1、BRITISH STANDARD BS EN ISO 787-15:1995 Incorporating Amendment No. 1 General methods of testfor pigments and extenders Part 15: Comparison of resistance to light of coloured pigments of similar types The European Standard ENISO787-15:1995 has the status of a BritishStandardBSENISO787-15:1995 This Br
2、itish Standard, having been prepared under the directionof the Pigments, Paintsand Varnishes StandardsCommittee, was published underthe authority ofthe Board of BSIand comesintoeffect on 29February1988 BSI 03-2000 First published March 1974 First revision February 1988 The following BSI references r
3、elate to the work on this standard: Committee reference PVC/1 Draft for comment 83/50746 DC ISBN 0 580 16394 6 Amendments issued since publication Amd. No. Date of issue Comments 8684 December 1995 Indicated by a sideline in the marginBSENISO787-15:1995 BSI 03-2000 i Contents Page National foreword
4、ii Foreword 2 Text of EN ISO 787-15 3 Publications referred to Inside back coverBSENISO787-15:1995 ii BSI 03-2000 National foreword This revision of Part A3 of BS3483 has been prepared under the direction of the Pigments, Paints and Varnishes Standards Committee. It is identical with ISO787-15:1986
5、“General methods of test for pigments and extenders Part15: Comparison of resistance to light of coloured pigments of similar types” published by the International Organization for Standardization (ISO). This revision supersedes BS3483-A3:1974, which is withdrawn. In 1995 the European Committee for
6、Standardization (CEN) accepted ISO787-15:1986 as European Standard ENISO787-15:1995. As a consequence of implementing the European Standard this British Standard is renumbered as BSENISO787-15 and any reference to BS3483-A3 should be read as a reference to BSENISO787-15. BS 3483-A3 was first publish
7、ed in1974 and this first revision brings the standard into line with international agreements by implementing the ISO standard as an identical British Standard. The main changes in this edition are as follows: a) the natural light and artificial light sources and exposures are both specified; b) com
8、parisons under natural light exposure for light fastness are recommended to be compared using the blue wool scale to assist evaluation; c) the referencing to the grey scale has been updated. It has been assumed in the drafting of this British Standard that the execution of its provisions will be ent
9、rusted 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. Some terminology and certain conventions are not identical with those used in British S
10、tandards; 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 the words “International Standard” appear, referring to this standard, they should be
11、 read as “British Standard”, “this part of ISO787” should be read as “this Part of BS3483”, and “ISO787-15” should be read as “BS3483-A3”. The Technical Committee has reviewed the provisions of ISO105:Section B01 and ISO105:Section B02, to which reference is made in the text, and has decided that th
12、ey are acceptable for use in conjunction with this standard. A related British Standard to ISO105:SectionB01 is BS1006:Section B01 “Methods of test for colour fastness of textiles and leather. Blue wool standards”. No British Standard corresponds to ISO105:Section B02. Cross-references International
13、 Standard Corresponding British Standard ISO 105-A02:1984 BS 1006 Methods of test for colour fastness of textiles and leather A02:1978 Grey scale for assessing change in colour a (Technically equivalent) ISO 842:1984 BS 4726:1986 Methods for sampling raw materials for paints and varnishes (Identical
14、) ISO 4892:1981 BS 2782 Methods of testing plastics Method 540B:1982 Methods of exposure to laboratory light sources, (xenon arc lamp, enclosed carbon arc lamp, open-flame carbon arc lamp, fluorescent tube lamps) (Identical) a Reference should be made to BS1006 “Methods of test for colour fastness o
15、f textiles and leather” for the general principles on the use of the scale.BSENISO787-15:1995 BSI 03-2000 iii The Technical Committee has also reviewed the relevant provisions of the CIE Publication No.20 (TC-2.2), to which reference is made in the text, and has decided that they are acceptable for
16、use in conjunction with this standard. The publications are published by Commission Internationale dclairage (CIE) and obtainable from the Honorary Librarian (National Illumination Committee), c/o Thorn Lighting Limited, Great Cambridge Road, Enfield, Middlesex EN11UL. Additional information. In ord
17、er 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 clause3). It is also necessary to agree supplementary information (see clause0) before commencing the comparison. A British Standard does not pur
18、port 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 legal obligations. Summary of pages This document comprises a front cover, an inside front
19、cover, pagesi toiv, theENISO title page, pages2 to8, 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 blankEUROPEAN STANDARD NORME EUROPENNE
20、EUROPISCHE NORM ENISO787-15 August 1995 ICS 87.060.10 Descriptors: Paints, pigments, tests, daylight tests, determination, daylight resistance English version General methods of test for pigments and extenders Part15: Comparison of resistance to light of coloured pigments of similar types (ISO 787-1
21、5:1986) Mthodes gnrales dessai des pigments et matires de charge Partie15: Comparaison de la rsistance la lumire des pigments colors de types semblables (ISO 787-15:1986) Allgemeine Prfverfahren fr Pigmente und Fllstoffe Teil15: Vergleich der Bestndigkeit bei Belichtung von Buntpigmenten hnlichen Ty
22、ps (ISO787-15:1986) 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 any alteration. Up-to-date lists and bibli
23、ographical 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 translation under the responsibility of
24、 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, Luxembourg, Netherlands, Norway, Portugal,
25、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 any form and by any means reserved in a
26、ll countries to CEN and its members Ref. No. EN ISO 787-15:1995 EENISO787-15:1995 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 as a European Standard by the Technical
27、 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 withdrawn at the latest by February1996. Acc
28、ording 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, Switzerland and the UnitedKingdom. Conten
29、ts Page Foreword 2 0 Introduction 3 1 Scope and field of application 3 2 References 4 3 Principle 4 4 Apparatus and materials 4 5 Sampling 7 6 Procedure 7 7 Test report 7 Figure Spectral irradiance of the total radiation in spectral bands 6 Table Irradiance of the total radiation in spectral bands,
30、in watts per square metre and in percentage of E T =1120W/m 2 5ENISO787-15:1995 BSI 03-2000 3 0 Introduction This document is a part of ISO787, General methods of test for pigments and extenders. The terms “resistance to light” and “light fastness (or colour fastness)” describe the resistance of a m
31、aterial to change in its appearance as a result of exposure to light. The magnitude of the change, if any, is influenced by the quantity and quality of the light to which the material is exposed, and by the nature and composition of the material itself. Two compositions, each consisting of identical
32、 components but in different proportions, may not have the same resistance to light. Also, two compositions each consisting of the same proportions of similar, but not identical, components may not have the same resistance to light. When exposed to natural light, the conditions of the test vary cont
33、inuously because of the large number of variables (for example intensity and spectral distribution of the light, temperature, relative humidity, and the amount and nature of atmospheric contaminants) and therefore results cannot be related to similar tests carried out on other occasions. Consequentl
34、y expressing the results as a function of time alone is not recommended. These considerations form the basis for the comparison of light fastness of two different samples of a coloured pigment. Each sample is incorporated in the same proportion in otherwise identical compositions and these compositi
35、ons, in a suitable form, are examined for any difference in their change of appearance after exposure to the same quantity and quality of light. In order to comply with these exposure conditions, it is necessary for the compositions to be exposed side by side at the same time to the same light sourc
36、e for the same period of time. In addition, the light fastness of a pigment may be affected by the presence of other pigments such as titanium dioxide. This important aspect may be accommodated in this part of ISO787 by allowing the agreed binder (medium) to consist of a dispersion of such a pigment
37、. The test procedure is then followed as described. The extent to which the change on exposure is allowed to proceed before the comparison is made, may be of importance. It is unrealistic to assess the exposures when the change is only equivalent to the first perceptible change, but it is also inadv
38、isable to wait until the amount of change is large. Thus, it is recommended that comparisons of change of appearance be made when the amount of change of the pigment with known resistance to light (agreed reference pigment) is equal to fastness grade4 and3 of the grey scale in accordance with ISO105
39、, sectionA02. 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)national standard or other document related to the produc
40、t under test or, if appropriate, should be agreed between the interested parties. a) Type and identification of the agreed reference pigment. b) The binder (medium) for dispersion of the test sample and the agreed reference pigment and details of the composition of the dispersion. c) The method of d
41、ispersion to be used. d) Whether the test is to be carried out under natural exposure (method A) or artificial light (method B). e) If method A is to be used, the exposure angle of the test specimens and glass cover. f) If method B is to be used, the details of the apparatus and of the light source.
42、 1 Scope and field of application This part of ISO787 describes a general method of test for comparing the resistance to light of samples of similar types of coloured pigments (agreed reference pigment and test sample). Two methods of exposure are described. In methodA, the material is exposed under
43、 glass to natural light. In method B, the material is exposed to direct artificial light. NOTEWhen either of these general methods (A or B) is applicable to a given pigment, only a cross-reference to the appropriate method should be included in the InternationalStandard relating to that pigment, ind
44、icating any detailed modification that may be needed in view of the special properties of the product. Only when the procedures given in this general method are not applicable to a particular product should a different method for comparison of resistance to light be specified.ENISO787-15:1995 4 BSI
45、03-2000 2 References ISO 105, Textiles Tests for colour fastness. Section A02: Grey scale for assessing change in colour; Section B01: Colour fastness to light: Daylight; Section B02: Colour fastness to artificial light: Xenon arc fading lamp test. ISO 842, Raw materials for paints and varnishes Sam
46、pling. ISO 4892, Plastics Methods of exposure to laboratory light sources. CIE Publication No.20 (TC-2.2), Recommendations for the integrated irradiance and the spectral distribution of simulated solar radiation for testing purposes. 3 Principle The test sample and the agreed reference pigment are e
47、ach dispersed in the same agreed binder (medium). The dispersions are applied to a substrate and dried; they are then exposed to natural daylight with protection from rain (methodA) or to artificial light (method B) underspecified conditions. The resistance to light is assessed by comparing the chan
48、ge in colour of the test sample to that of the agreed reference pigment. 4 Apparatus and materials 4.1 Substrate a) aluminium or rigid cardboard panels of suitable size for the applicator used, and with a white high gloss, light fast, coated andnon-absorbent surface for the application ofpaint or b)
49、 paper used as substrate for mass tone prints. 4.2 Film applicator or other device, suitable for applying, side by side, two films of wet thickness50 to1004m, or a suitable apparatus for preparing mass tone prints with a thickness of about1,54m. 4.3 Cover sheet, of aluminium foil or other suitable opaque material. 4.4 Grey scale for assessing change in colour, complying with ISO105, sectionA02. 4.5 Agreed reference pigment, for comparison with the test sample. It shall be agreed between the parties and shall be similar in composit
