1、Designation: D 5171 09Standard Test Method forImpact Resistance of Plastic Sew-Through Buttons1This standard is issued under the fixed designation D 5171; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A
2、 number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of impactresistance of plastic sew-through buttons.1.2 The values stated in either acceptabl
3、e metric units orother units shall be regarded separately as standard. The valuesexpressed in each system may or may not be exact equivalents:therefore, each system must be used independently of the other,without combining values in any way.1.3 This standard does not purport to address all of thesaf
4、ety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 123 Terminology Relating to T
5、extilesD 618 Practice for Conditioning Plastics for TestingD 5497 Terminology Relating to Buttons3. Terminology3.1 Definitions:3.1.1 button, na knob, disc, or similar object which whenforced through a narrow opening or buttonhole, fastens onepart of a garment or other flexible substrate to another (
6、See alsosew-through button)3.1.1.1 DiscussionAlthough the primary purpose of but-tons is to serve as fasteners, buttons can also be used asdecoration.3.1.2 face, nin buttons, that portion which will be ex-posed after attaching to the substrate.3.1.3 impact resistance, nresistance to fracture under t
7、hesudden application of an external force.3.1.4 ligne size, nan English unit, used to measure but-tons, one ligne equals 0.635 mm (0.025in).3.1.5 sew-through buttons, na button that has two or moreholes on its face for passage of a needle and thread or possiblyother material in order to attach it to
8、 a flexible substrate.3.1.6 For other textile terminology used in this method,refer to Terminology D 123.3.1.7 For definitions of button terms used in this method,refer to Terminology D 5497.4. Summary of Test Method4.1 Individual buttons are placed on a surface centeredunder a tube through which a
9、preselected mass falls from apreselected height. After the mass impacts the button theimpacted button is removed and visually examined using a 5Xmagnifying glass for breakage, cracking, or chipping.5. Significance and Use5.1 This test method may be used to determine the ability ofa button to resist
10、breaking under impact, for example inpressing the end item, which could cause the button to fail.NOTE 1In the development of this test method it was found that thefollowing factors influenced the ability of a button to resist failure underimpact conditions: resin formulation, shape ligne size, thick
11、ness, numberand spacing of holes. Buttons may also pass this test but fail during thepressing of a garment due to the presence of heat during pressing.5.1.1 If there are differences of practical significance be-tween the reported test results for two laboratories (or more),comparative tests should b
12、e performed to determine if there isa statistical bias between them, using competent statisticalassistance. As a minimum, test samples should be used that areas homogeneous as possible, that are drawn from the materialfrom which the disparate rest results were obtained, and thatare randomly assigned
13、 in equal numbers to each laboratory fortesting. Other materials with established test values may beused for this purpose. The test results from the two laboratoriesshould be compared using a statistical test for unpaired data, ata probability level chosen prior to the testing series. If a bias isfo
14、und, either its cause must be found and corrected, or futuretest results must be adjusted in consideration of the knownbias.5.2 Test Method D 5171 for the determination of the impactresistance of buttons may be used for acceptance testing ofcommercial shipments of buttons but caution is advisable si
15、nceinformation is lacking on precision.1This test method is under the jurisdiction of ASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.54 on Subassemblies.Current edition approved March 1, 2009. Published March 2009. Originallyapproved in 1991. Last previous edition
16、 approved in 2006 as D 517100(2006).2For referenced ASTM standards, visit 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.1Copyright ASTM Internati
17、onal, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Apparatus6.1 Impact Resistance Testing MachineThe impact resis-tance tester consists of a tube through which a plunger ofstandard mass drops onto the button from a predeterminedheight. The button is centrall
18、y positioned based on ligne size,by means of a locating jig, on a flat metal surface. The energyof impact is determined by the mass of the plunger and theheight of the drop.6.2 Magnifying Glassa 5X magnifying glass is used tovisually examine the buttons after impact.6.3 Measuring Devicemeasuring cal
19、ipers or micrometer,to determine the ligne size of buttons.7. Sampling7.1 Laboratory SampleAs a laboratory sample, randomlyselect a quantity of buttons, approximately 100 to 200, from aFIG. 1 Impact-Resistance TesterD5171092carton and from contained boxes, that adequately representsthe material, fro
20、m which test specimens may be selected.7.2 Test SpecimensRandomly select 15 buttons from thelaboratory sample for testing. If test specimens are submittedfor preproduction approval, testing 1 dozen buttons is accept-able.8. Conditioning8.1 Condition the specimens as directed in Practice D 618using p
21、rocedure E. Following conditioning, prepare the speci-mens for testing as instructed in 9.4 of practice D 618.Preconditioning is not required.9. Procedure9.1 Determine Button Ligne SizeUsing a set of calipers ora micrometer slowly bring the instrument faces or anvils intocontact with the button to o
22、btain the button diameter. Dividethe measured diameter in mm (in) by the constant 0.635 mm(0.025 in.) and record to the nearest whole number as the lignesize.9.2 Determine Impact ResistancePlace specimen in cen-tering device for ligne size of button so it lies at the center ofthe vertical tube. Allo
23、w the mass to fall from a predeterminedand reproducible height onto the button. Lift the mass andremove the specimen from the metal base.10. Evaluation10.1 Visually examine the tested specimens with a 5Xmagnifying glass for cracking, chipping, and breakage, any ofwhich constitutes damage. Test the r
24、emaining specimens.11. Report11.1 State that the specimens were tested as directed in TestMethod D 5171. Describe the material or product sampled.11.1.1 Total number of specimens,11.1.2 Button ligne size,11.1.3 Height of fall and mass of plunger, if the standardconditions are not used.11.1.4 Number
25、of specimens damaged due to (1) cracking,(2) chipping (3) breakage.12. Precision and Bias12.1 No information is presented about either the precisionor bias of this test method since the test result is nonquantita-tive.12.2 BiasNo justifiable statement can be made on the biasof Test Method D 5171 for
26、 testing the impact resistance ofbuttons since the true value cannot be established by anaccepted referee method.13. Keywords13.1 button; impact resistance; strengthASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this
27、 standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, 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
28、reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for 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 therespo
29、nsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing 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).D5171093
