1、STD-BSI BS EN 12332-1-ENGL 1797 Lb29bb7 0750344 74T BRITISH STANDARD Rubber- or plastics-coated fabrics - Determination of bursting strength - Part 1: Steel ball method The European Standard EN 12332-1: 1998 has the status of a British Standard ICs 59.080.40 BS EN 12332-k1999 NO COPYING WITHOUT BSI
2、PERMISSION EXCEPT AS PERMITTED BY COPYRIGHI LAW STD-BSI BS EN 12332-L-ENGL 1999 = lbZVbb7 0750345 88b been prepared under the Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 February 1999 direction of the Sector Amd. No.
3、 Q BSI 02-1999 ISBN O 580 30370 5 BS EN 12332-11999 Date Text affected National foreword This British Standard is the English hguage version of EN 12332-1: 1998. It supersedes method SA of BS 3424-6: 1982, which is withdrawn by amendment. On eventual publication of BS EN 12332-2, BS 342461982 wiil b
4、e withdrawn in its entirety. The UK participation in its preparation was entrusted to Technical Committee TCI78, Coated fabrics, which has the responsibiiity to: - aid enquirers to understand the text, - present to the responsible European committee any enquiries on the - monitor related internatiow
5、d and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed; 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 internatio
6、nal 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 using the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include a
7、ll 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 pages This document comprises a front cover, an inside front cover, the EN tit
8、le page, pages 2 to 5 and a back cover. STD.BSI BS EN 12332-1-ENGL 1997 = LbZLIbbS 075034b 7L2 M EUROPEAN STWARD EN 12332.1 NORME EUROP 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
9、 system and the relative resolution of the force indicator shall conform to the maximum permissible values for a Class 1 machine as specified in IS0 7500-1; d) an autographic recorder. 4.2 Bursting attachment (see Figure 1). The test specimen is held securely by a ring mechanism of internal diameter
10、 (45 f 0,5) mm, when the 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 hit of the surface roughness parameter Ra of 0,4 km (roughness grade number N5) as described in IS0 1302. The direction of motion of the
11、ring clamp or steel ball shall be at right angles to the plane of the fabric. The clamping suraces 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 m
12、m deep. The grooves start no further than 3 nun 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 “bst specimens 6.1 Preparation of test specimens Cut six test specimens with a diameter of
13、 not less than 65 mm, in a diagonal arrangement across the full usable width of the coated fabric, in accordance with EN IS0 2286 (see Figure 2). 6.2 Conditioning Precondition the test specimens in accordance with EN IS0 2231, but do not expose specimens to a temperature above 50 OC. Condition the t
14、est specimens for at least 24 h in one of the standard atmospheres for testing coated fabrics according to EN IS0 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,
15、 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 Procedure Secure the test specimen in the ring clamp such that the
16、 coated side of the fabric faces away from the steel ball, and apply a pretension load of (5,O * 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,O f 0,5) mm/s until the test specimen fails. NOTE For fabrics co
17、ated on both faces, an agreement on the face 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 authoriv should be especially asked to test the material with the
18、 uncoated surface outside, and this deviation should be noted in the report. 7 Assessment of failure Ignore 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
19、another test specimen. NOTE Slippage is normally evident as blurring of the marks left by the ring clamp on the test specimen. O BSI 02-1999 STD-BSI BS EN 12332-1-ENGL 1999 lb2Libb7 0750349 Li21 Page 4 EN 12332-1:1998 Many tensile machines automatidly record the maximum force reached during a test a
20、nd the distension at this point. However, certain types of coated fabrics are known to fail progressively with a number of peak forces mtil the fabric is completeiy penetrated. In such cases the rst peak recorded shail be regarded as the faiiure point of the fabric. The first peak is not necessarily
21、 the maximum force recorded during a test and can only be determined fi-om an autographic recording of force against distension. Tensile testing machines which are capable of automatidly recording zero-slope yield points may detect low first peaks, but it is recommended that an autographic recording
22、 is obtained for all tests. 8 Calculation and expression of results For each test, record the force in newtons required to cause the hilure of the test specimen, to the nearest newton. Calculate the arithmetic mean of the six resuits obtained. For each test, record the displacement of the steel ball
23、 required to cause the failure of the test specimen, in milhetres, to the nearest 0,l mm. Calculate the arithmetic mean of the six results obtained. AU dimensions are in millimetres R0,5 -/ n /i I 1 Upperciamp 2 Testspecimen 3 Lowerclamp 4 Steelball Figure 1- Apparatus O BSI 02-1999 Page 5 EN 12332-
24、1:1998 9 Bst report The test report shall include the following particulars: a) reference to this European Standard b) a simple designation of the tested matenal, e) the conditioning atmosphere used, or whether the specimens were tested in the wet state; d) the date of test; e) the number of specime
25、ns 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. U
26、sable width c o Figure 2 - Recommended positions of test specimens O BSI 02-1999 STD-BSI BS EN L2332-1-ENGL 1999 I lb2LibbS 07503511 OBT BS EN 12332-1:1999 BSI 389 Chiswick High Road London w4 4AL BSI - British Standards Institution BSI is the independent national body responsible for preparing Brit
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