1、Designation: D 2136 02 (Reapproved 2007)Standard Test Method forCoated FabricsLow-Temperature Bend Test1This standard is issued under the fixed designation D 2136; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last re
2、vision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 Fabrics coated with rubber or rubber-like m
3、aterialsdisplay increased stiffening when exposed to decreasing am-bient temperatures. This test method describes a simple pass/fail procedure whereby material flexibility at a specified lowtemperature can be determined. Failure is indicative of unac-ceptability of the coated fabric for use at that
4、temperature.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to e
5、stablish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. For specificprecautionary statement see 8.1.2. Referenced Documents2.1 ASTM Standards:2D 751 Test Methods for Coated Fabrics2.2 ASTM Adjuncts:Bending Fixture Drawings33. Summary
6、 of Test Method3.1 Specimens cut from the coated fabric are conditioned ata selected low temperature for a specified duration. Whileremaining exposed at that temperature, they are then individu-ally placed in a bending apparatus and bent through a specifiedangle. Failure of the coated fabric is indi
7、cated by fracture of thespecimen or the appearance of surface cracks in the coating.4. Significance and Use4.1 This test method evaluates the ability of coated fabricsto withstand a prescribed bend at an established low tempera-ture. Fabrics coated with polymeric materials are used in manyapplicatio
8、ns requiring low temperature flexing. Data obtainedusing this test method may be used to predict in-use behavioronly in applications in which the conditions of deformation aresimilar to those specified in this test method. This test methodhas been found useful for specification purposes but does not
9、necessarily indicate the lowest temperature at which thematerial may be used.5. Apparatus5.1 Low-Temperature ChamberThe chamber in which thetest specimens are exposed to low temperature shall besufficient in size to contain the bending fixture used for testingthe specimens and to permit the operatio
10、n of the fixture to bendthe specimens without removal from the chamber. The cham-ber shall also have sufficient work space to permit the condi-tioning of test specimens in accordance with Section 8 of thistest method. It shall be capable of maintaining a uniformatmosphere of cold dry air or any suit
11、able gas at specifiedtemperatures within a tolerance of 61C (61.8F).5.2 Bending Fixture3The basic requirements for the de-vice used for bending the test specimens are shown in Fig. 1and Fig. 2. Dimensions and mass shall conform to Fig. 2.1This test method is under the jurisdiction of ASTM Committee
12、D11 on Rubberand is the direct responsibility of Subcommittee D11.14 on Time and Temperature-Dependent Physical Properties.Current edition approved May 1, 2007. Published July 2007. Originally approvedin 1962. Last previous edition approved in 2002 as D 2136 02e1.2For referenced ASTM standards, visi
13、t the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Detail drawings of this apparatus are available at a nominal cost from ASTMInternational Headqua
14、rters. Order Adjunct No. ADJD2136. Original adjunct pro-duced in 1988.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.3 Glass PlatesA sufficient number of glass plates ap-proximately 125 by 175 mm (5 by 7 in.) shall be used whencon
15、ditioning all test specimens. All test specimens shall beplaced between glass plates during the exposure period toeliminate any curling or bending. The thickness of the glassplates shall be of such size as to permit ease of handling.5.4 GlovesA pair of gloves shall be required for handlingtest speci
16、mens within the low-temperature chamber.5.5 LubricationA suitable low-temperature grease, ifneeded, should be applied to the trigger release and hinge pinof the bending apparatus to prevent stiffening during theconditioning period.6. Sampling6.1 Samples for test specimen preparation shall be takenfr
17、om roll ends at a frequency agreed upon between thepurchaser and the supplier.7. Test Specimens7.1 The test specimens shall be 25 6 1mm(16 0.04 in.)wide and 100 6 2mm(46 0.08 in.) long. They shall be cutwith the longer dimension parallel to the lengthwise directionof the coated fabric, unless otherw
18、ise specified.7.2 At least three specimens shall be cut from each samplebeing tested.8. Conditioning8.1 Test specimens shall be conditioned prior to the test inaccordance with the standard condition described in TestMethods D 751.8.2 Place the test specimens between glass plates withsufficient space
19、 between each specimen to permit the passageof cold air during the conditioning period. Place the glassplates with the specimens held in position, the bendingapparatus and the gloves in the low-temperature chamber.Unless otherwise specified, expose them for4htocold, dry airor any suitable gas at the
20、 specified temperature.9. Procedure9.1 At the termination of the exposure period, and while stillin the test chamber, remove the specimens from between theglass plates one at a time (WarningGloves must be worn atall times when handling specimens prior to making the bendtest.) and place into the bend
21、ing apparatus with the flexingplate held into the open position by the trigger pin. Face theside to be evaluated away from the mandrel unless otherwisespecified.9.2 As soon as the specimen is in position in the bendingapparatus, release the trigger and permit the flexing plate tomake a free fall.9.3
22、 After all specimens have been tested, remove them andexamine for fractures or coating cracks under 53 magnifica-tion. During the examination, fold all specimens 180 in thesame direction as the bend during the test.9.4 When three specimens are tested and none fracture orshow any cracks in the coatin
23、g after being tested, the materialshall be considered to have passed the bending test. If the threeFIG. 1 Bending Jig for Coated Fabricsmm in.A13 0.5B25 1C 100 4D5 0.2E48 19F 100 3 110 3 13 4 3 4.3 3 0.5G 100 3 25 3 13 4 3 1 3 0.5H 100 3 100 3 13 4 3 4 3 0.5I 100 3 25 4 3 1J 3 0.12K 3 0.12L33 3 0.12
24、 3 0.12M 6 0.25FIG. 2 Bending Jig, Schematic DimensionsD 2136 02 (2007)2specimens fracture or show cracks, the material shall beconsidered to have failed.9.5 If only one or two specimens show failures, test threeadditional specimens. If any of these show fractures or coatingcracks, the material shal
25、l then be considered to have failed.10. Report10.1 Report the following information:10.1.1 Results of the tests expressed as “passed” or “failed,”and the number of specimens tested,10.1.2 Temperature at which the specimens were tested,10.1.3 Duration of the exposure period, and10.1.4 Identification,
26、 date of manufacture, and date of test.11. Precision and Bias11.1 Since this testing makes use of a pass/fail performancecriterion, the application of the usual precision and biasanalysis is not possible.12. Keywords12.1 bend test; coated fabrics; flexibility; low temperature;low temperature bend te
27、st; rubber-coated fabrics; subnormaltest temperatureASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rig
28、hts, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for
29、 revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing
30、 you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 2136 02 (2007)3
