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1、BRITISH STANDARD BS EN ISO 787-16:1995 Incorporating Amendment No. 1 General methods of test for pigments and extenders Part 16: Determination of relative tinting strength (or equivalent colouring value) and colours on reduction of coloured pigments Visual comparison method This Part should be read
2、in conjunction with the General Introduction to BS 3483 issued separately The European Standard EN ISO 787-16:1995 has the status of a British Standard Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:56:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 787-16:1995 This British Standa
3、rd, having been prepared under the direction of the Pigments, Paints and Varnishes Standards Committee, was published under the authority of the Board of BSI and comes into effect on 29 February 1988 BSI 03-2000 First published March 1974 First revision February 1988 The following BSI references rel
4、ate to the work on this standard: Committee reference PVC/1 Draft for comment 83/54194 DC ISBN 0 580 16395 4 Amendments issued since publication Amd. No.Date of issueComments 8683December 1995 Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:56:50 GMT+0
5、0:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 787-16:1995 BSI 03-2000i Contents Page National forewordii Foreword2 Text of EN ISO 787-163 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:56:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 7
6、87-16:1995 ii BSI 03-2000 National foreword This revision of Part A4 of BS 3483 has been prepared under the direction of the Pigments, Paints and Varnishes Standards Committee. It is identical with ISO 787-16:1986 “General methods of test for pigments and extenders Part 16: Determination of relative
7、 tinting strength (or equivalent colouring value) and colour on reduction of coloured pigments Visual comparison method” published by the International Organization for Standardization (ISO). This revision supersedes BS 3483-A4:1974, which is withdrawn. In 1995 the European Committee for Standardiza
8、tion (CEN) accepted ISO 787-16:1986 as European Standard EN ISO 787-16:1995. As a consequence of implementing the European Standard this British Standard is renumbered as BS EN ISO 787-16 and any reference to BS 3483-A4 should be read as a reference to BS EN ISO 787-16. BS 3483-A4 was first publishe
9、d in 1974 and this first revision brings the standard into line with international agreements by implementing the ISO standard as an identical British Standard. The main change in this edition is that the determination is carried out using a binder based either on an alkyd resin or on a urethane-mod
10、ified linseed oil. It has been assumed in the drafting of this British Standard that the executions of its provisions will be entrusted to appropriately qualified and experienced people. Terminology and conventions. The text of the International Standard has been approved as suitable for publication
11、 as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on t
12、he baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”, “this part of ISO 787” should be read as “this Part of BS 3483”, and “ISO 787-16” should be read as “BS 3483-A4”. Cross-references Internation
13、al StandardCorresponding British Standard ISO 591:1977BS 1851:1978 Specification for titanium dioxide pigments for paints (Identical) ISO 787-24:1985aBS 3483 Methods for testing pigments for paints Part A6:1988 Determination of relative tinting strength of coloured pigments and relative scattering p
14、ower of white pigments using a photometer (Identical) ISO 842:1984BS 4726:1986 Methods for sampling raw materials for paints and varnishes (Identical) ISO 1524:1983BS 3900 Methods of test for paints Part C6:1983 Determination of fineness of grind (Identical) ISO 3219:1977BS 2782 Methods of testing p
15、lastics Method 730B:1978 Determination of the viscosity of polymers in the liquid, emulsified or dispersed state using a rotational viscometer working at a defined shear rate (Identical) a For information only. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:56:50 GMT+00:00 2006, Uncontrol
16、led Copy, (c) BSI BS EN ISO 787-16:1995 BSI 03-2000iii Additional information. In order to carry out some of the tests described in this standard it is necessary for a reference sample to be supplied or agreed by the parties concerned (see clause 4). It is also necessary to agree supplementary infor
17、mation (see clause 0) before commencing the comparison. 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 Standard does not of itself confer immunity from lega
18、l obligations. International StandardCorresponding British Standard ISO 3262:1975BS 1795:1976 Specification for extenders for paints (Identical) ISO 3668:1976BS 3900 Methods of test for paints Part D1:1978 Visual comparison of the colour of paints (Identical) BS 6782 Binders for paints ISO 3682:1983
19、Part 3:1987 Method for determination of acid value (titrimetric method) (Identical) ISO 4629:1978Part 4:1987 Method for determination of hydroxyl value (titrimetric method) (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, the EN ISO title page
20、, pages 2 to 8, 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. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:56:50 GMT+00:00 2006
21、, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:56:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 787-16 August 1995 ICS 87.060.10 Descriptors: Paints, pigments, extenders, tests, determination, c
22、olouring power, comparison analysis English version General methods of test for pigments and extenders Part 16: Determination of relative tinting strength (or equivalent colouring value) and colour on reduction of coloured pigments Visual comparison method (ISO 787-16:1986) Mthodes gnrales dessai de
23、s pigments et matires de charge Partie 16: Dtermination du pouvoir colorant relatif (ou valeur de coloration quivalente) et de la couleur dgrade des pigments colors Mthode de comparaison visuelle (ISO 787-16:1986) Allgemeine Prfverfahren fr pigmente und Fllstoffe Teil 16: Bestimmung der relativen Fa
24、rbstrke (oder des Frbequivalentes) und der Farbe in Weiaufhellung von Buntpigmenten Visuelles Angleichverfahren (ISO 787-16:1986) This European Standard was approved by CEN on 1995-03-23. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giv
25、ing this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official vers
26、ions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium,
27、Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart
28、36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members Ref. No. EN ISO 787-16:1995 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:56:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 787-16:1
29、995 BSI 03-2000 2 Foreword The text of the International Standard from ISO/TC 35, Paints and varnishes, of the International Organization for Standardization (ISO) has been taken over as a European Standard by the Technical Committee CEN/TC 298, Pigments and extenders. This European Standard shall b
30、e given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 1996, and conflicting national standards shall be withdrawn at the latest by February 1996. According to CEN/CENELEC Internal Regulations, the following countries are bo
31、und to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. NOTENormative references to International publications are listed in Annex ZA (
32、normative). Contents Page Foreword2 0Introduction3 1Scope and field of application3 2References3 3Definitions4 4Principle4 5Materials4 6Apparatus5 7Sampling5 8Procedure5 9Expression of results7 10Test report7 Annex ZA (normative) Normative references to international publications with their relevant
33、 European publications8 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:56:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 787-16:1995 BSI 03-20003 0 Introduction This document is a part of ISO 787, General methods of test for pigments and extenders. This revision of ISO 787-16 has be
34、en carried out to align the presentation and procedures with those given in ISO 787-24, which describes a photometric method for comparing relative tinting strength and colour on reduction of coloured pigments. The title has been amended to differentiate between this part of ISO 787 and ISO 787-24.
35、The degree of development of tinting strength of a coloured pigment is dependent on the amount of work done in the preparation of the dispersion, so that in determining the relative tinting strengths of two coloured pigments it is necessary for the comparison to be carried out at the level of maximu
36、m development. In this method, which uses an automatic muller, the development of tinting strength is influenced by the force applied, the number of revolutions, the binder, the volume of the mix, and the rheology of the mix. The preliminary test described in 8.2 is used to establish the conditions
37、under which a practical maximum of tinting strength may be obtained on the automatic muller. When these conditions are known for a particular pigment, the preliminary test is unnecessary and the procedure described in 8.3 to 8.5 is followed directly. The complete test procedure consists of four part
38、s: determination of the conditions for the preparation of the dispersion of the coloured pigment, and determination of the ratio of coloured pigment to white pigment (see 8.2); preparation of the dispersion of the coloured pigment (see 8.3); mixing of the dispersions of coloured pigment and white pi
39、gment (see 8.4); comparison of the colour on reduction of the two mixtures, one from the test sample and the other from the agreed reference pigment (see 8.5). The method described is intended as a referee method. It is realized that other binders and white pigments may be used for control purposes
40、in laboratories or by agreement between the interested parties. For any particular application, the method of test described in this International Standard needs to be completed by the following supplementary information. This information should be derived, in part or totally, from an (inter)nationa
41、l standard or other document related to the product under test or, if appropriate, should be agreed between the interested parties. a) The binder that should be used (see 5.1). b) The volume (which should be about 2 ml) of the mix of pigment and binder. c) The ratio of pigment to binder. d) The rati
42、o of coloured pigment to white pigment. e) The force (which should be the maximum available) that should be applied to the upper plate of the automatic muller. f) The number of revolutions of the automatic muller to be used. 1 Scope and field of application This part of ISO 787 describes a general m
43、ethod of test for comparing the tinting strength and colour on reduction of two similar coloured pigments, the results being expressed either as “relative tinting strength” or as “equivalent colouring value”. ISO 787-24 describes a general method of test for determining the relative tinting strength
44、 of coloured pigments using a photometric method. NOTE 1When 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, indicating any detailed modification which may be needed in view of the special p
45、roperties of the product in question. Only when this general method is not applicable to a particular material should a different method for determination of relative tinting strength and colour on reduction be specified. NOTE 2This method should not be used for those yellow pigments for which it is
46、 difficult to evaluate the tinting strength with the aid of a white pigment paste. In this case, it is common practice to use a blue pigment paste and to compare the strength and undertone of the resulting green pastes. The choice of the blue and white pigments for the blue pigment paste and its com
47、position should be the subject of an agreement between the interested parties. 2 References ISO 591, Titanium dioxide pigments for paints. ISO 842, Raw materials for paints and varnishes Sampling. ISO 1524, Paints and varnishes Determination of fineness of grind. ISO 3219, Plastics Polymers in the l
48、iquid, emulsified or dispersed state Determination of viscosity with a rotational viscometer at defined shear rate. ISO 3262, Extenders for paints. ISO 3668, Paints and varnishes Visual comparison of the colour of paints. ISO 3682, Binders for paints and varnishes Determination of acid value Titrime
49、tric method. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:56:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 787-16:1995 4 BSI 03-2000 ISO 4629, Paint media Determination of hydroxyl value Titrimetric method1). 3 Definitions 3.1 white pigment paste a dispersion of a white pigment in a binder 3.2 reduction paste; reduced paste a paste resulting from mixing a dispersion of a coloured pigment in a binder with a white pigment paste 3.3 colour on reduction the colour of a pigment when it has been
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