a stoving medium This Part should be read in conjuncti
2、on with the General Introduction to BS3483 issued separately. UDC 667.622:535.682BS3483-C8:1980 This British Standard, having been prepared under the directionof the Pigments, Paintsand Varnishes StandardsCommittee, was published under the authority ofthe Executive Board and comes into effect on 31J
3、uly1980 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 approval80/50492 ISBN 0 580 11532 1 National foreword This revision of Part C8 of BS3483 has been prepared under the direction o
4、f the Pigments, Paints and Varnishes Standards Committee. It is identical with ISO787-21 “General methods of test for pigments and extenders Part21:Comparison of heat stability of pigments using a stoving medium” published in1979 by the International Organization for Standardization (ISO). The1974 e
5、dition of Part C8 is now withdrawn.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 BritishStandard. Some terminology and certain conventions are not identical with those used in British Standards; attention i
6、s especially drawn to the following. In1.1 “This part of ISO787” should be read as “This Part of BS3483”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Sta
7、ndard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 and2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporat
8、ed. This will be indicated in the amendment table on the inside front cover. Cross-references International Standard Corresponding British Standard ISO842:1974 BS4726:1971 Methods for sampling raw materials for paints and varnishes (Technically equivalent) ISO3668:1976 BS3900 Methods of test for pai
9、nts Part D1:1978 Visual comparison of the colour of paints (Identical) Amendments issued since publication Amd. No. Date of issue CommentsBS3483-C8:1980 BSI 11-1999 i Content Page National foreword Inside front cover 0 Introduction 1 1 Scope and field of application 1 2 References 1 3 Apparatus and
10、materials 1 4 Sampling 1 5 Procedure 1 6 Test report 1 Publications referred to Inside back coverii blankBS3483-C8:1980 BSI 11-1999 1 0 Introduction This document is a part of ISO787, General methods of test for pigments and extenders. Although the method as written is intended for comparing the hea
11、t 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 pigment. 1 Scope and field of application This part of ISO787 specifies a general method of test for comparing the heat stability of the pigment und
12、er 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 the International Standard relating to that pigment, with a note of any detailed modification which may be needed in view of the special propert
13、ies 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 stability be specified. 2 References ISO842, Raw materials for paints and varnishes Sampling. ISO3668, Paints and varnishes Visual comparison of the
14、colour of paints. 3 Apparatus and materials 3.1 Panels Any suitable light-gauge metal panels, 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. 3.2 Agre
15、ed stoving medium 3.3 Oven, well ventilated and capable of being maintained at the agreed temperature. 4 Sampling Take a representative sample of the pigment to be tested as described in ISO842. 5 Procedure Prepare a dispersion of the pigment under test (alone or reduced to an agreed colour) in the
16、agreed storing medium by a suitable method to be agreed between the interested parties, including dilution of the dispersion to an appropriate consistency 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 d
17、ispersion of the pigment under test by an agreed method over the whole surface of a test panel, to give a wet film thickness of75 to1204m. Apply the dispersion of the agreed sample in the same manner to the whole surface of another panel. Allow the coated panels to remain at23 2 C and(50 5)% relativ
18、e humidity for30min and then cut each panel into a suitable number of strips, each not less than30mm wide, to carry out the required tests, labelling 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
19、are the standards against which other panels will be compared. Stove other strip(s) of the panels coated with the test sample and agreed sample 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
20、 described in ISO3668, compare in diffuse daylight the panels stoved at the higher temperature(s) of both the test sample and the agreed sample with the corresponding standard panels stoved at the minimum temperature. If daylight is not available, make the comparison in artificial daylight. If requi
21、red, the comparison shall be repeated after48h. Note the degree of colour change of the pigment under test as being less than, equal to, or 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,
22、 a suitable colorimeter may be used for measuring the colour differences, in which case ensure that the panel is sufficiently large to permit 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
23、of the pigment under test; b) a reference to this International Standard or to a corresponding national standard;BS3483-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
24、 curing conditions of the test 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
25、that of the agreed sample of pigment; g) the date of the test.BS3483-C8:1980 BSI 11-1999 Publications referred to See national foreword.BS 3483-C8: 1980 ISO 787-21: 1979 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for prepa
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