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1、BS EN 12721:2009 ICS 97.140 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Furniture Assessment of surface resistance to wet heat Licensed CopyChinese University of Hong Kong, 11/04/2009 07:14, Uncontrolled Copy, (c) BSI This British Standard was published un
2、der the authority of the Standards Policy and Strategy Committee on 31 March 2009 BSI 2009 ISBN 978 0 580 57244 9 Amendments/corrigenda issued since publication DateComments BS EN 12721:2009 National foreword This British Standard is the UK implementation of EN 12721:2009. It supersedes BS EN 12721:
3、1997 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee FW/0/1, Common test methods. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisi
4、ons of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Licensed CopyChinese University of Hong Kong, 11/04/2009 07:14, Uncontrolled Copy, (c) BSI BS EN 12721:2009 EUROPEAN STANDARD NORME EUROPENNE EUROPI
5、SCHE NORM EN 12721 February 2009 ICS 97.140Supersedes EN 12721:1997 English Version Furniture - Assessment of surface resistance to wet heat Meubles - valuation de la rsistance de la surface la chaleur humide Mbel - Bewertung der Bestndigkeit von Oberflchen gegen feuchte Hitze This European Standard
6、 was approved by CEN on 3 January 2009. 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 bibliographical references concerning such
7、 national standards may be obtained on application to the CEN Management Centre 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 a CEN member into its own language
8、 and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxem
9、bourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CENAll right
10、s of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12721:2009: E Licensed CopyChinese University of Hong Kong, 11/04/2009 07:14, Uncontrolled Copy, (c) BSI BS EN 12721:2009 EN 12721:2009 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative referen
11、ces 4 3 Terms and definitions .4 4 Principle 5 5 Apparatus and materials .5 5.1 Thermometer 5 5.2 Heat source 5 5.3 Oven 6 5.4 Cleaning cloth 6 5.5 White polyamide fibre cloth 6 5.6 Deionized or distilled water 7 5.7 Heat-insulating foam .7 5.8 Diffuse light source .7 6 Preparation and conditioning
12、.7 6.1 Conditioning .7 6.2 Test surface 7 7 Test procedure .7 7.1 Testing 7 7.2 Test temperatures 8 8 Examination of the test panel .8 9 Assessment of results 8 10 Test report 9 Annex A (informative) Direct light source 10 A.1 General . 10 A.2 Apparatus 10 Annex B (informative) Significant technical
13、 changes in revised edition of this standard . 12 Bibliography . 13 Tables Table 1 Descriptive numerical rating code 8 Figures Figure 1 Aluminium block used as heat source .6 Figure A.1 Viewing cabinet 11 Licensed CopyChinese University of Hong Kong, 11/04/2009 07:14, Uncontrolled Copy, (c) BSI BS E
14、N 12721:2009 EN 12721:2009(E) 3 Foreword This document (EN 12721:2009) has been prepared by Technical Committee CEN/TC 207 “Furniture”, the secretariat of which is held by UNI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by e
15、ndorsement, at the latest by August 2009, and conflicting national standards shall be withdrawn at the latest by August 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for ide
16、ntifying any or all such patent rights. This document supersedes EN 12721:1997. Informative Annex B provides details of significant technical changes between this European Standard and the previous edition. According to the CEN/CENELEC Internal Regulations, the national standards organizations of th
17、e following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovaki
18、a, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Licensed CopyChinese University of Hong Kong, 11/04/2009 07:14, Uncontrolled Copy, (c) BSI BS EN 12721:2009 EN 12721:2009 (E) 4 1 Scope This European standard specifies a method for the assessment of the resistance to wet heat of all ri
19、gid furniture surfaces regardless of materials. It does not apply to leather and textile surfaces. The test is intended to be carried out on a part of the finished furniture, but can be carried out on test panels of the same material, finished in an identical manner to the finished product, and of a
20、 size sufficient to meet the requirements of the test. The test should be carried out on unused surfaces. Annex A (informative) describes a direct light source. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, onl
21、y the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 4287:1998, Geometrical Product Specifications (GPS) Surface texture: Profile method Terms, definitions and surface texture parameters (ISO 4287:1997) EN ISO 4
22、288:1997, Geometrical Product Specifications (GPS) Surface texture: Profile method Rules and procedures for the assessment of surface texture (ISO 4288:1996) ISO 209:2007, Aluminium and aluminium alloys Chemical composition ISO 1770:1981, Solid-stem general purpose thermometers 3 Terms and definitio
23、ns For the purposes of this document, the following terms and definitions apply. 3.1 test panel panel including the test surface NOTE It may be cut from a finished item of furniture or it may be a separate panel produced in the same manner as the finished item of furniture. 3.2 test surface part of
24、the test panel 3.3 test area part of the test surface under the heat source (5.2) Licensed CopyChinese University of Hong Kong, 11/04/2009 07:14, Uncontrolled Copy, (c) BSI BS EN 12721:2009 EN 12721:2009(E) 5 3.4 roughness Ra arithmetic mean of the absolute values of the profile deviations from the
25、mean line 4 Principle A standard aluminium alloy block at a specified test temperature is placed on a damp cloth in contact with the test surface. After a specified test period, the block and damp cloth are removed and the test surface is left for 16 h to 24 h. Thereafter, the test surface is cleane
26、d and examined for damages such as discolouration, change in gloss, change in colour, blistering and swelling. The test result is stated in a numerical rating code. 5 Apparatus and materials 5.1 Thermometer As specified in ISO 1770:1981, capable of insertion to the bottom of the centre bore of the h
27、eat source (5.2) or other means of measuring the temperature of the heat source to an accuracy of 1 C. 5.2 Heat source A block as shown in Figure 1 manufactured from aluminium alloy according to ISO 209:2007, Al Mg Si (alloy shall contain more than 94% aluminium). The roughness of bottom surface sha
28、ll be (2 1) m, expressed as Ra, according to EN ISO 4287:1998 and EN ISO 4288:1997. NOTE Alloy 6060 and 64430 are suitable The following tolerances are applicable: Lengths: 0,2 mm of the nominal length Angles: 2 of the nominal angle Licensed CopyChinese University of Hong Kong, 11/04/2009 07:14, Unc
29、ontrolled Copy, (c) BSI BS EN 12721:2009 EN 12721:2009 (E) 6 Dimensions in millimetres Figure 1 Aluminium block used as heat source 5.3 Oven An oven which can heat the heat source to a temperature higher than the test temperature. 5.4 Cleaning cloth White soft absorbent cloth. 5.5 White polyamide fi
30、bre cloth A plain weave having approximately 40 threads/cm in both warp and weft direction, weighing approximately 50 g/m, and cut (120 3) mm square. Licensed CopyChinese University of Hong Kong, 11/04/2009 07:14, Uncontrolled Copy, (c) BSI BS EN 12721:2009 EN 12721:2009(E) 7 5.6 Deionized or distil
31、led water 5.7 Heat-insulating foam A melamine foam, with the following characteristics: density between 8,5 kg/m3 and 11,5 kg/m3; heat conductivity, less than 0,035 W/mK. The foam shall withstand at a temperature higher than 200 C. 5.8 Diffuse light source Light source providing evenly diffused ligh
32、t, giving an illumination on the test surface of (1200 400) lx. This may either be diffused daylight or be diffused artificial daylight. NOTE The daylight should be unaffected by surrounding trees, etc. When artificial daylight is used it is recommended that it should have a correlated colour temper
33、ature of (6500 50) K and an Ra greater than 92, by using a colour matching booth in accordance with EN ISO 3668:2001. 1 6 Preparation and conditioning 6.1 Conditioning Conditioning of test surface shall begin at least one week before testing and shall be carried out in air at a temperature of (23 2)
34、 C and relative humidity of (50 5)%. The conditioning time shall be stated in the test report. 6.2 Test surface The test surface shall be substantially flat and with a size sufficient to meet the requirements of Clause 7. 7 Test procedure 7.1 Testing Immediately after conditioning, the test shall be
35、 carried out in a test atmosphere of (23 2) C. The test surface shall be placed horizontally. It shall accommodate the required number of tests, with at least 15 mm spacing between the perimeter of adjacent test surfaces, and between the perimeters of the test surfaces and the edges of the panel. Wh
36、ere tests are carried out simultaneously, the perimeters of the test surfaces shall be separated by a minimum of 50 mm. If there is any reason to suppose that the properties of the test surface may vary, two identical tests shall be carried out simultaneously. The test surface shall be lightly wiped
37、 with a cleaning cloth (5.4) before the testing. Using the oven (5.3), raise the temperature of the heat source to a temperature higher than the specified test temperature, and transfer it to the heat insulating foam (5.7). Place the thermometer (5.1) or other means of measuring temperature in the c
38、entre bore of the heat source (5.2). If the temperature is not higher than the specified test temperature, the heat source shall be placed again in the oven until achieving this higher temperature. Place the white polyamide fibre cloth (5.5) centrally on the test surface. Spread (2 0,2) cm3 of disti
39、lled or deionized water (5.6) uniformly over the whole area of the white polyamide fibre cloth. NOTE A graduated eye dropper is suitable for dispensing the distilled or deionised water. Licensed CopyChinese University of Hong Kong, 11/04/2009 07:14, Uncontrolled Copy, (c) BSI BS EN 12721:2009 EN 127
40、21:2009 (E) 8 When the heat source reaches the specified test temperature with an accuracy of 1 C, immediately place it on the centre of the white polyamide fibre cloth. After 20 min in this position, remove the block. Wipe the test surface dry with the cleaning cloth (5.4) when it has cooled. Recor
41、d the position of each test surface and its temperature. Allow the test surface to stand undisturbed from 16 h to 24 h. Wipe each test surface with the cleaning cloth (5.4) and examine the test panel. 7.2 Test temperatures The test temperatures shall be stated in requirement specifications, selected
42、 from the following: 55 C 70 C 85 C 100 C 8 Examination of the test panel Carefully examine the test surface using the light source (5.8), for damage, e. g. discoloration, change in gloss and colour, blistering, swelling and other defects. For this purpose illuminate the surface separately and exami
43、ne from different angles, directions and planes, including angle combinations such that the light is reflected from the test surface and towards the observers eye. Viewing distance shall be 0,25 m to 1,0 m. Changes caused by the test shall also be determined by touching the surface. 9 Assessment of
44、results Rate the test surfaces by comparing the test area with the area surrounding it according to Table 1: Table 1 Descriptive numerical rating code Numerical rating Description 5 No change test area indistinguishable from adjacent surrounding area 4 Minor change test area distinguishable from adj
45、acent surrounding area, only when the light source is mirrored on the test surface and is reflected towards the observers eye, e. g. discoloration, change in gloss and colour no change in the surface structure, e.g. deformation, swelling, fibre raising, cracking, blistering 3 Moderate change test ar
46、ea distinguishable from adjacent surrounding area, visible in several viewing directions, e. g. discoloration, change in gloss and colour no change in the surface structure, e.g. swelling, fibre raising, cracking, blistering Licensed CopyChinese University of Hong Kong, 11/04/2009 07:14, Uncontrolle
47、d Copy, (c) BSI BS EN 12721:2009 EN 12721:2009(E) 9 2 Significant change test area clearly distinguishable from adjacent surrounding area, visible in all viewing directions, e. g. discoloration, change in gloss and colour, and / or structure of the surface slightly changed, e.g. swelling, fibre rais
48、ing, cracking, blistering 1 Strong change the structure of the surface being distinctly changed and / or discoloration, change in gloss and colour, and / or the surface material being totally or partially removed, and / or the polyamide fibre cloth adhering to the surface Each test surface shall be
49、rated by an experienced observer. In cases of doubt, three observers shall be required. All observers shall have good colour vision. In case of three observers, the reported rating for the test surface shall be the average to the nearest nominal value. Duplicate tests shall be assessed and reported separately. 10 Test report The test report shall include at least the following information: a) reference to this European Standard; b) description of the test panel (relevant data); c) the test tem
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