BS EN 12720-2009 家具.冷液体表面电阻的评估.pdf

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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of an identical text or by endorsement, at the latest by August 2009, and conflicting national standards shall be withdrawn at the latest by August 2009.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 identifying any or all such patent rights. This document supersedes EN 12720:1997. Informative Annex C 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 the 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, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. ÞÍ ÛÒ ïîéîðæîððç EN 12720:2009 (E) 5 1 Scope This European standard specifies a method for the assessment of the resistance to cold liquids of all rigid 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 size sufficient to meet the requirements of the test. The test shall be carried out on unused surfaces. The type and number of test liquids (Annex A) and the test periods (Table 1) shall be stated in requirement specifications or shall be agreed upon between purchaser and supplier or interested parties. Annex A (normative) includes a selection of suitable test liquids. Other liquids can be used if required. Annex B (informative) describes a direct light source. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 105 E04:1996, Textiles Tests for colour fastness Part E04: Colour fastness to perspiration (ISO 105-E04:1994) ISO 1065:1991, Non-ionic surface-active agents obtained from ethylene oxide and mixed non-ionic surface- active agents Determination of cloud point 3 Terms and definitions 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 the test panel 3.3 test area part of the test surface under the glass Petri dish (5.2) ÞÍ ÛÒ ïîéîðæîððç EN 12720:2009 (E) 6 4 Principle Discs saturated with the test liquids are placed on the test surface and covered by a glass Petri dish. After a specified test period, the discs are removed and the test surface is left for 16 h to 24 h. Thereafter, the test surface is cleaned 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 Discs Discs with a diameter of (25 2) mm, of soft filter paper with a grammage of 400 g/m² to 500 g/m², without colouring agent and glue. 5.2 Glass Petri dish Glass Petri dish with ground edges and without lips, external diameter (40 2) mm, and height (25 2) mm. 5.3 Tweezers 5.4 Absorbent paper or tissue 5.5 Cleaning cloth White soft absorbent cloth. 5.6 Diffuse light source Light source providing evenly diffused light 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 temperature of (6500 ± 50) K and an Ra greater than 92, by using a colour matching booth in accordance with EN ISO 3668:2001. 1 5.7 Test liquid Examples of the test liquids are given in Annex A (normative). 5.8 Deionized or distilled water 5.9 Cleansing solution Solution containing 15 ml/l of the cleansing agent (5.10) in water (5.8). The solution shall be discarded after one day. 5.10 Cleansing agent Cleansing agent of the following composition: a) 12,5% (m/m) of a sodium primary C10 to C14 polymer alkyl aryl sulphonate, ÞÍ ÛÒ ïîéîðæîððç EN 12720:2009 (E) 7 b) 12,5% (m/m) polyethoxylated derivatives of primary or secondary C8 to C16 alcohols with 5 to 15 ethoxylated groups having a cloud point of 25 °C to 75 °C in 1% (m/m) aqueous solution (determination of cloud point is described in ISO 1065:1991), c) 5,0% (m/m) ethanol, d) 70% (m/m) water (5.8). The cleansing agent shall be stored in a glass bottle in a cool dark place and shall be used within one year of the day of preparation. 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) °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 of a size sufficient to meet the requirements of Clause 7 regarding the separation of the discs (5.1). 7 Test procedure 7.1 Testing Immediately after conditioning, the test shall be carried out in a test atmosphere of (23 ± 2) °C. The test surface shall be placed horizontally. It shall be tested with the chosen test liquids at points which shall be not less than 60 mm apart, from centre to centre, and if possible, with centres not less than 40 mm from any edge of the test surface. If there is any reason to suppose that the properties of the test surface may vary, two tests shall be carried out. The test surface shall be lightly wiped with a cleaning cloth (5.5) before testing. Use clean tweezers for each type of liquid. Immerse a disc (5.1) into the test liquid (5.7) between 30 s and 60 s, lift with the tweezers (5.3) and quickly wipe off the edge of the disc once against the edge of the vessel. Quickly place it on the test surface and immediately cover with an inverted glass Petri dish (5.2). The filter paper shall not be in contact with the edge of the glass Petri dish. Record the position of each test liquid. After the test period, remove the glass Petri dish and lift off the disc with the tweezers. Do not remove fibres of paper adhering to the test surface. Soak up any remaining test liquid with the absorbent paper (5.4) without rubbing and leave the test surface undisturbed for 16 h to 24 h in the test atmosphere without covering it. The test surface shall be sufficiently protected against dust without limiting in any way the free access of air. After the above 16 h to 24 h, wash the test surface by lightly rubbing it with the cleaning cloth (5.5) soaked first in cleansing solution (5.9) and then only water (5.8). Finally wipe the surface lightly with a dry cleaning cloth (5.5). ÞÍ ÛÒ ïîéîðæîððç EN 12720:2009 (E) 8 Leave the test surface undisturbed, without covering it, for 30 min in the test atmosphere. 7.2 Test periods Test periods shall be selected from the Table 1. The periods have been chosen to simulate the range of times that may elapse before a liquid, applied to the surface of furniture, would be removed. Table 1 Test periods Period Examples under consideration 10 s Immediate removal 2 min Quick removal 10 min After a short time 1 h After a meal or similar 6 h After work or other activity 16 h As soon as possible next day 24 h After one day 7 days After one week 28 days Long-term action 8 Examination of the test panel Carefully examine the test surface using the light source (5.6), for changes caused by the test liquids, e. g. discoloration, change in gloss and colour, blistering, swelling and other defects. For this purpose illuminate the surface separately and examine from different angles, directions and planes, including angle combinations such that the light is reflected from the test surface and towards the observer's eye. The viewing distance shall be 0,25 m to 1,0 m. Changes caused by the test liquids shall also be determined by touching the surface. ÞÍ ÛÒ ïîéîðæîððç EN 12720:2009 (E) 9 9 Assessment of results Rate the test surfaces by comparing the test area with the area surrounding it for each liquid according to Table 2: Table 2 Descriptive numerical rating code Numerical rating Description 5 No change test area indistinguishable from adjacent surrounding area 4 Minor change test area distinguishable from adjacent surrounding area, only when the light source is mirrored on the test surface and is reflected towards the observer's eye, e. g. discoloration, change in gloss and colour no change in the surface structure, e.g. swelling, fibre raising, cracking, blistering 3 Moderate change test area 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 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 raising, 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 filter paper adhering to the surface Each test surface shall be 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 liquid or liquids (relevant data); ÞÍ ÛÒ ïîéîðæîððç EN 12720:2009 (E) 10 d) conditioning time; e) the test period or periods; f) the assessment of each test surface in accordance with Clause 9; g) if liquids (Table A.1) in italic type are used, source should be described; h) if applicable, test results using the direct light source (Annex B (informative); i) if applicable, additional information regarding type of damage; j) any deviations from this European standard; k) name and address of the test facility; l) date of the test. ÞÍ ÛÒ ïîéîðæîððç EN 12720:2009 (E) 11 Annex A (normative) Liquids for testing surface A.1 General This annex gives examples of liquids, generally available in the home and places of work, which are suitable for assessment of the resistance to liquids of the surface of furniture. Any other agreed liquids may be used. A.2 Liquids The purity of the chemicals shall be at least equivalent to recognized analytical grade where available. Deionized or distilled water shall be used for the preparation of aqueous solutions. The test liquid shall be stored in a sealed glass bottle in a dark place and shall be conditioned in the test atmosphere prior to use. Table A.1 Liquids Designation No. Description Acetic acid 1.1 1.2 10% (m/m) aqueous solution 4,4% (m/m) aqueous solution Acetone 2 - Ammonia solutiona 3 10% (m/m) aqueous solution Citric acid 4 10% (m/m) aqueous solution Cleansing agent 5 See 5.11 Coffeeb 6 40 g of instant coffee, freeze dried, in 1 l of boiling water Disinfectant 7.1 Phenol derivatives, 0,5% aqueo