1、Designation:D272094(Reapproved 2012)1Standard Practice forCalculation of Commercial Weight and Yield of ScouredWool,Top,and Noil for Various Commercial Compositions1This standard is issued under the fixed designation D2720;the number immediately following the designation indicates the year oforigina
2、l 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.1NOTEThe terminology section was updated in July 2012.1.Scope1.1 This practice inclu
3、des,in Table 1,the commercialcomposition corresponding to different commercial designa-tions for scoured wool,wool top,and wool noil,all of whichcontain,in addition to wool base,various percentages ofmoisture,material extractable with alcohol,and mineral matter.1.2 This practice includes directions
4、for the calculation ofthe commercial weight of wool corresponding to differentcommercial designations for several forms of wool,and forconverting the commercial weight(mass)calculated on onebasis to the commercial weight calculated on a different basis.1.3 This practice also includes directions for
5、calculating theyield,on various commercial designation bases,obtained byprocessing raw wool,and for converting the yield calculated onone commercial designation basis to the yield on anothercommercial designation basis.NOTE1Because of trade practice the term“weight”is used in thispractice instead of
6、 the technically correct term“mass”.1.4 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 limitat
7、ions prior to use.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD4845 Terminology Relating to WoolD584 Test Method for Wool Content of Raw WoolLaboratory Scale3.Terminology3.1 For all terminology related to D13.13,refer to Termi-nology D4845.3.1.1 The following terms
8、 are relevant to this standard:commercial composition,commercial designation,commercialweight,oven dried,vegetable matter base,wool base,yield.3.2 For all other terminology related to textiles,refer toD123.4.Commercial Compositions of CommerciallyDesignated Wool4.1 Significance and UseCommercial sco
9、ured wool,top,and clean noil contain,in addition to wool base,varyingpercentages of moisture,oil or fat,other solvent-extractablematerial,mineral matter,and perhaps other impurities.Toestablish a basis for commercial or legal weights for thesecommodities,various organizations representing interested
10、groups use specific commercial designations,such as CleanWool Fiber Present,for each of which a commercial compo-sition is specified.4.2 A number of commercial designations widely used inthe wool trade are listed in Table 1 with their commercialcompositions.5.Commercial Weight of Lots of Commerciall
11、yDesignated Wool5.1 Significance and Use:5.1.1 The observed composition of a lot of wool to which anamed commercial designation is applied,such as a shipmentof American Dry Combed Top,may and usually does differfrom the commercial composition,in which case the observedweight of the lot is adjusted t
12、o secure the commercial weight.5.1.2 The commercial compositions are used also in calcu-lations to convert the commercial weight of a lot of woolhaving a named commercial designation(for example,Ameri-can Oil Combed Top)to the equivalent commercial weight ona different commercial designation basis(f
13、or example,Brad-ford Dry Combed Top).5.2 Calculation of Commercial Weight To adjust theobserved weight of a lot of wool to which a named commercial1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.13 on Wool and Felt.Current
14、 edition approved July 1,2012.Published August 2012.Originallyapproved in 1968.Last previous edition approved in 2006 as D2720 94(2006).DOI:10.1520/D2720-94R12E01.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of
15、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 designation is applied to its commercial weight,determine thecomposition of the lot of wool a
16、t the time of weighing and useEq 1:W 5 O 3b/B!(1)where:W=commercial weight of the lot,O=observed weight of the lot,B=percentage of wool base specified in the applicablecommercial composition(Table 1),andb=observed wool base content,as a percentage of theobserved weight of the lot.5.3 Conversion of Commercial Weights To convert thecommercial weight of a lot of wool(5.2)from one commercialdesignation basis to another,use Eq 2:W25 W13B1/B2(2)where:W1,W2=commercial weights of a lot of wool on the ba
