1、March 2013 Translation by DIN-Sprachendienst.English price group 9No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 5
2、9.140.30!$on“1957675www.din.deDDIN EN ISO 14268Leather Physical and mechanical tests Determination of water vapour permeability (ISO 14268:2012);English version EN ISO 14268:2012,English translation of DIN EN ISO 14268:2013-03Leder Physikalische und mechanische Prfungen Bestimmung der Wasserdampfdur
3、chlssigkeit (ISO 14268:2012);Englische Fassung EN ISO 14268:2012,Englische bersetzung von DIN EN ISO 14268:2013-03Cuir Essais physiques et mcaniques Dtermination de la permabilit la vapeur deau (ISO 14268:2012);Version anglaise EN ISO 14268:2012,Traduction anglaise de DIN EN ISO 14268:2013-03Superse
4、desDIN EN ISO 14268:2003-10www.beuth.deDocument comprises 14 pagesIn case of doubt, the German-language original shall be considered authoritative.02.13DIN EN ISO 14268:2013-03 2 A comma is used as the decimal marker. National foreword This document (EN ISO 14268:2012) has been prepared by Technical
5、 Committee CEN/TC 289 “Leather” (Secretariat: UNI, Italy) in collaboration with the International Union of Leather Technologists and Chemists Societies (IULTCS). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Wo
6、rking Committee NA 062-05-51 AA Anforderungen und physikalische Prfverfahren fr Leder und seine Ausgangsprodukte. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 2418 DIN EN ISO 2418 ISO 2419 DIN EN ISO 2419 ISO 2589 DIN EN ISO 2589 ISO
7、 5402-1 DIN EN ISO 5402-1 ISO 17229 DIN EN ISO 17229 Amendments This standard differs from DIN EN ISO 14268:2003 as follows: a) Subclause 5.2 specifies the preferred method of sample preparation if no pre-treatment is specifically required by the customer; b) Subclause 5.3 specifies that the test sp
8、ecimens are to be conditioned before carrying out the test; c) Subclause 6.3 describes the sealing with beeswax, where necessary; d) Annex A “Sources of apparatus” has been updated; e) Annex ZA (informative) has been deleted. Previous editions DIN 53333: 1948-12, 1981-08 DIN EN ISO 14268: 2003-10 DI
9、N EN ISO 14268:2013-03 3 National Annex NA (informative) Bibliography DIN EN ISO 2418, Leather Chemical, physical and mechanical and fastness tests Sampling location DIN EN ISO 2419, Leather Physical and mechanical tests Sample preparation and conditioning DIN EN ISO 2589, Leather Physical and mecha
10、nical tests Determination of thickness DIN EN ISO 5402-1, Leather Determination of flex resistance Part 1: Flexometer method DIN EN ISO 17229, Leather Physical and mechanical tests Determination of water vapour absorption DIN EN ISO 14268:2013-03 4 This page is intentionally blank EUROPEAN STANDARD
11、NORME EUROPENNE EUROPISCHE NORM EN ISO 14268 November 2012 ICS 59.140.30 Supersedes EN ISO 14268:2002English Version Leather - Physical and mechanical tests - Determination of water vapour permeability (ISO 14268:2012) Cuir - Essais physiques et mcaniques - Dtermination de la permabilit la vapeur de
12、au (ISO 14268:2012) Leder - Physikalische und mechanische Prfungen - Bestimmung der Wasserdampfdurchlssigkeit(ISO 14268:2012) This European Standard was approved by CEN on 31 October 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for gi
13、ving this European 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 CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three of
14、ficial versions (English, French, German). A version in any other 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
15、of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, 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
16、, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE 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 nati
17、onal Members. Ref. No. EN ISO 14268:2012: EContents Page Foreword . 3 1 Scope 4 2 Normative references 4 3 Principle . 4 4 Apparatus . 4 5 Sampling and sample preparation . 5 6 Procedure . 6 7 Expression of results 7 8 Test report 7 Annex A (informative) Sources of apparatus . 8 Annex B (informative
18、) Water vapour number . 9 Bibliography 10 DIN EN ISO 14268:2013-03 EN ISO 14268:2012 (E) 2Foreword This document (EN ISO 14268:2012) 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 Techno
19、logists 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 the
20、 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 14268:2002. According to the CEN/CENELEC Internal Regulations, the national sta
21、ndards 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,
22、Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN ISO 14268:2013-03 EN ISO 14268:2012 (E) 3 1 Scope This International Standard describes a method for determining the water vapour permeability of l
23、eather and provides alternative methods of sample preparation. 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
24、 (including any amendments) applies. ISO 2418, Leather Chemical, physical and mechanical and fastness tests Sampling location ISO 2419, Leather Physical and mechanical tests Sample preparation and conditioning ISO 2589, Leather Physical and mechanical tests Determination of thickness ISO 5402-1, Lea
25、ther Determination of flex resistance Part 1: Flexometer method 3 Principle The test piece is clamped over the opening of a container which contains a solid desiccant and is placed in a strong current of air in a standard atmosphere. The air inside the container is constantly agitated by the desicca
26、nt which is kept in motion by the rotation of the container. The container is weighed at the start and the end of the test and the mass of moisture which has been absorbed by the desiccant is determined from the difference. 4 Apparatus 4.1 Containers, in the form of jars or bottles, with a neck of i
27、nternal diameter 30 mm 3 mm fitted with a screw top with a circular opening whose diameter is equal to the internal diameter of the neck. Suitable containers typically have a height range of 70 mm to 90 mm. 4.2 Test machine, including the following: 4.2.1 Vertically mounted turntable, rotating at 75
28、 r/min 5 r/min, capable of holding containers (4.1) with their axis parallel to and 67 mm 2 mm from the axis of rotation of the turntable. 4.2.2 Fan, mounted in front of the mouths of the containers consisting of three flat blades in planes that are inclined 120 to one another. The planes of the bla
29、des pass through the prolongation of the axis of the vertically mounted turntable (4.2.1). The blades are of approximate dimensions 90 mm 75 mm and the 90 mm side nearest the mouths of the jars passes them at a distance of 10 mm 5 mm. The fan rotates at 1400 r/min 100 r/min with the direction of rot
30、ation being opposite to that of the vertically mounted turntable. The general arrangement of the turntable and fan are as shown in Figure 1. DIN EN ISO 14268:2013-03 EN ISO 14268:2012 (E) 44.3 Self-indicating silica gel desiccant, particle size 2 mm to 5 mm sieved to remove small particles and dust,
31、 and freshly regenerated by heating in a ventilated oven for at least 16 h at 125 C 5 C, then cooling to standard temperature in a hermetically sealed vessel. The granular size of the crystals shall be such that they shall not pass through a 2 mm sieve. The silica gel shall not be used if it is warm
32、er than the test piece. NOTE 1 Silica gel beads are preferred to granules as they generate less dust. NOTE 2 Large volumes of silica gel will only cool slowly in a closed vessel. A long cooling time may be needed to ensure that all the silica gel has cooled to standard temperature. 4.4 Balance, weig
33、hing to 0,001 g. 4.5 Stop clock, reading to 1 min. 4.6 Vernier callipers, reading to 0,1 mm and capable of measuring the internal diameter of the necks of the containers. 4.7 Press knife, as specified in ISO 2419, capable of cutting circular test pieces of a suitable size to allow a good seal at the
34、 open end of the container (4.1). 4.8 Beeswax. 4.9 Abrasive paper, grade P180. Dimension in millimetres Figure 1 General arrangement of test machine 4.10 Flex machine, as specified in ISO 5402-1, if test pieces are to be subjected to flexing prior to test. 5 Sampling and sample preparation 5.1 Sampl
35、e in accordance with ISO 2418. Cut three test pieces by applying the press knife (4.7) to the grain surface. DIN EN ISO 14268:2013-03 EN ISO 14268:2012 (E) 5 If necessary, determine the thickness, as specified in ISO 2589, to ensure test pieces are below 3,0 mm thickness. NOTE If there is a requirem
36、ent for more than two hides or skins to be tested in one batch, then only one sample need be taken from each hide or skin, provided that the overall total is not less than three test pieces. 5.2 Prepare the three test pieces by one of the following methods; if no pre-treatment is specifically requir
37、ed then procedure c) is the preferred method: a) Cut a square piece of minimum size 50 mm. Place the piece grain upwards on a flat surface, press a piece of P180 grade abrasive paper (4.9) against the leather and draw it across the leather 10 times in various directions under a load of about 2 N app
38、lied by hand pressure. Cut a circular test piece from the buffed area using the press knife specified in 4.7. b) Flex a sample for 20 000 cycles using the method and apparatus specified in ISO 5402-1. Cut a circular test piece from the flexed area using the press knife specified in 4.7. c) Cut a tes
39、t piece using the press knife specified in 4.7. Many leathers have on the grain a surface coat which reduces the water vapour permeability of the leather, but which has less effect after the coat has been flexed or exposed to slight abrasive action. The treatments specified in a) and b) are intended
40、 to simulate the abrasion which the leather would receive in wear. If no pre-treatment is required, method c) may be used, and this option can be preferable for suede and unfinished leathers. 5.3 Condition the test specimens (5.2) in accordance with ISO 2419 and carry out the test in the standard at
41、mosphere. 6 Procedure 6.1 Half fill a container with freshly regenerated silica gel. 6.2 Place a test piece centrally over the open container so that the surface which is exposed to the higher humidity when the final product is in use is uppermost. 6.3 Fit a screw top to the container and tighten so
42、 that the test piece is securely held around the edge and the container is sealed. If it is necessary to seal the junction between the test piece and the neck of the jar, warm the bottle and apply a thin layer of beeswax (4.8) to the flat surface of the neck. If the opening of the jar has been coate
43、d with beeswax, warm to (50 5) C before introducing the silica gel and fixing the test piece. 6.4 Place the container on the turntable (4.2.1) and start the test machine. NOTE It might be necessary to use additional containers made up as in 6.1 to 6.3 to ensure that the turntable is balanced. 6.5 Us
44、ing vernier callipers (4.6), measure the internal diameter of the neck of a second container (to the nearest 0,1 mm) in two mutually perpendicular directions and calculate the mean diameter. 6.6 After 20 h 4 h, remove the first container from the test machine then, as rapidly as possible, half fill
45、the second container with freshly regenerated silica gel. Remove the test piece and screw top from the first container, place them on the second container (keeping the same side facing outwards) and weigh the second container with the silica gel and test piece. Record the mass (m0). 6.7 If the test
46、piece is approximately 3 mm in thickness or is heavily embossed or is expected to have a vapour permeability below 5 mg/(cm2h), the end surface of the neck of the second container, taken in 6.5, should be dipped in melted beeswax. Afterwards, half fill the second container with freshly regenerated s
47、ilica gel. Remove the test piece and screw top from the first container, place them on the second container DIN EN ISO 14268:2013-03 EN ISO 14268:2012 (E) 6(keeping the same side facing outwards) and weigh the second container with the silica gel and test piece. Record the mass (m0). 6.8 Replace the
48、 container on the vertical turntable and start the test machine and stop clock. 6.9 After 11,5 h 4,5 h, stop the test machine and note the time. 6.10 Remove the container and reweigh it. Record the mass (m1). 7 Expression of results Calculate the water vapour permeability, Pwv,in milligrams per squa
49、re centimetre hour, using the following equation. wv27639 mPdt where m is the increase in mass of the container (m1 m0), in milligrams; d is the mean diameter of the neck of the container, in millimetres; t is the time between the first and second weighing, in minutes. NOTE The constant 7 639 arises from the conversion of t
