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1、BRITISH STANDARD BS EN ISO 787-15:1995 Incorporating Amendment No. 1 General methods of test for pigments and extenders Part 15: Comparison of resistance to light of coloured pigments of similar types The European Standard EN ISO 787-15:1995 has the status of a British Standard Licensed Copy: sheffi
2、eldun sheffieldun, na, Mon Nov 20 02:56:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 787-15:1995 This British Standard, 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
3、effect on 29 February 1988 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 83/50746 DC ISBN 0 580 16394 6 Amendments issued since publication Amd. No.Date of issueComment
4、s 8684December 1995 Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:56:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 787-15:1995 BSI 03-2000i Contents Page National forewordii Foreword2 Text of EN ISO 787-153 Publications referred toInside ba
5、ck cover Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:56:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 787-15:1995 ii BSI 03-2000 National foreword This revision of Part A3 of BS 3483 has been prepared under the direction of the Pigments, Paints and Varnishes Standards Committ
6、ee. It is identical with ISO 787-15:1986 “General methods of test for pigments and extenders Part 15: Comparison of resistance to light of coloured pigments of similar types” published by the International Organization for Standardization (ISO). This revision supersedes BS 3483-A3:1974, which is wit
7、hdrawn. In 1995 the European Committee for Standardization (CEN) accepted ISO 787-15:1986 as European Standard EN ISO 787-15:1995. As a consequence of implementing the European Standard this British Standard is renumbered as BS EN ISO 787-15 and any reference to BS 3483-A3 should be read as a refere
8、nce to BS EN ISO 787-15. BS 3483-A3 was first published 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 changes in this edition are as follows: a) the natural light and artificial
9、light sources and exposures are both specified; b) comparisons 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 Sta
10、ndard that the execution 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. Some terminology and certain conv
11、entions 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 the words “International Standa
12、rd” 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 787-15” should be read as “BS 3483-A3”. The Technical Committee has reviewed the provisions of ISO 105:Section B01 and ISO 105:Section B02, to
13、which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A related British Standard to ISO 105:Section B01 is BS 1006:Section B01 “Methods of test for colour fastness of textiles and leather. Blue wool standards”. No British Standard co
14、rresponds to ISO 105:Section B02. Cross-references International StandardCorresponding British Standard ISO 105-A02:1984BS 1006 Methods of test for colour fastness of textiles and leather A02:1978 Grey scale for assessing change in coloura (Technically equivalent) ISO 842:1984BS 4726:1986 Methods fo
15、r sampling raw materials for paints and varnishes (Identical) ISO 4892:1981BS 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 shou
16、ld be made to BS 1006 “Methods of test for colour fastness of textiles and leather” for the general principles on the use of the scale. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:56:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 787-15:1995 BSI 03-2000iii The Technical Commit
17、tee 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 use in conjunction with this standard. The publications are published by Commission Internationale dclairage (CIE) and obtainable
18、 from the Honorary Librarian (National Illumination Committee), c/o Thorn Lighting Limited, Great Cambridge Road, Enfield, Middlesex EN1 1UL. 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
19、the parties concerned (see clause 3). It is also necessary to agree supplementary information (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 appli
20、cation. 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 i to iv, the EN ISO title page, pages 2 to 8, an inside back cover and a back cover. This standard has been updat
21、ed (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, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, M
22、on Nov 20 02:56:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 787-15 August 1995 ICS 87.060.10 Descriptors: Paints, pigments, tests, daylight tests, determination, daylight resistance English version General methods of test for pigments and ex
23、tenders Part 15: Comparison of resistance to light of coloured pigments of similar types (ISO 787-15:1986) Mthodes gnrales dessai des pigments et matires de charge Partie 15: Comparaison de la rsistance la lumire des pigments colors de types semblables (ISO 787-15:1986) Allgemeine Prfverfahren fr Pi
24、gmente und Fllstoffe Teil 15: Vergleich der Bestndigkeit bei Belichtung von Buntpigmenten hnlichen Typs (ISO 787-15:1986) 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 giving this
25、 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 versions (En
26、glish, 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, Denmark,
27、 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 36, B-10
28、50 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 787-15:1995 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:56:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 787-15:1995 BSI
29、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 be given
30、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 bound to i
31、mplement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword2 0Introduction3 1Scope and field of application3 2References4 3P
32、rinciple4 4Apparatus and materials4 5Sampling7 6Procedure7 7Test report7 Figure Spectral irradiance of the total radiation in spectral bands6 Table Irradiance of the total radiation in spectral bands, in watts per square metre and in percentage of ET= 1 120 W/m25 Licensed Copy: sheffieldun sheffield
33、un, na, Mon Nov 20 02:56:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 787-15:1995 BSI 03-20003 0 Introduction This document is a part of ISO 787, General methods of test for pigments and extenders. The terms “resistance to light” and “light fastness (or colour fastness)” describe the resista
34、nce of a material 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
35、 identical 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
36、 vary continuously 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. C
37、onsequently 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
38、 compositions, 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 l
39、ight source 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 ISO 787 by allowing the agreed binder (medium) to consist of a dispersion of suc
40、h a pigment. 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
41、 also inadvisable 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 grade 4 and 3 of the grey scale in accordanc
42、e with ISO 105, section A02. 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 relate
43、d to the product 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)
44、The method of dispersion 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 th
45、e light source. 1 Scope and field of application This part of ISO 787 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 method A, the material
46、 is exposed under 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 International Standard relating to
47、 that pigment, indicating 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. Lice
48、nsed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:56:50 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 787-15:1995 4 BSI 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; S
49、ection B02: Colour fastness to artificial light: Xenon arc fading lamp test. ISO 842, Raw materials for paints and varnishes Sampling. 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 each dispersed in the same agreed binder (medium). The dispersions are applied to a substrate and dried; th
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