1、 STD-BSI BS EN Lib-l-ENGL 1798 W Lb24bb9 0743383 b89 BRITISH STANDARD Rubber- or plastics-coated fabrics - Low temperature tests Part 1. Bending test The European Standard EN 18761 : 1997 has the status of a British Standard ICs 69.080.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PEBMIITED BY COPY
2、RIGHT LAW BS EN 1876-1 : 1998 Incovmtng Amendment No. 1 STDmSI BS EN L87b-2-ENGL 1778 = Lb24bb7 074L3BLi 515 m BS EN 1876-1 : 1998 Issue 2, December 1998 been prepared under the direction of the Sector Committee for Materiais and Chemicals, was published under the authority of the Standards Committe
3、e and comes into effect on 15 February 1998 Amd. No. 10219 0 MI 1998 National foreword Date Text affected December Second paragraph of National foreword replaced 1998 NMp. 7-4% This British Standard is the English language version of EN 18761: 1997 published by the European Committee for Standardiza
4、tion (CEN). It supersedes method 1OB of BS 3424 : Part 8 : 1983. BS EN 18762 : 1998 (Impact test on loop) provides an aditional low temperature This British Standard is technically equivalent to IS0 4675. The UK participation in its preparation was entrusted to Technical Committee TCi78, Coated fabr
5、ics, which has the responsibility to: IteSt - aid enquirers to understand the text; - present to the responsible European committee any enquiries on the interpretation, or proposais for change, and keep the UK interests informed; - monitor related international and European developments and promulga
6、te 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 intemationai or European publications referred to in this document may be found in the BSI Standards Catalogue under the section
7、 entitled International Standards Correspondence Index, or by using the Find faciliw 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. Complia
8、nce with a British Standard does not of itself confer immunity from legal obligations. I ISBN O 580 29454 4 STD-BSI BS EN 187b-L-ENGL 1998 Lb24bb9 0743385 451 Iscue 1, December 1998 BS EN 1876-1 : 1998 Summary of pages The following table identifies the current issue of each page. Issue 1 indicates
9、that a page has been introduced for the first time by amendment. Subsequent issue numbers indicate an updated page. Vertical sidelining on replacement pages indicates the most recent changes (amendment, adition, deletion). Front cover Inside front cover a b EN titie page 2 Issue II Page I Issue Orig
10、inal Original Original :lank 11; Original Original Inside back cover blank Original Back cover O BSI 1998 a STD*BSI BS EN L87b-L-ENGL 1778 Lb24bb7 07q138b 398 EUROPEAN STANDARD NORME EUROPENNE EUROPmcHE NORM EN 1876-1 October 1997 ICs 59.080.40 Descriptors: Textiies, coated fabrics, fabrics coated w
11、ith rubber, fabrics coated with plastics, tests, low temperature tests, bend tests English version Rubber- or plasticscoakd fabrics - Low-ternperatm tests - Part 1: Bending test Supports texliies revtus de caoutchouc ou de piastique - Essais basse temprature - Partie 1: Essai de phage Mit Kautschuk
12、oder Kunststoff beschichtete “kxtien - Prufungen bei niedrigen Temperaturen - Teil 1: Biegeversuch This European Standard was approved by CEN on 26 September 1997. CEN members are bound to comply with the CENKENELEC Intemal Regulations which stipuate the conditions for giving this European Standard
13、the status of a national standard without any alteration. Uptodate lists and bibliographid references concerning such national standards may be obtajned on application to the Centrai Secretariat or to any CEN member. This European Standard exiss in three official versions (English, French, German).
14、A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland
15、, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fur Normung Centrai Secretariat: rue de Stassart 36, B-1060 Brussels
16、 O 1997 CEN AU rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 18761 : 1997 E . 1 Page2 EN 18761 : 1997 Foreword This European Standard has been prepared by Technical Committee CENRC 248 lbtiles and textile products, the secretariat of whi
17、ch is held by BSI. 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 413 1998, and conflicting national standards shall be withdrawn at the iatest by 4ni 1998. According to the CENKENELEC Internal R
18、egulations, the national standards organizations of the following countries are bound to implement this European Standara Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Itay, Luxembourg, Netherlands, Norwax Portugd, Spain, Sweden, Switzerland and the U
19、nited Kuigdom. This European Standard is being prepared in the following Parts : Part 1. Bending test Part 2. Impact test O BSI 1998 - STDSBSI BS EN 187b-L-ENGL 1778 m lb24bb9 0741388 LbO m Introduction The determination of the low temperature properties of rubber- or pMcsoated fabrics is important
20、for many applications. This standard describes two methods: a method by benduig that constitutes Part 1 and a method that deals with an impact on the material in the form of a loop and which constitutes Part 2. The method to be employed should be chosen by those concerned in order to match as closel
21、y as possible the conditions likely in use. The results of these two methods are not equiwient and therefore should not be compared. NOTE. Persons using this standard should be familiar with normal laboratory practice. This standard does not purport to address all of the safety problems, if any, ass
22、ociated with its use. It is the responsibility of the user to establish appropriate safety and health pracices and to ensure compliance with any national regulatory conditions. The method is technically equivaient to IS0 4675. 1 scope This standard describes a means of determining the ability of coa
23、ted fabrics to resist the effect of low temperatures when subjected to bending at specified temperatures after defined periods of exposure. It is applicable to coated fabrics that fai within the thickness range 0,lO mm to 2,20 mm. 2 Normative references This European Standard incorporates, by dated
24、or undated reference, provisions from 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 onl
25、y when incorporated in it by amendment or revision. For unated references the latest edition of the publication referred to applies. EN IS0 2231 EN 22286 3 Principle Rubber- or plastics-coated fabrics - Standard atmospheres for conditioning and testing Rubber- or plastics-coated fabrics - Detervnina
26、tion of roU chamteristics Conditioned test pieces are exposed in a cold chamber for a specified time. The test pieces are then subjected to a bend test using an appropriate apparatus and examined visuaiiy under low magxufcation. Page 3 EN 1876-1 : 1997 4 Apparatus 4.1 Cold chamber in which the test
27、pieces are exposed to low temperature, sufficient in size to contain the bending fixhire used for testing the test pieces and to permit the operation of the fixture to bend the test piece without removal from the chamber. It shall circulate cold air or any other suitable gas in such a way that a uni
28、form atmosphere at specified temperatures to within a tolerance of f 1 OC wiil be maintained. 4.2 Bending jig for bending test pieces, as shown in fgures 1 and 2. Mass tolerance and dimensions shall be as specified in figure 2. 4.3 Glass phtes of sufcient number, having dimensions of approximately 1
29、25 mm X 175 mm X 3 mm for use when conditioning al test pieces. 4.4 Ghes for handling test pieces within the cabinet and which shai be exposed to the same temperature as the test pieces. A second pair of gloves at room temperature shall be available for wearing within the cold gloves as protection f
30、or the operator. 5 Test pieces 6.1 Selection Test pieces shall be taken from an area with no functional or visible flaw and shall be located within the full length of the coated fabric and its usable width as dened in EN 22286. 6.2 Dimensions and quantity Three test pieces 25 mm X 100 mm shall be cu
31、t with the longer dimension in the longitudinal dimension of the roll. 6 Conditioning of test pieces Immediately prior to testing, condition the test pieces for at least 16 h in the appropriate atmosphere in accordance with EN IS0 2231. 7 Procedure 7.1 Place the three conditioned test pieces between
32、 glass plates (4.3) with sufficient space between each test piece to permit the passage of air during the conditioning period. Place the glass plates with the test pieces held in position, the bending jig (4.2) and the cold gloves (4.4) in the cold chamber (4.1). Unless otherwise specified, expose t
33、hem for 4 h to the specified temperature. NOTE. Longer exposure periods should be used when examining the effects of crystallization or plasticizer migration at specified test temperatures. O BSJ 1998 Page 4 EN 1876-1 : 1997 7.2 At the termination of the exposure period and while still in the chambe
34、r, remove the test pieces from between the glass plates one at a time (see note below). Within 30 s of the removal place them in the bending jig with the flexing plate held in the open position by the trigger pin. Unless otherwise specified, in the case of substmtes coated on one side only, place th
35、e coated side away from the mandrel. In the case of doublwoated fabrics either or both surfaces may be evaluated unless otherwise specified. NOTE. It is important to wear gloves at all times when handling test pieces prior to canying out the bend test. 7.3 As soon as the test piece is in position in
36、 the bending jig, release the trigger and permit the flexing plate to make a free fall. Remove the test pieces from the jig. NOTE. When materiais greater than 2,2 mm in thickness are to be tested, it may be necessary to increase the mass of the steel top bar G (see figure 2) and increase the clearan
37、ce between the back plate and the mandrel to enable the specimen to be inserted. In this case the deviation should be reported in the test report. 7.4 After all the test pieces have been tested, remove them, allow to recover to room temperature, then emmine for fractures or cracks in their coating u
38、nder a magnification factor of 4 to 6. During the e mon, fold all test pieces through 180“ in the same direction as the bend during test. 8 Assessment of damage 8.1 Examination Examine all three test pieces and where damage has occurred assess using the procedures in 8.2 to 8.4. Alternatively, the m
39、ethod may be used to determine cold bend temperature or compliance with a performance specification. If this is the case, see clause 9. 8.2 Depth of crack If there is no cracking, record nil. Grade the cracking, if anx according to the following four-part scale of increasing severity from a) to d):
40、a) Surface or finish crack not exposing any cellular, middle layer or substrate; b) Cracking intq but not through the middle layer; c) Cracking through to the substsate or base fabric; d) Cracking completely through the materiai. 8.3 Number of cracks for the three test pieces Record the number of cr
41、acks of greatest severiQ, up to 10. If there are more than 10, record over lo. 8.4 Length of crack Record the length in millimetres of the longest crack of greatest severity. 9 Interpretation of resulb Where the method is being used to determine cold bend temperature or compliance with a performance
42、 specification, it is necessary only to assess whether or not cracking has occurred at a given temperature. If all three test pieces fracture or show cracks, the material has a cold bend temperature higher (warmer) than the test temperature. The material either fails or a retest is necessary to more
43、 accurately determine the low temperature resistance to bending. If for all three test pieces, the coating remallis continuous, i.e. free from any fracture or coating cracks, the material shall be considered to either pass or have a cold bend temperature lower (colder) thCui the test temperature. If
44、 only one or two test pieces show faiiure, test three additional test pieces. If any of these test pieces shows fracture or coating cracks, the material fails at the test temperature. 10 Test report The test report shall include: a) the date of tese b) reference to this European Standard; c) the des
45、cription of the coated fabric; d) the thickness of the coating measured in accordance with EN 22286; e) the atmosphere used for conditioning before test; f) the temperature at which the test pieces were tested; g) the duraion of the exposure period (if different from 4 h); h) the surface(s) tested;
46、i) the seventy of any cracking (8.1 to 8.3) or where appropriate that the materiai was he from cracking; j) details of any deviations from this test procedure. O BSI 1998 STD-BSI ES EN 187b-1-ENGL 1778 1b24bb7 0741370 17 Page 6 EN 18761 : 1997 * rn * 1 Release 2 Test piece Figure 1. Bending jig for
47、coated fabrics O BSI 1998 Page 6 EN 1876-1 : 1997 I V I l / 1 2 3 Coated fabric test piece 4 J : Offset 5 K:Hingepin 6 L: Groove 7 Cleat 8 9 Supportbase Figure 2. Dimensions of bending jig G : Steel mass (250 * 5)g H : Aluminium bending plate (375 * 2,5)g including hinge F : Aluminium stationary ben
48、ding plate I I O BSI 1998 STD-BSI BS EN L87b-L-ENGL 1998 Lb24bb9 0743392 bL BS EN 1876-1 : 1998 BSI 389 Chiswick High Road London w4 4AL Issue 2, December 1998 BSI - British Standards Institution 3SI is the independent national body responsible for preparing British Standards. It )resents the UK vie
49、w on standards in Europe and at the international level. It is ncorporated by Royal Charter. Levisions 3ritjsh Standards are updated by amendment or revision. Users of British Standards ;houid make sure that they posses the latest amendments or eitions. t is the constant aim of BSI to improve the quality of our products and services. We would be grakfui if anyone nnduig an inaccuracy or ambmty while using this 3ritish Standard would inform the Secretary of the technical committee responsible, he identity of which can
