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 ISO787-16:1995 has the status of a British StandardBSENISO787-16:1995 This British Standard, having been prepared under the directionof the Pigments, Paintsand Varnishes StandardsCommittee, was publish
3、ed under the authority ofthe Board of BSI and comes intoeffect on 29February1988 BSI 03-2000 First published March 1974 First revision February 1988 The following BSI references relate to the work on this standard: Committee reference PVC/1 Draft for comment 83/54194 DC ISBN 0 580 16395 4 Amendments
4、 issued since publication Amd. No. Date of issue Comments 8683 December 1995 Indicated by a sideline in the marginBSENISO787-16:1995 BSI 03-2000 i Contents Page National foreword ii Foreword 2 Text of EN ISO 787-16 3 Publications referred to Inside back coverBSENISO787-16:1995 ii BSI 03-2000 Nationa
5、l foreword This revision of PartA4 of BS3483 has been prepared under the direction of the Pigments, Paints and Varnishes Standards Committee. It is identical with ISO787-16:1986 “General methods of test for pigments and extenders Part 16: Determination of relative tinting strength (or equivalent col
6、ouring value) and colour on reduction of coloured pigments Visual comparison method” published by the International Organization for Standardization (ISO). This revision supersedes BS3483-A4:1974, which is withdrawn. In 1995 the European Committee for Standardization (CEN) accepted ISO787-16:1986 as
7、 European Standard EN ISO787-16:1995. As a consequence of implementing the European Standard this British Standard is renumbered as BS EN ISO787-16 and any reference to BS3483-A4 should be read as a reference to BS EN ISO787-16. BS 3483-A4 was first published in1974 and this first revision brings th
8、e 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-modified linseed oil. It has been assumed in t
9、he 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 as a British Standard without deviation. S
10、ome 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 the baseline as the decimal marker. Wherever
11、 the words “International Standard” appear, referring to this standard, they should be read as “British Standard”, “this part of ISO787” should be read as “this Part of BS3483”, and “ISO787-16” should be read as “BS3483-A4”. Cross-references International Standard Corresponding British Standard ISO
12、591:1977 BS 1851:1978 Specification for titanium dioxide pigments for paints (Identical) ISO 787-24:1985 a BS 3483 Methods for testing pigments for paints Part A6:1988 Determination of relative tinting strength of coloured pigments and relative scattering power of white pigments using a photometer (
13、Identical) ISO 842:1984 BS 4726:1986 Methods for sampling raw materials for paints and varnishes (Identical) ISO 1524:1983 BS 3900 Methods of test for paints Part C6:1983 Determination of fineness of grind (Identical) ISO 3219:1977 BS 2782 Methods of testing plastics Method 730B:1978 Determination o
14、f 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.BSENISO787-16:1995 BSI 03-2000 iii Additional information. In order to carry out some of the tests described in this standard it i
15、s necessary for a reference sample to be supplied or agreed by the parties concerned (see clause4). It is also necessary to agree supplementary information (see clause0) before commencing the comparison. A British Standard does not purport to include all the necessary provisions of a contract. Users
16、 of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. International Standard Corresponding British Standard ISO 3262:1975 BS 1795:1976 Specification for extenders for paints (Identical) ISO 3
17、668:1976 BS 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 Part 3:1987 Method for determination of acid value (titrimetric method) (Identical) ISO 4629:1978 Part 4:1987 Method for determination of hydroxyl v
18、alue (titrimetric method) (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, theEN ISOtitle page, 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.
19、This will be indicated in the amendment table on the inside front cover.iv blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 787-16 August 1995 ICS 87.060.10 Descriptors: Paints, pigments, extenders, tests, determination, colouring power, comparison analysis English version General metho
20、ds of test for pigments and extenders Part 16: Determination of relative tinting strength (orequivalent colouring value) and colour on reduction ofcoloured pigments Visual comparison method (ISO787-16:1986) Mthodes gnrales dessai des pigments et matires de charge Partie 16: Dtermination du pouvoir c
21、olorant relatif (ou valeur de coloration quivalente) et de la couleur dgrade des pigments colors Mthode de comparaison visuelle (ISO787-16:1986) Allgemeine Prfverfahren fr pigmente und Fllstoffe Teil 16: Bestimmung der relativen Farbstrke (oder des Frbequivalentes) und der Farbe in Weiaufhellung von
22、 Buntpigmenten Visuelles Angleichverfahren (ISO787-16:1986) This European Standard was approved by CEN on1995-03-23. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without an
23、y 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 versions (English, French, German). A version in any other language made by
24、 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Lux
25、embourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in
26、 any form and by any means reserved in all countries to CEN and its members Ref. No. EN ISO787-16:1995 EENISO787-16:1995 BSI 03-2000 2 Foreword The text of the International Standard from ISO/TC35, Paints and varnishes, of the International Organization for Standardization (ISO) has been taken over
27、as a European Standard by the Technical Committee CEN/TC298, Pigments and extenders. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February1996, and conflicting national standards shall be withd
28、rawn at the latest by February1996. According to CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Sw
29、itzerland and the UnitedKingdom. NOTENormative references to International publications are listed inAnnex ZA (normative). Contents Page Foreword 2 0 Introduction 3 1 Scope and field of application 3 2 References 3 3 Definitions 4 4 Principle 4 5 Materials 4 6 Apparatus 5 7 Sampling 5 8 Procedure 5
30、9 Expression of results 7 10 Test report 7 Annex ZA (normative) Normative references to international publications with their relevant European publications 8ENISO787-16:1995 BSI 03-2000 3 0 Introduction This document is a part of ISO787, General methods of test for pigments and extenders. This revi
31、sion of ISO787-16 has been carried out to align the presentation and procedures with those given in ISO787-24, 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 I
32、SO787 and ISO787-24. 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 a
33、t the level of maximum 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 in8.2 is used to estab
34、lish the conditions 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 in8.3 to8.5 is followed directly. The complete test procedure con
35、sists of four parts: 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 (see8.2); preparation of the dispersion of the coloured pigment (see8.3); mixing of the dispersions of coloured pigm
36、ent and white pigment (see8.4); comparison of the colour on reduction of the two mixtures, one from the test sample and the other from the agreed reference pigment (see8.5). The method described is intended as a referee method. It is realized that other binders and white pigments may be used for con
37、trol purposes 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
38、(inter)national 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 (see5.1). b) The volume (which should be about2ml) of the mix of pigment and binder. c) The ratio of pigment to binder.
39、d) The ratio 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 ISO787 describes a
40、 general method 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”. ISO787-24 describes a general method of test for determining the relative tinting
41、 strength 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
42、special properties 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 wh
43、ich it is 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 an
44、d its composition 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
45、 in the liquid, 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 valu
46、e Titrimetric method. ENISO787-16:1995 4 BSI 03-2000 ISO 4629, Paint media Determination of hydroxyl value Titrimetric method 1) . 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 colo
47、ured pigment in a binder with a white pigment paste 3.3 colour on reduction the colour of a pigment when it has been incorporated in a white pigment paste (3.2) 3.4 reduction ratio the proportion, by mass, of a coloured pigment to a white pigment in a reduction paste 4 Principle A dispersion of the
48、coloured test sample, prepared under defined conditions on an automatic muller, is mixed in a known ratio with a white pigment paste. The strength and undertone of the resulting reduction paste are compared with those of a similar paste made under the same conditions from the agreed reference pigmen
49、t and the same white pigment paste. 5 Materials 5.1 Binder The binder shall be agreed between the interested parties. The choice of binder should be made with regard to the field of application of the pigments being tested. For example, the following binders are suggested: NOTEThe proposed binders are available commercially. 5.1.1 Alkyd resin based on a mixture of63% (m/m) linseed oil and23% (m/m) phthalic anhydride, and complying with the following requirements: 5.1.2 Urethane-modified linseed oil, complying wi
