ASTM_D_1282_-_05_2009.pdf

Designation:D128205(Reapproved 2009)Standard Test Method forResistance to Airflow as an Indication of Average FiberDiameter of Wool Top,Card Sliver,and Scoured Wool1This standard is issued under the fixed designation D1282;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 estimation of the averagefiber diameter of wool fibers by use of the Port-Ar and theWIRA Fiber Fineness Meter instrument,which operate on theair-flow principle.Other air-flow instruments have not beentested with this method.The method is directly applicable tonon-medullated,carded wool and wool top.1.2 This test method is applicable to grease wool andscoured wool after the samples of such materials have beenprepared as directed in Test Method D2130.NOTE1The use of the Micronaire instrument for measuring thefineness of cotton fibers is covered in Test Method D1448.The assignment of grade for wool and mohair is covered in Specifica-tions D3991 and D3992.1.3 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 establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1060 Practice for Core Sampling of Raw Wool in Packagesfor Determination of Percentage of Clean Wool FiberPresentD1448 Test Method for Micronaire Reading of Cotton Fi-bersD2130 Test Method for Diameter of Wool and OtherAnimalFibers by MicroprojectionD3991 Specifications for Fineness of Wool or Mohair andAssignment of GradeD3992 Specifications for Fineness of Wool Top or MohairTop and Assignment of GradeD4845 Terminology Relating to Wool2.2 Other Standard:IWTO-6-92(E)Method of Test for the Determination of TheMean Diameter of Wool Fibers in Combed Sliver Usingthe Air-Flow ApparatusIWTO-28-82(E)Determination By The Airflow Method ofthe Mean Fibre Diameter of Core Samples of Raw Wool3.Terminology3.1 For all terminology related to wool and wool felt,referto Terminology D4845.3.1.1 The following terms are relevant to this standard:sliver,specific area,top,and wool.3.2 For all other terminology related to textiles,see Termi-nology D123.4.Summary of Test Method4.1 The resistance to air flow of predetermined mass ofwool compressed to a fixed volume is measured.The instru-ments approved for use have been calibrated to read averagediameter in micrometres.Specimens of wool top are rated witha Wool Top Scale and specimens of carded,scoured wool andscoured12-in.(13.0-mm)cores are rated with a Scoured WoolScale.If instruments are properly calibrated,results are inter-changeable.5.Significance and Use5.1 This test method is not recommended for the acceptancetesting of commercial shipments of wool top,card sliver,orscoured wool since the referee method,Test Method D2130,isrecommended for that purpose.Although this test method isnot recommended for acceptance testing,it is useful for fastquality control checks.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 numbers1This 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 July 1,2009.Published August 2009.Originallyapproved in 1953.Last previous edition approved in 2005 as D1282 05.DOI:10.1520/D1282-05R09.2For 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 to 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.5.2 The specific area of the wool fibers is measured by theresistance in air flow.The resistance to air flow has been relatedto average fiber diameter measured by the microprojectionmethod.The instruments have been calibrated