1、 - STD-BSI BS EN 12877-3-ENGL 2000 lbZibb9 082Zb9b T2T BRITISH STANDARD Colouring materials in plastics - Determination of colour stability to heat during processing of colouring materials in plastics - Part 3: Determination by oven test The European Standard EN 1287731999 has the status of a Britis
2、h Standard ICs 83.040.30 NO COPING WITHOUT BSI PERMISSION EXCEPT AS PERMITED BY COPYRIGHT LAW IS EN 2877-3:2000 STD=BSI BS EN L2877-3-ENGL ZU00 D LbZLibb7 UAZ2b77 7bb D BS EN 128773:2000 been prepared under the direction of the Sector AmdNo. Committee for Materiais and Chemicals, was published under
3、 the authority of the Standards Committee and comes into effect on 15 January 2000 O BSI 01-2000 ISBN O 580 35859 3 National foreword Date Comments This Brithh Standard is the English ianguage version of EN 128773: 1999. The UK participation in its preparation was entrusted to Technical Committee SW
4、l, Rgments,which has the responsibility ta - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposais for change, and keep the UK interests informed
5、; them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the sectio
6、n entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. C
7、ompliance 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, the EN title page, pages 2 to 5 and a back cover. The ES1 copyright notice displayed in this document indicates when the documen
8、t was last issued. - STD*BSI BS EN L2877-3-ENGL 2000 m lb24bb9 0822b78 8T2 m EUROPEAN STANDARD NORME EUROPEENNE EN i28773 EUROPISCHE NORM October 1999 ICs 83.040.30 English version Colouring materials in plastics - Determination of colour stability to heat during processing of colouring materials in
9、 plastics - Part 3: Determination by oven test Matires colorantes dans les plastiques - Dtermination de la stabilit de la couleur a la chaleur au cours de la mise en oeuvre des matires colorantes dans les plastiques - Partie 3: Dtermination par essai ltuve Farbmittel in Kunststoffen - Bestimmung der
10、 Bestndigkeit der Farbe gegen Hitze beim Verarbeiten von Farbmitteln in Kunststoffen - Teil 3: Bestimmung durch Prfung im Wrmeschrank This European Standard was approved by CEN on 5 September 1999. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the condition
11、s for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning sich national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three offi
12、cial versions (English, French, German). A version in any other language made by tmslation under the responsibilw of a CEN member into its own language and notified to the Central Secretariat has the same status as he official versions. CEN members are the national standards bodies of Austria, Belgi
13、um, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Noway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Central Secretariat: r
14、ue de Stassart, 36 8-1050 Brussels O 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12877-3:1999 E STDmBSI BS EN 12877-3-ENGL 2000 Lb24bb9 0822b99 739 = Page 2 EN 12877-3: 1999 Foreword This European Standard has been prepare
15、d by Technical Committee CENiTC 298, Pigments and extenders, the Secretariat of which is held by DIN. 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 April 2000, and conflicting national standards
16、 shall be withdrawn at the latest by April 2000. Annex A (normative) indicates test conditions for polyvinyl chloride. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cz
17、ech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Introduction This is one of a number of Parts of EN 12877 dealing with methods for determining the colour stability of colou
18、ring materials under the influence of the thermal stress encountered during plastics processing. It should be read in conjunction with EN 12877-1. 1 Scope This part of EN 12877 describes a method for determining the colour stability of colouring materials in plastics under defined conditions by an o
19、ven test. The result of the determination is a relative value, not an absolute one. The method is mainly used for testing colouring materials in polyvinyl chloride, and in thermosetting materials. 2 Normative references This European Standard incorporates by dated or undated reference, provisions fr
20、om other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendm
21、ent or revision. For undated references the latest edition of the publication referred to applies. EN 12877-111999 Colouring materials in plastics - Determination of colour stability to heat during processing of colouring materials in plastics - Part 1 : General introduction EN 128774 1999 Colouring
22、 materials in plastics - Determination of colour stability to heat during processing of colouring materials in plastics - Part 4: Determination by two-roll milling Textiles - Tests for colour fastness - Part A02: Grey scale for assessing change in colour (IS0 105A02:1993) Paints and varnishes - Colo
23、rimetry - Part 2: Colour measurement Paints and varnishes - Colorimetry - Part 3: Calculation of colour differences EN 201 OSA02 IS0 7724-211 984 IS0 7724-3 3 Principle Specimens prepared from the colouring material to be tested and the plastics material are subjected to elevated temperatures in an
24、air oven for a specified period. The change in the colour of these specimens, determined by comparison with the colour of untreated specimens, is taken as a measure of the colour stability of the colouring material. The colour comparison is performed either colorimetrically or visually. QBSI 01-2000
25、 STD*BSI BS EN L2d77-3-ENGL 2000 W Lb2LibbS 0822700 280 Page 3 EN 12877-33 999 4 Materials 4.1 Test medium, to be agreed between the interested parties. When evaluating pigments in polyvinyl chloride, the test medium shall be adequately stabilized to heat. The colour stability of the test medium whe
26、n subjected to heat shall therefore be tested with and without titanium dioxide pigment, using the same procedure. If there are changes, these shall be taken into account when expressing test results. 4.2 Titanium dioxide pigment, grade as recommended for use in plastics 5 Apparatus 5.1 Air circulat
27、ing oven, capable of maintaining temperatures up to 250C preferably to within f 1 “C, but not exeeding f 3 “C. The oven shall be capable of regaining the test temperatures within 30 s after the specimen has been placed in it. It shall be fitted with forced-ventilation equipment. Shelves shall be suc
28、h that they allow the free circulation of air within the oven. To regain the test temperature in the specified time, the air oven may be provided with a drawer in the door and/or a metal block for higher heat capacity. 5.2 Temperature-measuring device, for measuring the temperature in the oven as cl
29、ose as posible to the specimens. 5.3 Aluminium sheets, uncoated and degreased, of thickness 0,2 mm to 0,4 mm. The sheets shall be a few centimeters smaller than the shelves or drawers of the oven. The front edge of the sheets may be bent upwards to facilitate handling. 5.4 Plate press, provided with
30、 a heating and cooling system. 5.5 Spectrophotometer or tristimulus colorimeter, for colour measurements in accordance with IS0 7724-2. 6 Sampling See EN 12877-1. 7 Test specimens 7.1 Form and dimensions Unless otherwise specified or agreed, test specimens of dimensions 50 mm x 50 mm x I mm, suitabl
31、e for colorimetry, shall be used. 7.2 Concentration of colouring materiai The colouring material shall be tested in reduced shade (7.2.1) and/or in full shade (7.2.2). 7.2.1 For testing in reduced shade, the concentration of the colouring material in the test medium shall correspond to: a) 1/3 stand
32、ard depth of shade (SD) in accordance with EN 12877-1:1999, annex A; or b) 1/25 standard depth of shade (SD) in accordance with EN 12877-1:1999, annex A; or c) an agreed reduction ratio. For a test specimen thickness of 1 mm 5 % of titanium dioxide pigment is necessary to obtain full hiding. 7.2.2 F
33、or testing in full shade, the concentration of the colouring material in the test medium shall correspond to 7.2.1 a). Alternatively, a concentration of 0,l % (preferred for organic pigments and dyestuffs), or 2 % (preferred for inorganic pigments) or another agreed appropriate concentration shall b
34、e taken. OBSI 01-2000 STD-BSI BS EN L2877-3-ENGL 2000 m lb24bb7 0822702 227 m Page 4 EN 12877-3: 1999 8 Procedure When testing colouring materials in polyvinyl chloride prepare test specimens as described in EN 12877-4:1999 clause 8, first paragraph. 8.1 Place the test specimens on aluminium sheets
35、(5.3) at room temperature. Then place the aluminium sheets with the specimens in the oven (5.1), preheated to the specified or agreed test temperature and leave for the specified or agreed period of time. For standard test conditions (combinations of test temperature and period of time), see annex A
36、. When the Specified or agreed period of time is completed, remove the aluminium sheets with the test specimens from the oven and allow to cool to room temperature. In the case of polyvinyl chloride, press the treated test specimens at 170 OC for 1 min, using the plate press (5.4) and sufficient pre
37、ssure to ensure a smooth surface of the test specimen. 8.2 Compare the colour of the upper surface of the treated test specimens with that of untreated test specimens either colorimetrically or visually. NOTE Colouring materials such as C.I. Pigment Red 48, 53 and 57 and dyestuffs can change colour
38、reversibly after heat treatment and the specimens should be maintained at room temperature for at least 16 h before assessment. If colour measurement is specified, proceed in accordance with IS0 7724-2:1984,4.1.1, and IS0 7724-3. For visual comparison, use the grey scale specified in EN 20105-AO2 9
39、Expression of results Express the test results either as a colour difference in accordance with IS0 7724-3, or as a step of the grey scale, together with the direction of any colour change. 10 Test report The test report shall contain at least the following information: a) a reference to this Europe
40、an Standard (EN 12877-3); b) all details necessary to identi the colouring material tested; c) all details necessary to identify the test medium together with any other additives used, including the titanium dioxide pigment; d) all details of preparation of the test specimens; e) the chosen standard
41、 depth(s) of shade or full shade and the concentrations of the colouring material tested; 9 if colour measurement has been specified: type of spectrophotometer or tristimulus colorimeter as well as standard illuminant and standard observer used; g) the test conditions (temperature, precision of oven
42、 and duration); h) conditions of pressing the treated test specimens (if applicable); i) the result of the test, as indicated in clause 9; j) all visual observations, for example discolouration of the test medium or blooming of the colouring material; k) any deviation from the test method specified;
43、 i) the date of the test. 11 Precision Statistical data can not be established. OBSI 01-2000 STD-BSI BS EN 12877-3-ENGL 2000 H lh24bb7 0822702 053 Page 5 EN 12877-311999 Annex A (normative) Plastics material used Polyvinyl chloride Standard test conditions Temperature Period of heating OC min 180 OC
44、 30 Unless othennrise specified, the test conditions shall be agreed between the interested parties. Whenever possible, they shall be selected from the combinations given in Table A.1. Table A.1 - Standard test conditions Appropriate test conditions for other plastics materials may be agreed between
45、 the interested parties. OBSI 01-2000 BS EN 12877-3:ZoOO BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is
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