1、 ISO 2017 Rubber- or plastics-coated fabrics Low-temperature bend test Supports textiles revtus de caoutchouc ou de plastique Essai de flexion basse temprature INTERNATIONAL STANDARD ISO 4675 Third edition 2017-08 Reference number ISO 4675:2017(E) ISO 4675:2017(E)ii ISO 2017 All rights reserved COPY
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4、iso.org ISO 4675:2017(E)Foreword iv 1 Scope . 1 2 Normative references 1 3 T erms and definitions . 1 4 Principle 1 5 Apparatus . 2 6 Test pieces . 2 7 Time-interval between manufacture and testing. 2 8 Conditioning of test pieces . 2 9 Procedure. 2 10 Assessment of damage . 3 10.1 Depth of crack 3
5、10.2 Number of cracks 3 10.3 Length of crack 3 11 Test report . 3 ISO 2017 All rights reserved iii Contents Page ISO 4675:2017(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Intern
6、ational Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with
7、 ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives,
8、 Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of
9、the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations
10、 received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessm
11、ent, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html. This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 4,
12、 Products (other than hoses). This third edition cancels and replaces the second edition (ISO 4675:1990), which has been technically revised. The main changes compared to the previous edition are as follows: a WARNING has been inserted before the scope; Clause 3 has been added; in Figure 2, the dime
13、nsion of H has been corrected.iv ISO 2017 All rights reserved INTERNATIONAL ST ANDARD ISO 4675:2017(E) Rubber- or plastics-coated fabrics Low-temperature bend test WARNING Persons using this document should be familiar with normal laboratory practice. This document does not purport to address all of
14、 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. 1 Scope This document specifies a method for determining the ability of fabrics coated wi
15、th rubber or plastics to resist the effect of low temperature when subjected to bending at specified temperatures after definite periods of exposure. This method is applicable to material with a thickness within the range 0,1 mm to 2,2 mm. For materials of greater thickness than this, modifications
16、to the standard equipment apply (see 9.2, third paragraph). Because fabrics coated with rubber or plastics are used in different applications requiring low temperature flexing, no general relationship between this test and service performance can be given or implied. 2 Normative references The follo
17、wing documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 22
18、31, Rubber- or plastics-coated fabrics Standard atmospheres for conditioning and testing ISO 2286-3, Rubber- or plastics-coated fabrics Determination of roll characteristics Part 3: Method for determination of thickness 3 T erms a nd definiti ons No terms and definitions are listed in this document.
19、 ISO and IEC maintain terminological databases for use in standardization at the following addresses: ISO Online browsing platform: available at http:/ /www.iso.org/obp IEC Electropedia: available at http:/ /www.electropedia.org/ 4 Principle Test pieces, after conditioning, are exposed to low temper
20、ature for a predetermined period. Subsequently, the chilled test piece is subjected to a bending test, followed by examination. ISO 2017 All rights reserved 1 ISO 4675:2017(E) 5 Apparatus 5.1 Cold chamber, in which the test pieces are exposed to low temperature, sufficient in size to contain the ben
21、ding fixture used for testing the test pieces and to permit the operation of the fixture to bend the test piece without removal from the chamber. The cold chamber shall also have sufficient work space to permit the conditioning of test pieces as outlined in Clause 8. It shall be capable of maintaini
22、ng a uniform atmosphere of cold air or any other suitable gas at specified temperatures to within a tolerance of 1 C. 5.2 Bending jig, for bending the test pieces, as shown in Figure 1 and Figure 2. Masses, mass tolerances and dimensions shall be as specified in Figure 2. 5.3 Glass plates, of suffic
23、ient number, having dimensions of approximately 125 mm 175 mm, for use when conditioning all test pieces. The thickness of the glass plates shall be such as to permit easy handling. 5.4 Gloves, for handling test pieces within the cold chamber. The gloves will be conditioned at the same temperature a
24、s the test pieces. A second pair of gloves at room temperature shall therefore be available for wearing within the cold gloves as protection for the operator. 6 Test pieces Take three test pieces, each measuring 25 mm 100 mm, equally spaced across the working width of the sample and with their lengt
25、hs parallel to the longitudinal direction of the coated fabric, unless otherwise specified. 7 Time-interval between manufacture and testing 7.1 For all test purposes, the minimum time between manufacture and testing shall be 16 h. 7.2 For non-product tests, the maximum time between manufacture and t
26、esting shall be 4 weeks; for evaluations intended to be comparable, each test, as far as possible, shall be carried out after the same time-interval. 7.3 For product tests, whenever possible, the time between manufacturing and testing shall not exceed 3 months. In other cases, tests shall be made wi
27、thin 2 months of the date of receipt of the products by the customer. 8 Conditioning of test pieces Immediately prior to testing, condition the test pieces in one of the standard atmospheres defined in ISO 2231. 9 Procedure 9.1 Measure the thickness of each test specimen in accordance with ISO 2286-
28、3. Place the three conditioned test pieces between glass plates (5.3), 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 2 ISO 2017 All rights reserved ISO 4675:2017(E) in position, the bending
29、jig (5.2) and the cold gloves (5.4) in the cold chamber (5.1). Unless otherwise specified, expose them for 4 h to the specified test temperature. 9.2 At the termination of the exposure period and without taking them out of the test chamber, remove the test pieces from between the glass plates one at
30、 a time (CAUTION, see below) and place in the bending jig with the flexing plate held in the open 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 b
31、oth surfaces may be evaluated unless otherwise specified. CAUTION Gloves shall be worn at all times when handling test pieces prior to making the bend test. When materials greater than 2,2 mm in thickness are to be tested, it can be necessary to increase the mass of the steel top bar G (see Figure 2
32、) and increase the clearance between the back plate and mandrel to enable the specimen to be inserted. In this case, report the deviation in the test report. 9.3 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. 9.4 Aft
33、er all the test pieces have been tested, remove them from the test chamber and examine each test piece for fractures or cracks in their coating under a magnification of 5. During the examination, fold all test pieces through 180 in the same direction as the bend made during the test. 10 Assessment o
34、f damage 10.1 Depth of crack Grade the cracking, if any, according to the following five-part scale: A: surface or finish crack not exposing the cellular layer, middle layer or substrate; B: cracking into but not through the middle layer; C: cracking through to the substrate or base fabric; D: crack
35、ing completely through the material; O: no cracking. 10.2 Number of cracks Record the number of cracks of greatest severity, up to 10. If there are more than 10, record “over 10”. 10.3 Length of crack Record the length, in millimetres, of the largest crack of greatest severity. 11 Test report The te
36、st report shall include the following particulars: a) a reference to this document, i.e. ISO 4675; b) the conditioning atmosphere used (see Clause 8); c) the thickness of the coated fabric and the pressure at which it was measured; d) the temperature at which the test pieces were tested; ISO 2017 Al
37、l rights reserved 3 ISO 4675:2017(E) e) the duration of the exposure period; f) the surface(s) tested; g) the depth of crack in accordance with the five-part scale in 10.1, the number of cracks and the length of the largest crack in each test piece; h) details of any deviations from the standard tes
38、t; i) all details necessary for the identification of the coated fabric, including, if possible, the date of manufacture; j) the date of the test. Key 1 trigger pin to release 2 test piece Figure 1 Bending jig for coated fabrics4 ISO 2017 All rights reserved ISO 4675:2017(E) Key A thickness of steel
39、 top bar (13 mm) B length of steel top bar (25 mm) C length of flexing plate (100 mm) D distance between bending centre and edge of flexing plate (5 mm) E distance between bending centre and bottom of the groove of cleat (48 mm) F aluminium stationary bending plate (100 mm 110 mm 13 mm) G steel top
40、bar and its mass (100 mm 25 mm 13 mm) (250 g 5 g) H flexing plate/aluminium bending plate (100 mm 95 mm 13 mm) (375 g 2,5 g including hinge) J offset (3 mm) K mandrel (hinge pin) (3 mm) L groove of cleat (3 mm x 3 mm) M thickness of cleat (6 mm) N test piece O cleat P support base Figure 2 Dimensions of bending jig ISO 2017 All rights reserved 5 ISO 4675:2017(E) ISO 2017 All rights reserved IC S 59.080.40 Price based on 5 pages
