ASTM_D_1294_-_05_2013.pdf

Designation:D129405(Reapproved 2013)Standard Test Method forTensile Strength and Breaking Tenacity of Wool FiberBundles 1-in.(25.4-mm)Gage Length1This standard is issued under the fixed designation D1294;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A 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 the break-ing force(or load)and estimation of the tensile strength andtenacity of wool fiber bundles with a 1-in.(25.4-mm)gagelength.A procedure for preparation of the fiber bundle isincluded.1.2 The values stated in inch-pound units are to be regardedas standard;the values in SI units are provided for informationonly.Because the instrument is calibrated in inch-pound units,inch-pound units are shown first,contrary to Committee D13policy.NOTE1For other methods of measuring breaking tenacity of fiberbundles,refer to Test Methods D1445 and D2524.NOTE2This test method can be used for other fibers that lendthemselves to the same kind of preparation but the difference in densitymust be taken into account when calculating the tensile strength.It is notnecessary to know or correct for the density of a fiber when calculatingbreaking tenacity.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibiltiy 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:2D76 Specification for Tensile Testing Machines for TextilesD123 Terminology Relating to TextilesD1445 Test Method for Breaking Strength and Elongation ofCotton Fibers(Flat Bundle Method)D1776 Practice for Conditioning and Testing TextilesD2524 Test Method for Breaking Tenacity of Wool Fibers,Flat Bundle Method18-in.(3.2-mm)Gage LengthD2525 Practice for Sampling Wool for MoistureD4845 Terminology Relating to Wool3.Terminology3.1 For all terminology related to Wool and Wool Felt,D13.13,refer to Terminology D4845.3.1.1 The following terms are relevant to this standard:gagelength,recycled wool,tenacity,tensile strength,wool(asdefined in the Wool Products Labeling Act of 1939).3.2 For all other terminology related to textiles see Termi-nology D123.4.Summary of Test Method4.1 The strength determination is based on the load requiredto break a bundle of fibers which had been parallelized andheld under uniform tension with masking tape.A 1-in.(25.4-mm)spacing between the tapes(and clamps at the zero setting)makes possible the cutting and weighing of this amount of fiberfor use in calculating the strength expressed as breakingtenacity in grams-force per tex or tensile strength in pounds-force per square inch.5.Significance and Use5.1 Test Method D1294 for the determination of tensilestrength may be used for the acceptance testing of commercialshipments of wool,but caution is advised since techniciansmay fail to get good agreement between results.Comparativetests as directed in 5.1.1 may be advisable.5.1.1 If there are differences of practical significance be-tween reported test results for two laboratories(or more),comparative test should be performed to determine if there is astatistical bias between them,using competent statistical assis-tance.As a minimum,use the samples for such a comparativetest that are as homogenous as possible,drawn from the samelot of material as the samples that resulted in disparate resultsduring initial testing and randomly assigned in equal numbersto each laboratory.The test results from the laboratoriesinvolved should be compared using a statistical test forunpaired data,a probability level chosen prior to the testingseries.If bias is found,either its cause must be found andcorrected,or future test results for that material must beadjusted in consideration of the known bias.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.13 on Wool and Felt.Current edition approved Jan.1,2013.Published January 2013.Originallyapproved in 1953.Last previous edition approved in 2005 as D1294 05.DOI:10.1520/D1294-05R13.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 This test method is useful in studying the relationshipbetween fiber strength and product quality;results should beconsidered comparative rather than fundamental since thestrength found will be lower than the sum of the strengths ofthe individual fibers present due to slight differe