1、- CEN- EN*ISO*787- 15 95 3404589 OLLbb54 T3b A - BRITISHSTANDARD 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 IS0 787-15 : 1995 has the statils of a British Standard BS EN IS0 787-15 1995
2、CEN ENtIS0*787- 35 95 = 3404589 0336655 972 EUROPEAN STANDARD A NOFWE EUROPXNNE EUROPmHE NOW EN IS0 787-15 August 1995 ICs 87 060 10 Descriptors Paints, pigments, tests, daylight tests, tieterniination, daylight resistance Enghsh version General methods of test for pigrnents and extenders - Part 15:
3、 Comparison of resistance to light of coloured pigments of similar types (IS0 787-15 : 1986) Mthodes gnrales dessai des pigments et matires de charge - Partie 15: Comparaison de la rsistance la lumire des pigments (IS0 787-15 : 1986) Allgemeine Prufverfahren fr Pigmente und Fullstoffe - Teil 15 Verg
4、leich der Bestnigkeit bei Belichtung von Buntpigmenten hnlichen Typs colors de types semblables (IS0 787-15 : 1986) This European Standard was approved by CEN on 19950323. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European
5、 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 niember. This European Standard exists in three official versions (English, F
6、rench, Gem). A version, in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Centrai Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland,
7、France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. GEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee ir Normung Centrai Secretariat: rue de Stassart 36, B-1050 Brussel
8、s O 1995 AU rights of reproduction and communicatiOn m any form and by any means reserved in ali countxies to CEN and its members Ref. NO. EN IS0 787-15 1995 E - - - - CEN EN*IS0*787- 15 95 3404589 OLLbb56 809 M EN IS0 787-15 : 1995 Foreword The text of the International Standard from ISORY: 35, Pai
9、nts and varnishes, of the Intemaional rganization for Standardization (ISO) has been taken over as a European Standard by the Technical Committee CENRY: 298, Pigments and extenders. This European Standard shaii be given the status of a nationai standard, either by publication of an identical text or
10、 by endorsement, at the latest by February 1996, and conflicting national standards shail be withdrawn at the latect by February 1996 According to CENKENELEC internal Regulations, the following countries are bound to implement this European Standard: Astrb, Belgium, Denmark, Finland, France, Germany
11、, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugai, Spain, Sweden, Switzerland and the United Kingdom. i CEN EN*IS0*787- It5 75 3404587 OLLbb57 745 National foreword This revision of Part A3 of BS 3483 has been prepared under the direction of the Pigments, Paints and Varnis
12、hes Standards Committee. It is identical with IS0 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
13、 : Part A3 : 1974, which is withdrawn. In 1995 the European Cornuttee for Standardi7;i.iori (CEN) accepted IS0 787-15 : 1986 as European Standard EN IS0 787-15 : lCW5. As a consequence of implementing the Euopean Standard this British Standard is renumbered as BS EN IS0 78F-15 and any reference to B
14、S 3483 : Part A3 should be read as a reference to BS EN IS0 787-15.-, BS 3483 I Pad A3 was fint published in 1974 and this first revision brings the standard into line with international agreements by implementing the ISOstandard as an identical British Standard. The main changes in this edition are
15、 as follows: -. , A (a) the natural light and artificial 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 updat
16、ed. It has been assumed in the drafting of this British Standard that the execution of its provisjons 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 St
17、andard 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 the baseline as t
18、he decimal marker. Wherever the words international Standard appear, referring to this standard, they should be read as British Standard, this part of IS0 787 should be read as this Part of BS 3483. and IS0 787/15 should be read as ES 3483 : Part A3. British Standards Institution BS 3483 : Part A3 :
19、 1988 Cross-references IS0 105 : Section A02 - 1 984 IS0 842-1984 IS0 4892-1981 International standard Corresponding British Standard BS 1006 Methods of test for colour fastness of textiles and leather A02 : 1978 Grey scale for assessing change in colOur* (Technically equivalent) BS 4726 : 1986 Meth
20、ods for sampling raw materials for paints and varnishes (Identical) BC 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) The Technical Committ
21、ee has reviewed the provisions of IS0 105 : Section BO1 and IS0 105 : Section B02, to 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 IS0 105 : Section BO1 is BS 1006 : BO1 Methods.of test for colo
22、ur fastness of textiles and leather. Blue wool standards. No British Standard corresponds to IS0 105 : Section B02. 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 acceptab
23、le for 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 EN1 IUL. Additional information
24、. 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 3). It is also necessary to agree supplementary information (see clause O) before commencing the comparison. Compliance with a Bri
25、tish Standard does not of itself confer immunity from legal obligations. *Reference should be made to ES 1006 Methods of test for colour fastness of textiles and leather for the general principles on the use of the scale. 2 CEN EN*IS0*787- 15 95 3404589 OlLbb59 518 BS 3483 : Part A3 : 1988 , O Intro
26、duction This document is a part of IS0 787, Generalmethods of test for pigments and extenders. The terms “resistance to light“ and “light fastness (or colour fastness)“ describe the resistance of a material to change in its appearance as a result of exposure to light. The magnitude of the change, if
27、 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 components but in different proportions, may not have the same resistance to light. Also, two compo-
28、 sitions 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 continuously because of the large number of variables (for example intensity and spectral distribution
29、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. Conse- quently expressing the results as a function of time alone is not recommended. These considerations for
30、m 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 compositions, in a suitable form, are examined for any difference in their change of ap- pearance after ex
31、posure 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 source for the same period of time. In addition, the light fastness of a pigment may be affected by
32、the presence of other pigments such as titanium dioxide. This important aspect may be accommodated in this part of IS0 787 by allowing the agreed binder (medium) to consist of a disper- sion of such a pigment. The test procedure is then followed as described. The extent to which the change on exposu
33、re is allowed to pro- ceed 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 inad- visable to wait until the amount of change is large. Thus, it is recommended that compari
34、sons 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 accordance with IS0 105, section A02. For any particular application, the method of test described in this I
35、nternational 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 product under test or, if ap- propriate. should be agreed beiween the interested parties.
36、a) Type and ideritification of the agreed reference pigment. b) The binder (medium) for dispersion of the test sample and the agreed reference pigment and details of the com- position of the dispersion. ci The method of dispersion to be used. dl Whether the test is to be carried out under natural ex
37、- posure (method A) or artificial light (method B. e) test specimens and glass cover. f) and of the light source. If method A is to be used, the exposure angle of the If method B IS to be used, the details of the apparatus 3 CEN EN*ISO*787- L5 95 = 3404589 OLL6660 23T = BS 3483 : Part A3 : 1988 1 Th
38、is part of IS0 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 is exposed under glass to natural light. In method
39、 B, the material is exposed to direct artificial light. Scope and field of application NOTE - When either of these general methods IA 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 that pig- ment,
40、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. 2 References IS0 10
41、5, Textiles - Tests for colour fastness - Section A02: Grey scale for assessing change in colour. Section BOI: Colour fastness to light: Daylight. Section 602: Colour fastness to artifcial light: Xenon arc fading lamp test. IS0 842, Raw materials for paints and varnishes - Sampling. IS0 4892, Plasti
42、cs - Methods of exposure to laboratory light sources. CIE Publication No. 20 (TC-2.21, Recommendations for the in- tegrated irradiance and the spectral distribution of simulated solar radiation for testing purposes. i 3 Principle The test sample and the agreed reference pigment are each dispersed in
43、 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 (method A) or to artificial light (method E) under specified conditions. The resistance to light is asked by comparing the change in colour of
44、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 and non-absorbent surface for the application of paint or b) paper used as
45、 substrate for mass tone prints. 4.2 Film applicator or other device, suitable for applying, -. side by side, two films of wet thickness 50 to 100 pm, or a suitable apparatus for preparing mass tone prints with a thickness of about 1.5 pm. 4.3 material. Cover sheet, of aluminium foil or other suitab
46、le opaque 4.4 with IS0 105, section A02. Grey scale for assessing change in colour, complying 4.5 Agreed reference pigment, for comparison with the test sample. It shall be agreed between the parties and shall be similar in composition to that of the test sample. 4.6 Binder (medium) to be agreed bet
47、ween the interested parties. Its choice should be made with regard to the field of ap- plication of the pigments being tested. 4.7 Cabinet for exposure under glass to natural light (for method Al. Q !; The exposure cabinet shall have a glass cover and shall be of a sufficient size IO carry out the e
48、xpected number of tests. The cabinet shall be constructed of metal, wood or other material capable of protecting the coated test substrates (specimens) from rain and similar climatic effects, and there shall be adequate ventilation to allow free flow of air over the test specimens. The glass cover s
49、hall be a single piece of clear sheet glass, of thickness 2 to 3 mm, and free from bubbles or other imperfec- tions. The transmittance of the glass shall be approximately 90 % at 360 nm and throughout the visible region of the spec- trum, falling to a transmittance of less than 1 % at 300 nm and shorter wavelengths. To maintain these characteristics it is usually necessary to clean the glass periodically and to replace the glass at intervals of not more than 2 years. The cabinet shall be fitted with a means of support that allows the spec
