豆丁网：BRITISH STANDARDRubber- or plastics-coated fabrics Ð Determination of bursting strength ÐPart 1: Steel ball methodThe European Standard EN 12332-1:1998 has the status of aBritish StandardICS 59.080.40| BS EN12332-1:1999|||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 16:00:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI|||||||||NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 12332-1:1999National forewordThis British Standard is the English language version of EN 12332-1:1998. It supersedes method 8A of BS 3424-6:1982, which is withdrawn by amendment. On eventual publication of BS EN 12332-2, BS 3424-6:1982 will be withdrawn in its entirety.The UK participation in its preparation was entrusted to Technical CommitteeTCI/78, Coated fabrics, which has the responsibility to:Ð aid enquirers to understand the text;Ð present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;Ð monitor related international and European developments and promulgate them in the UK.A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe 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 ªInternational Standards Correspondence Indexº, or by using theªFindº 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 from legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 5 and a back cover.Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 16:00:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSIAmd. No.DateText affectedThis British Standard, having been prepared under the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the StandardsCommittee and comes into effect on 15 February 1999BSI 02-1999ISBN 0 580 30370 5Amendments issued since publicationEUROPEAN STANDARD EN 12332-1NORME EUROPE ENNEEUROPAÈ ISCHE NORM July 1998ICS 59.080.40Descriptors: textiles, coated fabrics, fabrics coated with rubber, fabrics coated with plastics, burst tests, determination, bursting strengthEnglish versionRubber- or plastics-coated fabrics Ð Determination of bursting strength Ð Part 1: Steel ball methodSupports textiles reveà tus de caoutchouc ou de plastique Ð De termination de la re sistance aÁl'e clatement Ð Partie 1: Me thode aÁ la billeMit Kautschuk oder Kunststoff beschichtete Textilien Ð Bestimmung der Berstfestigkeit Ð Teil 1: StahlkugelverfahrenLicensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 16:00:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSIThis European Standard was approved by CEN on 21 June 1998.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 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 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.CENEuropean Committee for Standardization Comite Europe en de Normalisation EuropaÈ isches Komitee fuÈ r NormungCentral Secretariat: rue de Stassart 36, B-1050 Brussels1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN nationalMembers.Ref. No. EN 12332-1:1998 EPage 5EN 12332-1:1998Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 16:00:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSIForewordThis 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 endorsement, at the latest by January 1999, and conflicting national standards shall be withdrawn at the latest by January 1999.EN 12332 deals with the determination of the bursting strength of coated fabrics. It consists of two parts:Part 1: Steel ball methodPart 2: Hydraulic methodNOTE 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, 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.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries 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.BSI 02-1999Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 16:00:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI1 ScopeThis part of EN 12332 describes a method for determining the bursting strength of coated fabrics using a mechanically operated steel ball.2 Normative referencesThis 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 listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated by amendment or revision. Forundated references the latest edition of the publication referred to applies.EN ISO 2231, Rubber- or plastics-coated fabrics Ð Standard atmospheres for conditioning and testing.EN ISO 2286, Rubber- or plastics-coated fabrics Ð Determination of roll characteristics.ISO 1302, Technical drawings Ð Method of indicating surface texture.ISO 7500-1, Metallic materials Ð Verification of static uniaxial testing machines Ð Part 1: Tensile testing machines.3 PrincipleA coated fabric is securely clamped between rigid coaxial apertures. A polished steel ball, traversing at a fixed speed, is pressed against the coated fabric specimen until failure occurs. The force required to cause failure and the displacement of the polished steel ball at failure are recorded.4 Apparatus4.1 Constant rate of extension (CRE) tensile testing machine, having the following characteristics:a) a traverse speed of (5,0 0,5) mm/s;b) a force range such that the failure force of the fabric under test will be between 10 % and 90 % of the upper force limit;c) the accuracy of the force-measuring system and the relative resolution of the force indicator shall conform to the maximum permissible values for a Class 1 machine as specified in ISO 7500-1;d) an autographic recorder.4.2 Bursting attachment (see Figure 1). The test specimen is held securely by a ringmechanism of internal diameter (45 0,5) mm, whenthe centre of the test specimen is pressed against a polished steel ball of diameter (38 0,02) mm. The surface of the steel ball has an upper limit of the surface roughness parameter Ra of 0,4 mm (roughness grade number N5) as described in ISO 1302. The direction of motion of the ring clamp or steel ball shallbe at right angles to the plane of the fabric.The clamping surfaces of the upper and lower clamps are grooved concentrically so that the crowns of the grooves of one plate fit the grooves of the other. The grooves are not less than 0,3 mm apart and not less than 0,15 mm deep. The grooves start no furtherthan 3 mm from the edge of the aperture and are rounded to a radius of not greater than 0,4 mm. The lower inner edge of the lower clamp is rounded to a radius of 0,5 mm.5 Test specimens5.1 Preparation of test specimensCut six test specimens with a diameter of not less than 65 mm, in a diagonal arrangement across the full usable width of the coated fabric, in accordance with EN ISO 2286 (see Figure 2).5.2 ConditioningPrecondition the test specimens in accordance with EN ISO 2231, but do not expose specimens to a temperature above 50 8C. Condition the test specimens for at least 24 h in one of the standard atmospheres for testing coated fabrics according to EN ISO 2231, ensuring exposure of all the surfaces to the air by, for example, placing the test specimens on wire gauze or mesh.When it is required to determine the properties of wet material, immerse each previously cut test specimen in distilled or deionized water and place under vacuum for 10 min. Immediately after removal from the water, blot each test specimen between two sheets of absorbent paper and test at once.6 ProcedureSecure the test specimen in the ring clamp such that the coated side of the fabric faces away from the steel ball, and apply a pre-tension load of (5,0 0,5) N to the test specimen. Engage the autographic recorder and move the test specimen and steel ball towards each other at a speed of (5,0 0,5) mm/s until the test specimen fails.NOTE For fabrics coated on both faces, an agreement on theface to be tested should be achieved; otherwise it is recommended to test both faces and indicate this deviation in the test report. If the uncoated face is the external face in use, the testing authority should be especially asked to test the material with the uncoated surface outside, and this deviation should be noted in the report.7 Assessment of failureIgnore any failure that is confined to the edge of the clamp, and repeat the test on another test specimen.Ignore any test results where the test specimen slips in the clamp, and repeat the test on another test specimen.NOTE Slippage is normally evident as blurring of the marks left by the ring clamp on the test specimen.Many tensile machines automatically record the maximum force reached during a test and the distension at this point. However, certain types of coated fabrics are known to fail progressively with a number of peak forces until the fabric is completely penetrated. In such cases the first peak recorded shall be regarded as the failure point of the fabric. The first peak is not necessarily the maximum force recorded during a test and can only be determined from an autographic recording of force against distension. Tensile testing machines which are capable of automatically recording zero-slope yield points may detect low first peaks, but it is recommended that an autographic recording is obtained for all tests.8 Calculation and expression of resultsFor each test, record the force in newtons required to cause the failure of the test specimen, to the nearest newton.Calculate the arithmetic mean of the six results obtained.For each test, record the displacement of the steel ball required to cause the failure of the test specimen, in millimetres, to the nearest 0,1 mm.Calculate the arithmetic mean of the six results obtained.All dimensions are in millimetres45 ± 0,50R 0,512R 0,534Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 16:00:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI1 Upper clamp2 Test specimen3 Lower clamp4 Steel ballFigure 1 Ð ApparatusLicensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 16:00:06 GMT+00:00 2006, Uncontrolled Copy, (c) BSI9 Test reportThe test report shall include the following particulars:a) reference to this European Standard;b) a simple designation of the tested material;c) the conditioning atmosphere used, or whether the specimens were tested in the wet state;d) the date of test;e) the number of specimens evaluated;f) the bursting strength in newtons as the mean of the six results obtained;g) the bursting distension in millimetres as the mean of the six results obtained;h) the standard deviation and confidence interval, if required;i) details of any deviations from the standard test procedure.Usable width654321Figure 2 Ð Recommended positions of test specimensBSI389 Chiswick High RoadLondonW4 4AL||||||||| BSI Ð British Standards Institution||||||| BSI is the independent national body responsible for preparing British Standards. 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