1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 3303-2:2012Rubber- or plastics-coatedfabrics Determination ofbursting strengthPart 2: Hydraulic methodBS ISO 3303-2:2012 BRITISH STANDARDNational forewordThis British Stan
2、dard is the UK implementation of ISO 3303-2:2012.The UK participation in its preparation was entrusted to TechnicalCommittee TCI/69, Footwear, leather and coated fabrics.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport
3、 to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 76966 5ICS 59.080.40Compliance with a British Standard cannot confer immunity fromlegal obligations.Th
4、is British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 September 2012.Amendments issued since publicationDate Text affectedBS ISO 3303-2:2012 ISO 2012Rubber- or plastics-coated fabrics Determination of bursting strength Part 2: Hydraulic methodSuppo
5、rts textiles revtus de caoutchouc ou de plastique Dtermination de la rsistance lclatement Partie 2: Mthode hydrauliqueINTERNATIONAL STANDARDISO3303-2First edition2012-08-15Reference numberISO 3303-2:2012(E)BS ISO 3303-2:2012ISO 3303-2:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMEN
6、T ISO 2012All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in
7、the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 3303-2:2012ISO 3303-2:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scop
8、e 12 Normative references . 13 Principle . 14 Apparatus 15 Calibration . 46 Sampling 47 Preparation of test pieces . 48 Time-interval between manufacture and testing 49 Conditioning of test pieces . 410 Procedure 511 Test report . 5Bibliography . 6BS ISO 3303-2:2012ISO 3303-2:2012(E)ForewordISO (the
9、 International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committe
10、e has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechni
11、cal standardization.International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bod
12、ies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any
13、or all such patent rights.ISO 3303-2 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 4, Products other than hoses.Together with Part 1, it cancels and replaces ISO 3303:1990, which has been split into two parts and technically revised.ISO 3303 consists of t
14、he following parts, under the general title Rubber- or plastic-coated fabrics Determination of bursting strength: Part 1: Steel-ball method Part 2: Hydraulic methodiv ISO 2012 All rights reservedBS ISO 3303-2:2012ISO 3303-2:2012(E)IntroductionThe bursting strength of coated fabrics is often used as
15、a measure of the multidirectional modulus of the material, as opposed to tensile properties which only provide guidance to the coated-fabric strength in one plane. In addition, bursting strength is more appropriate for testing materials prone to necking, such as coated fabrics with knitted substrate
16、s.The method described in this part of ISO 3303, which employs an elastic diaphragm, is the more common method used in burst testing and is more suitable for the testing of lighter and medium-weight coated fabrics. Two aperture sizes are specified to allow the use of commercially available instrumen
17、ts, although results from the different machines might not be comparable ISO 2012 All rights reserved vBS ISO 3303-2:2012BS ISO 3303-2:2012Rubber- or plastics-coated fabrics Determination of bursting strength Part 2: Hydraulic method1 ScopeThis part of ISO 3303 specifies a method for the determinati
18、on of the bursting strength of rubber- or plastics-coated fabrics, using one of two types of diaphragm bursting tester, designated type A and B, both operated by hydraulic pressure. The type A test machine is applicable to materials having bursting strengths ranging from 350 kPa to 5 500 kPa and the
19、 type B test machine is applicable to materials of bursting strengths ranging from 70 kPa to 1 400 kPa.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the la
20、test edition of the referenced document (including any amendments) applies.ISO 2231, Rubber- or plastics-coated fabrics Standard atmospheres for conditioning and testing3 PrincipleA test piece is securely clamped around its edges between an upper and lower clamp. A diaphragm fitted beneath the lower
21、 clamp is gradually stretched into a dome by forcing fluid at a constant rate into a chamber under the diaphragm, thus causing it to make contact with, and apply pressure to, the test piece. The pressure of the fluid and the height of the dome at failure of the test piece are recorded.4 Apparatus4.1
22、 Test machine1), of type A (see 4.1.1) or type B (see 4.1.2). In the case of materials for which the bursting-strength specification allows either type of test machine to be used, it is recommended that the customer and supplier mutually agree upon the test machine to be employed, as the test result
23、 from one type of test machine is not necessarily comparable with that from the other type.4.1.1 Type A test machine (see Figure 1), measurement range between 350 kPa and 5 500 kPa, comprising the elements specified in 4.1.1.1 to 4.1.1.3.4.1.1.1 Clamping system, for clamping the test piece firmly an
24、d with uniform loading between two plane, parallel, annular surfaces which are smooth (but not polished) and include grooves as shown in Figure 1, which also specifies the dimensions of the clamping system. One clamping plate is held in a swivel joint or similar device so as to ensure that the clamp
25、ing pressure is distributed evenly. Under the load used for testing, the circular openings in the two clamping faces shall be concentric to within 0,25 mm and the clamping surfaces shall be flat and parallel.4.1.1.2 Diaphragm, circular in shape, made of natural or synthetic rubber clamped securely,
26、before the test begins, with its upper surface recessed about 5,5 mm relative to the upper surface of the lower clamp The 1) Test machines of this type are often called Mullen burst testers. Such a tester is described in detail in ISO 2759.INTERNATIONAL STANDARD ISO 3303-2:2012(E) ISO 2012 All right
27、s reserved 1BS ISO 3303-2:2012ISO 3303-2:2012(E)material and construction of the diaphragm shall be such that the pressure required to cause the diaphragm to bulge beyond the upper surface of the lower clamp is as follows: bulge height 10 mm 0,2 mm, pressure range: 170 kPa to 220 kPa; bulge height 1
28、8 mm 0,2 mm, pressure range: 250 kPa to 350 kPa.Diaphragms in use shall be regularly checked and changed should the bulge-height requirement be no longer met.4.1.1.3 Hydraulic system, to apply an increasing hydraulic pressure to the inside of the diaphragm until the test piece bursts. The pressure s
29、hall be generated by a motor-driven piston forcing a suitable liquid (e.g. pure glycerol, low-viscosity silicone oil or ethylene glycol containing corrosion inhibitor) which is compatible with the diaphragm material against the inner surface of the diaphragm. The hydraulic system and the fluid used
30、shall be free from air bubbles. The pumping rate shall be 170 ml/min 20 ml/min.Dimensions in millimetresKey1 continuous-spiral 60 V-groove or series of concentric 60 V-grooves2 upper clamp3 test piece4 lower clamp5 rubber diaphragm6 pressure chamberaIn EN 12332-2, the diameter of the cylindrical bor
31、e through the upper and lower clamps is 35,7 mm, giving a clamped area of 10 cm2.Figure 1 Type A test machine2 ISO 2012 All rights reservedBS ISO 3303-2:2012ISO 3303-2:2012(E)4.1.2 Type B test machine (see Figure 2), measurement range between 70 kPa and 1 400 kPa, comprising the elements specified i
32、n 4.1.2.1 to 4.1.2.3.4.1.2.1 Clamping system, for clamping the test piece firmly and uniformly between two annular, plane, parallel surfaces which shall be smooth (but not polished) and grooved as described in Figure 2, which also gives the dimensions of the clamping system. One clamping plate shall
33、 be held in a swivel joint or similar device so as to ensure that the clamping pressure is distributed evenly. Under the load used for testing, the circular openings in the two clamping faces shall be concentric to within 0,25 mm and the clamping surfaces shall be flat and parallel.4.1.2.2 Diaphragm
34、, circular in shape, made of natural or synthetic rubber and 0,86 mm 0,06 mm thick, clamped securely, before the test begins, with its upper surface recessed about 3,5 mm relative to the upper surface of the lower clamp. The material and construction of the diaphragm shall be such that the pressure
35、required to cause the diaphragm to bulge 9,0 mm 0,2 mm beyond the upper surface of the lower clamp is 30 kPa 5 kPa.Diaphragms in use shall be regularly checked and changed should the bulge-height requirement be no longer met.Dimensions in millimetresKey1 continuous-spiral 60 V-groove or series of co
36、ncentric 60 V-grooves2 upper clamp3 test piece4 lower clamp5 rubber diaphragm6 pressure chamberaThe dimensions given in brackets are those of alternative test machines available commercially (see the introduction, second paragraph).Figure 2 Type B test machine ISO 2012 All rights reserved 3BS ISO 33
37、03-2:2012ISO 3303-2:2012(E)4.1.2.3 Hydraulic system, to apply an increasing hydraulic pressure to the inside of the diaphragm until the test piece bursts. The pressure shall be generated by a motor-driven piston forcing a suitable liquid (e.g. pure glycerol, low-viscosity silicone oil or ethylene gl
38、ycol containing corrosion inhibitor) which is compatible with the diaphragm material against the inner surface of the diaphragm. The hydraulic system and the fluid used shall be free from air bubbles. The pumping rate shall be 95 ml/min 5 ml/min.4.2 Pressure-measuring system to measure bursting stre
39、ngth, giving a rate of response to the rising hydraulic pressure which is such that the indicated maximum pressure is within 3 % of the true peak pressure.5 CalibrationCalibration shall be carried out in accordance with the test machine manufacturers manual before initial use and subsequently at suf
40、ficiently frequent intervals to maintain the specified accuracy.6 SamplingThe sample shall be taken so that it is as representative as possible of the whole consignment.7 Preparation of test pieces7.1 Take five test pieces across the usable width of the sample (see the note), at least 1 m from the e
41、xtremity of the sample, and of sufficient size so that each test piece can be clamped firmly in the clamping system of the test machine. The smaller dimension of each test piece shall be at least 12 mm greater than the outside diameter of the clamping surfaces. Alternatively, the sample may be teste
42、d at the requisite locations across its width, avoiding areas that have already been used for a test by at least 20 mm.NOTE The usable width is defined in ISO 2286-1 as that width, excluding the selvedge, which is consistent in its properties, uniformly finished, and free of unacceptable flaws.7.2 T
43、he face of the coated fabric to be tested shall be defined and agreed between the interested parties. The results might not be the same if the opposite face is tested.8 Time-interval between manufacture and testing8.1 For all test purposes, the minimum time between manufacture and testing shall be 1
44、6 h.8.2 For non-product tests, the maximum time between manufacture and testing shall be four weeks and, for evaluations intended to be comparable, the tests, as far as possible, shall be carried out after the same time-interval.8.3 For products, whenever possible, the time between manufacture and t
45、esting shall not exceed three months. In other cases, tests shall be made within two months of the date of receipt by the customer.9 Conditioning of test piecesCondition the test pieces in one of the standard atmospheres for testing as defined in ISO 2231.When it is required to determine the propert
46、ies of wet material, immerse the test pieces for 24 h in distilled water containing 1 % of ethanol at the chosen standard temperature. Immediately after removal from the water, blot the test piece between two sheets of absorbent paper and test at once.4 ISO 2012 All rights reservedBS ISO 3303-2:2012
47、ISO 3303-2:2012(E)10 Procedure10.1 Increase the pressure on the rubber diaphragm by introducing liquid into the pressure chamber until the test piece bursts. Note the maximum pressure as indicated by the pointer of the pressure-measuring system, as well as the maximum distension of the diaphragm, an
48、d return the pointer to zero. Record, in addition, the type of burst obtained (i.e. cross or slit).10.2 Repeat this procedure for each test piece, ignoring any burst which occurs at or near the edge of the clamp and repeating, in such cases, the test on another test piece.10.3 Calculate the mean of
49、the five results obtained for the bursting pressure and then apply the diaphragm correction factor determined as described in 10.4.10.4 With the same rate of liquid flow as that employed in the test, distend the diaphragm, without the presence of the test piece, but with the upper clamp in position, and note the pressure required to distend it by an amount equal to the average distension of the test piece at burst. This pressure is the “diaphragm correction factor” and is the value by which the mean bursting
