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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1876-1 : 1998 Incor
2、porating Amendment No. 1 The European Standard EN 1876-1 : 1997 has the status of a British Standard ICS 59.080.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Rubber- or plastics-coated fabrics Low temperature tests Part 1. Bending test This British Standard, having been p
3、repared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 February 1998 BSI 1998 ISBN 0 580 29454 4 BS EN 1876-1 : 1998Issue 2, December 1998 Amendments issued since publication Amd. No.Da
4、teText affected 10219December 1998 Second paragraph of National foreword replaced | | | | | | National foreword This British Standard is the English language version of EN 1876-1 : 1997 published by the European Committee for Standardization (CEN). It supersedes method 10B of BS 3424 : Part 8 : 1983
5、. BS EN 1876-2 : 1998 (Impact test on loop) provides an additional low temperature test. This British Standard is technically equivalent to ISO 4675. The UK participation in its preparation was entrusted to Technical Committee TCI/78, Coated fabrics, which has the responsibility to: aid enquirers to
6、 understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this com
7、mittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by us
8、ing the Find facility 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. Compliance with a British Standard does not of itself confer immunity
9、from legal obligations. Issue 1, December 1998BS EN 1876-1 : 1998 BSI 1998a Summary of pages The following table identifies the current issue of each page. Issue 1 indicates that a page has been introduced for the first time by amendment. Subsequent issue numbers indicate an updated page. Vertical s
10、idelining on replacement pages indicates the most recent changes (amendment, addition, deletion). PageIssuePageIssue Front cover Inside front cover a b EN title page 2 2 2 1 blank original original 3 4 5 6 Inside back cover Back cover original original original original blank 2 bblank CEN European C
11、ommittee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1876-1 : 1997 E EUROPEA
12、N STANDARDEN 1876-1 NORME EUROPE ENNE EUROPA ISCHE NORM October 1997 ICS 59.080.40 Descriptors: Textiles, coated fabrics, fabrics coated with rubber, fabrics coated with plastics, tests, low temperature tests, bend tests English version Rubber- or plastics-coated fabrics Low-temperature tests Part1:
13、 Bending test Supports textiles reve tus de caoutchouc ou de plastique Essais a basse tempe rature Partie 1: Essai de pliage Mit Kautschuk oder Kunststoff beschichtete Textilien Pru fungen bei niedrigen Temperaturen Teil 1: Biegeversuch This European Standard was approved by CEN on 26 September 1997
14、. 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 national standards may be obtained on
15、 application to the Central Secretariat 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 and notified to the Central Secretariat
16、 has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Page 2 EN 18
17、76-1 : 1997 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 248 Textiles and textile products, the secretariat of which 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 e
18、ndorsement, at the latest by April 1998, and conflicting national standards shall be withdrawn at the latest by April 1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgi
19、um, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. This European Standard is being prepared in the following Parts : Part 1.Bending test Part 2.Impact test Page 3 EN 187
20、6-1 : 1997 BSI 1998 Introduction The determination of the low temperature properties of rubber- or plastics-coated fabrics is important for many applications. This standard describes two methods: a method by bending that constitutes Part 1 and a method that deals with an impact on the material in th
21、e 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 closely as possible the conditions likely in use. The results of these two methods are not equivalent and therefore should not be compared. NOTE. Persons using this stand
22、ard should be familiar with normal laboratory practice. This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulato
23、ry conditions. The method is technically equivalent to ISO 4675. 1 Scope This standard describes a means of determining the ability of coated fabrics to resist the effect of low temperatures when subjected to bending at specified temperatures after defined periods of exposure. It is applicable to co
24、ated fabrics that fall within the thickness range 0,10 mm to 2,20 mm. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are lis
25、ted hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN ISO 2231Rubber- or plast
26、ics-coated fabrics Standard atmospheres for conditioning and testing EN 22286Rubber- or plastics-coated fabrics Determination of roll characteristics 3 Principle 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 app
27、ropriate apparatus and examined visually under low magnification. 4 Apparatus 4.1 Cold chamber in which the test pieces are exposed to low temperature, sufficient in size to contain the bending fixture used for testing the test pieces and to permit the operation of the fixture to bend the test piece
28、 without removal from the chamber. It shall circulate cold air or any other suitable gas in such a way that a uniform atmosphere at specified temperatures to within a tolerance of1 8C will be maintained. 4.2 Bending jig for bending test pieces, as shown in figures 1 and 2. Mass tolerance and dimensi
29、ons shall be as specified in figure 2. 4.3 Glass plates of sufficient number, having dimensions of approximately 125 mm 3 175 mm 3 3 mm for use when conditioning all test pieces. 4.4 Gloves for handling test pieces within the cabinet and which shall be exposed to the same temperature as the test pie
30、ces. A second pair of gloves at room temperature shall be available for wearing within the cold gloves as protection for the operator. 5 Test pieces 5.1 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 fabr
31、ic and its usable width as defined in EN 22286. 5.2 Dimensions and quantity Three test pieces 25 mm 3 100 mm shall be cut 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 th
32、e appropriate atmosphere in accordance with EN ISO 2231. 7 Procedure 7.1 Place the three conditioned test pieces between 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 p
33、osition, the bending jig (4.2) and the cold gloves (4.4) in the cold chamber (4.1). Unless otherwise specified, expose them 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 temp
34、eratures. Page 4 EN 1876-1 : 1997 BSI 1998 7.2 At the termination of the exposure period and while still in the chamber, 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 op
35、en position by the trigger pin. Unless otherwise specified, in the case of substrates coated on one side only, place the coated side away from the mandrel. In the case of double-coated fabrics either or both surfaces may be evaluated unless otherwise specified. NOTE. It is important to wear gloves a
36、t all times when handling test pieces prior to carrying out the bend test. 7.3 As soon as the test piece is in position in 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 materials greater than 2,2 mm in thickness
37、 are to be tested, it may be necessary to increase the mass of the steel top bar G (see figure 2) and increase the clearance 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 h
38、ave been tested, remove them, allow to recover to room temperature, then examine for fractures or cracks in their coating under a magnification factor of 4 to 6. During the examination, fold all test pieces through 1808 in the same direction as the bend during test. 8 Assessment of damage 8.1 Examin
39、ation Examine all three test pieces and where damage has occurred assess using the procedures in 8.2 to 8.4. Alternatively, the method 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 c
40、racking, record nil. Grade the cracking, if any, according to the following four-part scale of increasing severity from a) to d): a) Surface or finish crack not exposing any cellular, middle layer or substrate; b) Cracking into, but not through the middle layer; c) Cracking through to the substrate
41、or base fabric; d) Cracking completely through the material. 8.3 Number of cracks for the three test pieces Record the number of cracks of greatest severity, up to 10. If there are more than 10, record over 10. 8.4 Length of crack Record the length in millimetres of the longest crack of greatest sev
42、erity. 9 Interpretation of results Where the method is being used to determine cold bend temperature or compliance with a performance 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 mater
43、ial has a cold bend temperature higher (warmer) than the test temperature. The material either fails or a re-test is necessary to more accurately determine the low temperature resistance to bending. If for all three test pieces, the coating remains continuous, i.e. free from any fracture or coating
44、cracks, the material shall be considered to either pass or have a cold bend temperature lower (colder) than the test temperature. If only one or two test pieces show failure, test three additional test pieces. If any of these test pieces shows fracture or coating cracks, the material fails at the te
45、st temperature. 10 Test report The test report shall include: a) the date of test; b) reference to this European Standard; c) the description 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 temper
46、ature at which the test pieces were tested; g) the duration of the exposure period (if different from 4 h); h) the surface(s) tested; i) the severity of any cracking (8.1 to 8.3) or where appropriate that the material was free from cracking; j) details of any deviations from this test procedure. Pag
47、e 5 EN 1876-1 : 1997 BSI 1998 1Release 2Test piece Figure 1. Bending jig for coated fabrics Page 6 EN 1876-1 : 1997 BSI 1998 1G : Steel mass (2505)g 2H : Aluminium bending plate (3752,5)g including hinge 3Coated fabric test piece 4J : Offset 5K : Hinge pin 6L : Groove 7Cleat 8F : Aluminium stationar
48、y bending plate 9Support base Figure 2. Dimensions of bending jig blank BSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
49、 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and servi