1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationLeather Tests for colour fastness Colour fastness to cycles of to-and-fro rubbingBS EN ISO 11640:2012National forewordThis British Standard is the UK implementation of EN ISO 116
2、40:2012. Itsupersedes BS EN ISO 11640:1998 which is withdrawn.The UK participation in its preparation was entrusted to Technical CommitteeTCI/69, Footwear, leather and coated fabrics.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication doe
3、s not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 72958 4ICS 59.140.30Compliance with a British Standard cannot confer immunity fromlegal o
4、bligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 31 December 2012.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN ISO 11640:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 11640 Novemb
5、er 2012 ICS 59.140.30 Supersedes EN ISO 11640:1998English Version Leather - Tests for colour fastness - Colour fastness to cycles of to-and-fro rubbing (ISO 11640:2012) Cuir - Essais de solidit des coloris - Solidit des coloris au frottement en va-et-vient (ISO 11640:2012) Leder - Farbechtheitsprfun
6、g - Bestimmung der Reibechtheit von Frbungen (ISO 11640:2012) This European Standard was approved by CEN on 14 November 2012. 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 w
7、ithout any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any oth
8、er language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic,
9、 Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMM
10、ITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 11640:2012: EBS EN ISO 11640:2012
11、EN ISO 11640:2012 (E) 2 Contents Page Foreword 3BS EN ISO 11640:2012EN ISO 11640:2012 (E) 3 Foreword This document (EN ISO 11640:2012) has been prepared by Technical Committee CEN/TC 289 “Leather“, the secretariat of which is held by UNI, in collaboration with the International Union of Leather Tech
12、nologists and Chemists Societies. 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 May 2013, and conflicting national standards shall be withdrawn at the latest by May 2013. Attention is drawn to t
13、he 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 ISO 11640:1998. According to the CEN/CENELEC Internal Regulations, the national s
14、tandards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania
15、, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 11640:2012 has been approved by CEN as a EN ISO 11640:2012 without any modification. BS EN ISO 11640:2012ISO 11640:20
16、12(E) IULTCS/IUF 450:2012(E) ISO 2012 All rights reserved iiiContents Page 1 Scope 1 2 Normative references 1 3 Principle . 1 4 Apparatus and materials. 2 5 Test specimens 3 6 Conditioning of test specimens and pieces of felt 3 6.1 Dry leather and dry felt . 3 6.2 Wet felt 3 6.3 Wet leather . 3 6.4
17、Felt wetted with artificial perspiration solution 3 7 Procedure . 4 8 Precision 4 9 Test report 5 Annex A (informative) Commercial sources for apparatus and materials 6 BS EN ISO 11640:2012INTERNATIONAL STANDARD ISO 11640:2012(E)IULTCS/IUF 450:2012(E) ISO 2012 All rights reserved 1Leather Tests for
18、colour fastness Colour fastness to cycles of to-and-fro rubbing 1 Scope This International Standard specifies a method for determining the behaviour of the surface of a leather on rubbing with a wool felt. It is applicable to leathers of all kinds. 2 Normative references The following referenced doc
19、uments 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. ISO 105-A01, Textiles Tests for colour fastness Part A01: General principles
20、of testing ISO 105-A02, Textiles Tests for colour fastness Part A02: Grey scale for assessing change in colour ISO 105-A03, Textiles Tests for colour fastness Part A03: Grey scale for assessing staining ISO 105-A04, Textiles Tests for colour fastness Part A04: Method for the instrumental assessment
21、of the degree of staining of adjacent fabrics ISO 105-A05, Textiles Tests for colour fastness Part A05: Instrumental assessment of change in colour for determination of grey scale rating ISO 2418, Leather Chemical, physical and mechanical and fastness tests Sampling location ISO 2419, Leather Physic
22、al and mechanical tests Sample preparation and conditioning ISO 3696:1987, Water for analytical laboratory use Specification and test methods ISO 4045, Leather Chemical tests Determination of pH ISO 9073-2, Textiles Test methods for nonwovens Part 2: Determination of thickness ISO 11641, Leather Tes
23、ts for colour fastness Colour fastness to perspiration 3 Principle One side of the leather specimen is rubbed with pieces of reference wool felt under a given pressure for a given number of forward and backward motions. The degree of colour staining of the wool felt and the change in colour of the l
24、eather are assessed with grey scales. Any other visible change in, or damage to, the surface of the leather is also reported. BS EN ISO 11640:2012ISO 11640:2012(E) IULTCS/IUF 450:2012(E) 2 ISO 2012 All rights reservedThe general colour fastness testing principles shall be in accordance with those de
25、scribed in ISO 105-A01, taking into account that the substrate is leather. 4 Apparatus and materials Ordinary laboratory apparatus and 4.1 Rub fastness test apparatus incorporating the elements specified in 4.1.1 to 4.1.3, and optionally including those described in 4.1.4. 4.1.1 A carriage with: a)
26、a horizontal, completely planar metal platform; b) a holder for fastening the leather to the platform, leaving approximately 80 mm exposed; c) a device with which the leather may be extended at least 20 % linearly in the direction of rubbing. 4.1.2 A finger, 500 g 25 g in mass, removable, yet able t
27、o be fixed firmly in place and able to freely move vertically, with: a) a base measuring 15 mm 15 mm; b) a device for attaching pieces of wool felt (4.2) to the base; the depth of the cavity shall be 3,9 mm 0,1 mm; c) a weight-piece of mass 500 g 10 g to load the finger up to a total mass of 1 000 g
28、 35 g; d) means of lowering the finger with the base flat onto the test specimen. 4.1.3 Means for driving the carriage to and fro with a distance of travel of 35 mm to 40 mm at a frequency of 40 cycles/min 2 cycles/min for the complete forward and backward motion. 4.1.4 Convenient, but not essential
29、, elements as follows: a) means of adjusting the position of the finger at right angles to the direction of rubbing, so that two or three positions may be used for rubbing on one piece of leather; b) a motor to drive the carriage forward and backward (see 4.1.3); c) means for pre-selecting a given n
30、umber of cycles. 4.2 Rubbing material, square pieces of white or black wool felt, measuring approximately 15 mm 15 mm, punched out of a sheet of pure wool felt meeting the following specification: pH of water extract between 4,5 and 8,0, according to ISO 4045; mass per unit area: 1 900 g/m2 150 g/m2
31、; thickness, determined in accordance with ISO 9073-2, Method A: 6,0 mm 0,5 mm. The black felt shall be dyed with Acid Black 24 (C.l. 26370). NOTE An example of suitable wool felts available commercially is given in Annex A. 4.3 Vessel suitable for evacuation, e.g. vacuum-desiccator. BS EN ISO 11640
32、:2012ISO 11640:2012(E) IULTCS/IUF 450:2012(E) ISO 2012 All rights reserved 34.4 Vacuum pump, capable of evacuating the vessel (4.3). For the wetting of leather, according to 6.3, the vacuum pump shall be capable of achieving approximately 5 kPa. 4.5 Demineralized water, grade 3 in accordance with IS
33、O 3696:1987. 4.6 Grey scale for assessing staining, in accordance with ISO 105-A03. 4.7 Grey scale for assessing change in colour, in accordance with ISO 105-A02. 4.8 Spectrophotometer or colorimeter for assessing change in colour and staining, complying with ISO 105-A04 and ISO 105-A05. 5 Test spec
34、imens 5.1 If the piece of leather available for testing is a whole hide or skin, then first take a sample in accordance with ISO 2418. 5.2 Test specimens shall be rectangular pieces of leather, at least 100 mm long and, for each position of the finger see 4.1.4 a), at least 20 mm wide. Usually with
35、one set of conditions (conditioning of leather and felt, number of cycles, etc.) only one specimen is tested. In case of dispute, it is strongly recommended to test several specimens, sampled from different positions on the hide or skin. 6 Conditioning of test specimens and pieces of felt 6.1 Dry le
36、ather and dry felt Condition leather and wool felt in accordance with ISO 2419. 6.2 Wet felt Wet the felt by placing pieces of felt in demineralized water (4.5). Heat the water to boiling and allow it to boil gently until the felt pieces sink. Then decant off the hot water and replace it with cold d
37、emineralized water. Allow to stand until the wetted felt pieces have reached room temperature. Take each piece of felt from the water just before use and squeeze or wipe it in order to reduce its water uptake to approximately 1 g. The wet pieces of felt shall not be allowed to soak in the water for
38、more than 24 h. 6.3 Wet leather Wet the leather by immersing specimens in demineralized water (4.5) in such a way that there is no contact between specimens. Place the containing vessel in the vacuum vessel (4.3), produce a vacuum of approximately 5 kPa and hold it for 2 min. Restore normal pressure
39、. Carry out this procedure two more times. Just before use, take the specimens out of the water and remove excess water on their surfaces with blotting paper. The specimens shall not be allowed to soak in the water for more than 1 h. 6.4 Felt wetted with artificial perspiration solution Wet the felt
40、 with the alkaline artificial perspiration solution, prepared as specified in ISO 11641. Place the containing vessel in the vacuum vessel (4.3), evacuating and restoring pressure repeatedly until the felt BS EN ISO 11640:2012ISO 11640:2012(E) IULTCS/IUF 450:2012(E) 4 ISO 2012 All rights reservedpiec
41、es sink. Just before use, take each felt piece out of the solution and squeeze or wipe it in order to reduce its uptake of artificial perspiration solution to approximately 1 g. The felt shall not be allowed to soak in the artificial perspiration solution for more than 24 h. 7 Procedure 7.1 Mount a
42、conditioned specimen on the apparatus and stretch it 10 % in the direction of rubbing. If the specimen cannot be extended linearly by 10 %, stretch it less or not at all. If the specimen at 10 % extension does not remain stable during rubbing, stretch it sufficiently to achieve stability. In both of
43、 the latter cases, state the extension in the test report. 7.2 For normal leathers, attach the weight-piece so that the total mass of the finger is 1 000 g 35 g (4.1.2). NOTE Due to the higher friction on suede leathers and suede-like leathers, it can be desirable in such cases to carry out the test
44、 with a total mass of 500 g 25 g (i.e. without the additional weight-piece). 7.3 Attach a piece of conditioned felt to the finger (4.1.2). Place the finger on the leather and carry out the required number of cycles. At completion of the test, lift the finger off the leather test specimen, especially
45、 if using wet felts. 7.4 If required, repeat the test with another number of cycles with the finger in a fresh position on the specimen (or a new specimen) and after replacing the felt by a new piece. 7.5 In the case of a pilling effect on the felt, the test should be repeated. If the pilling effect
46、 re-occurs, report this in the test report. 7.6 Release the specimen and assess the rubbed area on the specimen and/or on the pieces of felt for change in colour and staining, respectively, as specified in 7.7. Wetted specimens and pieces of felt shall be dried at ambient temperature before assessme
47、nt. If required by the client, white or light coloured leathers can be tested with a black felt. Slight discoloration of the leather, due to colour rub-off from the felt, may be possible. In this case, do not assess the change in colour of the leather. This shall be assessed after rubbing in a diffe
48、rent place with a white felt. 7.7 Using D65 illumination according to ISO 105-A01, visually assess the change in colour of the leather (4.7) and the staining (4.6) of the pieces of felt with the grey scales in accordance with ISO 105-A02 and ISO 105-A03. For the assessment of the felts after the tes
49、t, reference felts shall be used which have been treated in the same way as the tested felt, e.g. for wet test, the reference felt is wetted with water and dried. Note any other visible changes in the surface of the specimen, e.g. loss of gloss, development of polish, flattening of the nap or destruction of finish. 7.8 Alternatively, provided the staining and colour change is even, the grey scale staining and colour difference can be assessed instrumentally (4
