1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1876-2 : 1998 The E
2、uropean Standard EN 1876-2 : 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 2. Impact test on loopThis British Standard, having been prepared under the direct
3、ion of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 March 1998 BSI 1998 ISBN 0 580 29275 4 BS EN 1876-2 : 1998 Amendments issued since publication Amd. No. Date Text affected National foreword This British Standard
4、 is the English language version of EN 1876-2 : 1997. It is an additional method to methods 10A and 10C of BS 3424 : Part 8 : 1983. Method 10B (low temperature bend test) of BS 3424 : Part 8 : 1983 is superseded by BS EN 1876-1. The UK participation in its preparation was entrusted to Technical Comm
5、ittee TCI/78, Coated fabrics, which has the responsibility to: aid enquirers to 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
6、 and promulgate 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 international or European publications referred to in this document may be found in the BSI Standards Catalogue un
7、der the section entitled International Standards Correspondence Index, or by using 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 appl
8、ication. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 6, an inside back cover and a back cover.CEN European Committee for Standardization Comi
9、te 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 1876-2 : 1997 E EUROPEAN STANDARD EN 1876-2 NORME EUROPE
10、 ENNE EUROPA ISCHE NORM November 1997 ICS 59.080.40 Descriptors: Textiles, coated fabrics, fabrics coated with rubber, fabrics coated with plastics, thermal tests, low temperature tests, thermal shock tests, brittleness, limit temperature of brittleness, bend tests English version Rubber- or plastic
11、s-coated fabrics Low temperature tests Part 2: Impact test on loop Supports textiles reve tus de caoutchouc ou de plastique Essais a basse tempe rature Partie 2: Essai de choc sur boucle Mit Kautschuk oder Kunstoff beschichtete Textilien Pru fungen bei niedrigen Temperaturen Teil 2: Schlaufen-Schlag
12、pru fung This European Standard was approved by CEN on 16 October 1997. 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 bibliograp
13、hical references concerning such national standards may be obtained on 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 CE
14、N 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, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
15、 Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 1876-2 : 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
16、 national standard, either by publication of an identical text or by endorsement, at the latest by May 1998, and conflicting national standards shall be withdrawn at the latest by May 1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following count
17、ries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. EN 1876 deals with low temperature properties of coa
18、ted fabrics and is composed of two parts: Part 1: Bending test Part 2: Impact test on loop Annex A is informative and gives examples of suitable apparatus. NOTE. Persons using this standard should be familiar with normal laboratory practice. This standard does not purport to address all of the safet
19、y 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 regulatory conditions.Page 3 EN 1876-2 : 1997 BSI 1998 Introduction The determination of the low temperature properties of
20、 rubber or plastic coated fabrics is important for many applications. EN 1876 describes two methods: a method by bending that constitutes part 1, and a method that deals with an impact on the material in a loop, and which constitutes part 2. The cold crack temperature is not a sharply defined temper
21、ature. This temperature depends on the stressed state of the fabric and also the rate of any impact on the loop. This method permits the determination of the temperature limit of brittleness. The method to be employed should be chosen by those concerned in order to ensure it matches as closely as po
22、ssible the conditions likely in use. The results of these two methods are not equivalent and therefore should not be compared. 1 Scope This European Standard specifies a method for the determination of low temperature properties of coated fabrics. This method is only considered suitable for material
23、s which can, at room temperature, be easily bent into the configuration required by the test without damage to the specimen, determined by a test carried out at room temperature. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publicati
24、ons. 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 only when incorporated in it by amendment or revision. F
25、or undated references the latest edition of the publication referred to applies. EN ISO 2231 Rubber or plastics coated fabrics Standard atmospheres for conditioning and testing EN 22286 Rubber or plastics coated fabrics Determination of roll characteristics 3 Definition For the purposes of this stan
26、dard, the following definition applies: 3.1 temperature limit of brittleness Lowest temperature at which at most one specimen in 20 breaks under the conditions of the test. 4 Principle Rectangular test specimens, bent in the form of a loop and placed in a low temperature chamber, are quickly folded
27、by means of an impact caused by a freely falling hammer. Tests are continued at decreasing temperatures from a multiple of 5 by steps of 5 C until more than one break is observed. 5 Sampling From each laboratory sample, two sets of test specimens shall be cut, one set in the longitudinal direction a
28、nd the other set in the transverse direction. The test specimens shall be selected within the full length of the coated fabric and its usable width, as defined in EN 22286. The test specimens shall be (15 0,5) mm wide and (60 1) mm long. For each test temperature, at least 10 test specimens shall be
29、 tested (five being in the longitudinal direction and five in the transverse direction). 6 Apparatus 6.1 Impact apparatus, having the following general characteristics: a test specimen holder permitting clamping of one or several test specimens over the whole width; an anvil capable of being attache
30、d to the specimen holder and withstanding impact without deformation during the test. The anvil and the test specimen holder shall be level; a hammer of mass (200 2) g made of a vertical axis cylinder, its diameter being between 17 mm and 30 mm. The base of the cylinder shall be chamfered to an angl
31、e of (45 1)8; the chamfered edge being (1 0,1) mm high; a centering system for the hammer equipped with a holding down system to permit a free fall of the hammer from a height of (200 2) mm. Two examples of suitable impact apparatus are given in annex A. 6.2 Cold chamber, containing the impact appar
32、atus, which shall permit a decrease of temperature by steps of 58C. The temperature of the chamber shall be stabilized to 1 8C adjacent to the test specimen. 6.3 Lens, with a magnification of34t o3 6. 7 Atmospheres for conditioning The atmospheres for conditioning shall be as specified in EN ISO 223
33、1. NOTE. The samples should be conditioned for at least 24 h in a free state.Page 4 EN 1876-2 : 1997 BSI 1998 1 Base fabric 2 Intermediate layer 3 Upper layer Figure 1. Chap Figure 2. Fissure Figure 3. Crack 8 Procedure Bend the ends of test specimen to form a loop and clamp on the test specimen hol
34、der. Introduce the test specimen holder into the cold chamber (see 6.2). After (120 15) min, when the test specimens are in equilibrium with the test temperature, drop the hammer (see 6.1) onto the test specimens. Take the test specimens out of the cold chamber and examine them with the lens (see 6.
35、3). A test specimen is considered broken when it shows a rupture visible with a lens, induced totally or partially over the thickness of the coating (fissures, cracks), and not a surface deformation such as a white line or a chap. The initial test temperature shall be such that no break occurs. Unle
36、ss otherwise agreed by the parties, it shall be a multiple of 5 C. At any test temperature (t), perform the test as follows: test 10 test specimens and check them for breaks; If two or more breaks occur, then the test is ended and the temperature (t f ) is noted; If one test specimen only breaks, th
37、en re-test a new set of 10 specimens. If one or more breaks of this new set occur, then the test is ended and the temperature (t f ) is noted; otherwise, lower the temperature of the chamber by 5 C . Resume the test at this new temperature(t); If no break occurs, then lower the temperature of the ch
38、amber by 5 C. Resume the test at this new temperature as (t). 9 Expression of results The temperature limit of brittleness (t b ) is expressed by t b = t f +5 where t f is the temperature noted at the end of the test; t b and t f are expressed in C. 10 Test report The test report shall include the f
39、ollowing particulars: a) reference to this standard; b) date of test; c) identification of sample and sampling procedure, if required; d) the temperature limit of brittleness specified in clause 9 and the type of damage observed on the sample; e) any deviation from the procedure. NOTE. Coated fabric
40、s are generally anisotropic materials and frequently this test is ended because of breaking of the test specimens in one direction only, either longitudinal or transverse. In this case, it is recommended to indicate this direction in the test report.Page 5 EN 1876-2 : 1997 BSI 1998 1 Hammer 2 Center
41、ing tube 3 Test specimen 4 Grip 5 Specimen holder Figure A.1 Impact apparatus, with a series of several centering tubes assembled Annex A (informative) Examples of impact apparatusPage 6 EN 1876-2 : 1997 BSI 1998 1 Hammer 2 Centering means 3 Support means 4 Grip 5 Test specimen 6 Eight-sided holder
42、Figure A.2 Impact apparatus with eight-sided holderblankBSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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