ASTM_D_2816_-_05_2009.pdf

Designation:D281605(Reapproved 2009)Standard Test Method forCashmere Coarse-Hair Content in Cashmere1This standard is issued under the fixed designation D2816;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 a sequential procedure fordetermining whether or not the cashmere coarse-hair content ofa sample exceeds a specified value.NOTE1For the maximum allowable cashmere coarse-hair content incashmere,refer to Specification D2817.NOTE2For the quantitative analysis of cashmere hair and blends ofcashmere hair and other fibers,refer to Test Methods D629.1.2 This test method is applicable only to cashmere hair inthe form of roving,yarn,or fabric,and to the cashmere haircontent of blends with other fibers,where the expectedcashmere coarse-hair content is not more than five masspercent(see Footnote C of Table 1).For greater expected masspercentages of cashmere coarse-hair,see Test Methods D629.1.3 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 TextilesD629 Test Methods for Quantitative Analysis of TextilesD2130 Test Method for Diameter of Wool and OtherAnimalFibers by MicroprojectionD2817 Specification for Maximum Cashmere Coarse-HairContent in CashmereD4845 Terminology Relating to Wool3.Terminology3.1 For all terminology relating to D13.13,Wool and WoolFelt,refer to Terminology D4845.3.1.1 The following terms are relevant to this test method:cashmere,cashmere coarse hair,cashmere coarse hair content,cashmere down,cashmere hair.3.2 For all other terminology related to textiles,see Termi-nology D123.4.Summary of Test Method4.1 One thousand(or more)individual fibers of cashmerehair are examined microscopically and classified either ascashmere down or cashmere coarse-hair on the basis of fiberwidth.4.2 The procedure(7.1 and 7.2)for classifying a fiber ascashmere coarse-hair or cashmere requires microscopic exami-nation of fiber segments of fixed length.The number of fibersegments of each width category is proportional to the totallength of the fibers in each category.Hence,the percentage bylength of cashmere coarse-hair in cashmere hair is equal to thepercentage by number of cashmere coarse-hair segments asdetermined by this procedure.4.3 The observed number of cashmere coarse-hair fibers iscompared with the numbers in Table 1 and a decision is made(1)to accept the lot as conforming,(2)to reject the lot asnonconforming,or(3)to continue testing.The counting,classification,and comparison process is continued until adecision can be made as to whether the lot does or does notconform to the specification.Table 1 is based on stated levelsof confidence.5.Significance and Use5.1 This test method may be used for determining compli-ance with a specification for maximum cashmere coarse-haircontent and is required to be used for determining compliancewith Specification D2817.5.1.1 In case of a dispute arising from differences inreported test results when using Test Method D2816 foracceptance testing of commercial shipments,the purchaser andthe supplier should conduct comparative tests to determine ifthere is a statistical bias between their laboratories.Competentstatistical assistance is recommended for the investigation ofbias.As a minimum,the two parties should take a group of testspecimens that are as homogeneous as possible and that arefrom a lot of material of the type in question.The testspecimens should then be randomly assigned in equal numbers1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsiblity of Subcommittee D13.13 on Wool and Felt.Current edition approved July 1,2009.Published August 2009.Originallyapproved in 1969.Last previous edition approved in 2005 as D2816 05.DOI:10.1520/D2816-05R09.2For 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 for testing.The average results from the twolaboratories should be compared using Students t-test forunpaired data and an acceptable probability level chosen by thetwo parties before the testing is begun.If a bias is found,eitherits cause must be found and corrected or the purchaser and thesupplier must agree to interpret future test results in the light