1、BRITISH STANDARD BS 3483-A1: 1983 ISO 787-1: 1982 Methods for Testing pigments for paints Part A1: Comparison of colour ISO title: General methods of test for pigments and extenders Part1: Comparison of colour of pigments This Part should be read in conjunction with the General Introduction to BS348
2、3, issued separately. UDC 667.622:620.1:535.65BS3483-A1:1983 This BritishStandard, having been prepared under the directionof the Pigments, Paintsand Varnishes StandardsCommittee, waspublished under the authorityof the Board of BSIandcomes into effect on 30December1983 BSI 12-1999 First published Ma
3、y1962 First revision1968 Second revision March1974 Third revision December1983 The following BSI references relate to the work on this standard: Committee reference PVC/1 Draft for comment78/51273 DC ISBN 0 580 13640 X Committees responsible for this BritishStandard The preparation of this BritishSt
4、andard was entrusted by the Pigments, Paints and Varnishes Standards Committee (PVC/-) to Technical Committee PVC/1 upon which the following bodies were represented: Aluminium Federation Aluminium Powder and Paste Association British Colour Makers Association British Precast Concrete Federation Ltd
5、Cement Makers Federation Chemical Industries Association Oil and Colour Chemists Association Paintmakers Association of Great Britain Ltd Titanium Pigment Manufacturers Technical Committee White Lead Manufacturers Association The following body was also represented in the drafting of the standard, t
6、hrough subcommittees and panels: Department of Industry (Laboratory of the Government Chemist) Amendments issued since publication Amd. No. Date of issue CommentsBS3483-A1:1983 BSI 12-1999 i Contents Page Committees responsible Inside front cover National foreword ii 0 Introduction 1 1 Scope and fie
7、ld of application 1 2 References 1 3 Binder 1 4 Apparatus 1 5 Sampling 1 6 Procedure 1 7 Test report 2 National appendix 3 Publications referred to Inside back coverBS3483-A1:1983 ii BSI 12-1999 National foreword This revision of Part A1 of BS3483 has been prepared under the direction of the Pigment
8、s, Paints and Varnishes Standards Committee. It is identical with ISO787-1 “General methods of test for pigments and extenders Part1: Comparison of colour of pigments” published in1982 by the International Organization for Standardization (ISO). This Part of BS3483 supersedes BS3483-A1:1974 which is
9、 withdrawn. This revision was prepared principally to include the use of the test method for comparison of colour described in BS3900 “Methods of test for paints” PartD1:1978 “Visual comparison of the colour of paints”. It also allows the choice of binder, used in preparing the pigment dispersion, t
10、o be optional. In addition, the dispersion itself may be achieved by using either a manual procedure or a procedure using an automatic muller. It has been assumed in the drafting of this standard that it will be used and applied by those who are appropriately qualified and experienced and for whose
11、guidance it has been prepared. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a BritishStandard without deviation. Some terminology and certain conventions are not identical with those used in BritishStandards; attention is drawn
12、especially to the following. The comma has been used as a decimal marker. In BritishStandards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “BritishStandard”; wh
13、erever the identification “ISO787-1” and words “a part of ISO787” appear, they should be read as “this Part of BS3483” and “a Part of BS3483” respectively. The Technical Committee has reviewed the provisions of ISO150, to which reference is made in the text, and has decided that they are acceptable
14、for use in conjunction with this standard. A related BritishStandard for ISO150:1980 is BS242:1968, BS243:1968, BS259:1968, BS632:1968 “Linseed oil”. Other Parts of BS3483 are listed in the National appendix together with their relationship with ISO787. Additional information. In order to carry out
15、the method of test described in this standard, it is necessary for a reference sample to be supplied or agreed (see6.1.2). In addition information should be given concerning the binder (seeclause3) to be used to disperse the pigment. Cross-references International Standard Corresponding BritishStand
16、ard 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)BS3483-A1:1983 BSI 12-1999 iii A British Standard does not purport to incl
17、ude 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 cover, pages
18、i toiv, pages1to4, 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.iv blankBS3483-A1:1983 BSI 12-1999 1 0 Introduction This document is a part
19、of ISO787, General methods of test for pigments and extenders. ISO/R787-1 was published in July1968. This revision differs from the1968 edition in that a) the colour comparison is carried out using the procedure described in ISO3668, and b) the binder is not specified. 1 Scope and field of applicati
20、on 1.1 This part of ISO787 specifies a general method of test for comparing the colour of a coloured pigment with that of an agreed sample. 1.2 Either of the procedures described in clause6 is acceptable but the method using an automatic muller is the reference method. NOTEWhen this general method i
21、s 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 modifications which may be needed in view of the special properties of the material in question. Only when the procedures given in this
22、 general method are not applicable to a particular material should a special method for comparison of colour be specified. 2 References ISO150, Raw, refined and boiled linseed oil for paints and varnishes Specifications and methods of test. ISO842, Raw materials for paints and varnishes Sampling. IS
23、O3668, Paints and varnishes Visual comparison of the colour of paints. 3 Binder 1) The binder used shall be agreed between the interested parties. If no binder is specified or agreed, linseed oil, complying with the requirements of the refined grade specified in ISO150, should be used. 4 Apparatus O
24、rdinary laboratory apparatus, and 4.1 Palette knife, with a tapered steel blade of approximate dimensions140 to150mm long,20 to25mm wide at its widest point and not less than12,5mm wide at its narrowest point, or a palette knife of suitable plastics material. 4.2 Substrate, minimum area150mm 50mm. C
25、hoose a substrate according to the binder used and the method of colour comparison. If a glass panel is used, it shall be clear and colourless. 4.3 Burette, with a delivery such that1ml of the binder contains about35drops. 4.4 Muller Either of the following may be used: 4.4.1 Automatic muller, with
26、ground glass plates, preferably water cooled, of diameter180 to250mm, to which a variable but known force of up to about1kN may be applied. The driven glass plate shall have a rotational frequency of between70 and120r/min and the apparatus should have an arrangement for pre-setting the number of rev
27、olutions in multiples of25. NOTEIf the automatic muller does not have water-cooled plates, care should be taken that temperature variations do not occur during the grinding operation. 4.4.2 Hand muller, with a diameter of70 to75mm. 4.5 Plate, of ground glass or marble, for use when the automatic mul
28、ler(4.4.1) is not available. 5 Sampling Take a representative sample of the pigment to be tested as described in ISO842. 6 Procedure 6.1 Procedure using an automatic muller 6.1.1 Test portion Take a quantity of pigment for the test such that, when mixed with a sufficient quantity of the binder to ob
29、tain the dispersion, the resulting paste extends almost to the edges of the plates of the muller. Weigh the test portion to the nearest1mg. 6.1.2 Preparation of pigment dispersion Transfer the test portion(6.1.1) to the clean lower plate of the automatic muller(4.4.1). Run a number of drops of the b
30、inder (clause3) from the burette(4.3) on to the blade of the palette knife(4.1) and, using the blade, mix the binder and pigment. Add more drops of binder as necessary to produce a paste with a suitable consistency for milling. When the pigment has become uniformly wetted, spread the paste in a band
31、 approximately50mm wide about half-way between the centre and rim of the lower plate and clean the palette knife by drawing it across the upper plate. Close the muller plates, apply a force of about1kN and grind the paste in stages of50 revolutions for each stage, picking up the paste with the palet
32、te knife and returning it to the50mm wide band after each stage. NOTEThe applied force and the number of stages depend on the pigment tested, and should be the same for the pigment under test and the agreed sample. 1) See the paragraph headed “Additional information” in the national foreword.BS3483-
33、A1:1983 2 BSI 12-1999 When the grinding has been completed, add a further few drops of the binder to obtain a suitable consistency, close the muller plates and grind the paste for a further25 revolutions. Remove the paste from the plate and store it. 2) Take a similar amount of the agreed sample of
34、pigment and prepare a paste in the same way at a consistency equivalent to that used in treating the test portion, even if more or less binder may be required to achieve this consistency. 6.1.3 Colour comparison Compare the colour of the test portion with that of the agreed sample by spreading the t
35、wo prepared pastes in the same direction on the substrate(4.2) in opaque strips not less than25mm wide with touching edges not less than40mm long. Compare the colour by examining the strips in diffuse daylight on the surface or, by agreement between the interested parties, through the glass, immedia
36、tely after application, using the procedure described in ISO3668. Where good daylight is not available, make the comparison in artificial daylight, using the procedure described in ISO3668. NOTEBy agreement between the interested parties, a suitable colorimeter may also be used for making the compar
37、ison. 6.2 Procedure using a hand muller or palette knife 6.2.1 Test portion Weigh, to the nearest1mg, between0,1 and1,0g, depending on the oil absorption value of the pigment under test. 6.2.2 Preparation of pigment dispersion Transfer the test portion(6.2.1) to the glass or marble plate(4.5). Run a
38、 number of drops of the binder (clause3) from the burette(4.3) on to the blade of the palette knife(4.1) and, using the blade, mix the binder and pigment. Add more drops of binder as necessary to produce a paste with a suitable consistency for milling. When the pigment has become uniformly wetted wi
39、th binder, start rubbing with the palette knife(4.1) or hand muller(4.4.2) using a backwards and forwards motion. The rubbing should spread the mixture over an area approximately200mm 75mm. After100rubs (one rub consisting of one forward plus one backward motion), scrape the pigment/binder mixture i
40、nto a heap at the centre of the plate, making sure that any unground pigment is removed from the knife blade. Repeat the rubbing-out operation using a further100rubs and then add a further few drops of the binder to obtain a suitable consistency. Mix-well until the paste is homogeneous, and transfer
41、 it to one corner of the plate. Clean the rest of the plate thoroughly. Take a similar amount of the agreed sample of pigment and prepare a paste in the same way at a consistency equivalent to that used in treating the test portion, even if more or less binder may be required to achieve this consist
42、ency. 6.2.3 Colour comparison Compare the colour of the test portion with that of the agreed sample of pigment as described in6.1.3. 7 Test report The test report shall contain at least the following information: a) the type and identification of the pigment tested; b) a reference of this Internatio
43、nal Standard (ISO787-1); c) the binder used; d) the procedure used (automatic muller, hand muller or palette knife); e) the details of the procedure used when comparing the colours of the strips (see6.1.3); f) the result of the test expressed as colour equal to, or different from, that of the agreed
44、 sample of pigment; g) any deviation, by agreement or otherwise, from the test procedure specified; h) the date of the test. 2) See the paragraph headed “Additional information” in the national foreword.BS3483-A1:1983 BSI 12-1999 3 National appendix At the time of publication of this standard the re
45、lationship 3)between other Parts of this standard and ISO787 was as follows: 3) The relationship is indicated by the symbols: =Identical with s Technically equivalent to Related (but contains technical differences from) Optical properties Part A3 : Comparison of resistance to light of coloured pigme
46、nts of similar types toaspecified light source s ISO787-15 Part A4 : Comparison of relative tinting strength (or equivalent colouring value) and colour on reduction in linseed stand oil using the automatic muller s ISO787-16 Part A5 : Comparison of lightening power of white pigments s ISO787-17 Phys
47、ical properties Part B1 : Determination of residue on sieve (oil method, using the palette knife) (none) Part B2 : Determination of residue on sieve (oil method, using the automatic muller) (none) Part B3 : Determination of residue on sieve (water method, manual procedure) =ISO787-7 Part B4 : Determ
48、ination of residue on sieve (water method, using a mechanical flushing procedure) =ISO787-18 Part B5 : Comparison of ease of dispersion (oscillatory shaking method) s ISO787-20 Part B6 : Determination of matter volatile at105 C =ISO787-2 Part B7 : Determination of oil absorption value =ISO787-5 Part
49、 B8 : Determination of density (pyknometer method) ISO787-10 Part B9 : Determination of density relative to water (using a centrifuge) =ISO787-23 Part B10 : Determination of tamped volume and apparent density after tamping =ISO787-11 Chemical properties Part C1 : Determination of matter soluble in water (hot extraction method) =ISO787-3 Part C2 : Determination of matter soluble in water (cold extraction method) =ISO787-8 Part C3 : Determination of acidity or alkalinity of the aqueous extract =ISO787-4 Part C4 : Determination of pH value of an aqueous su
