1、Designation: D3992 94 (Reapproved 2012)1Standard Specifications forFineness of Wool Top or Mohair Top and Assignment ofGrade1This standard is issued under the fixed designation D3992; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、 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 These specifications are applicable in the classifi
3、cation,by fineness grade, of the fiber in wool top, mohair top, woolyarns, mohair yarns, wool fabrics, and mohair fabrics of theworsted type.NOTE 1For fineness specifications for wool, mohair, and alpaca, referto Specifications D3991 and D2252.2. Referenced Documents2.1 ASTM Standards:2D123 Terminol
4、ogy Relating to TextilesD2130 Test Method for Diameter of Wool and OtherAnimal Fibers by MicroprojectionD2252 Specification for Fineness of Types of AlpacaD3991 Specifications for Fineness of Wool or Mohair andAssignment of GradeD4845 Terminology Relating to Wool2.2 Federal Standards:Official Standa
5、rds of the United States for Grades of WoolTop, Section 31.1003Measurement Method for Determining Grade of Wool Top,Section 31.3013Official Standards of the United States for Grades of MohairTop, Section 32.1004Measurement Method for Determining Grade of MohairTop, Section 32.30243. Terminology3.1 F
6、or all terminology related to D13.13, refer to Termi-nology D3991.3.1.1 The following terms are relevant to this standard:average fiber diameter, fineness, grade, mohair, top, wool.3.2 For all other terminology related to textiles, refer toTerminology D123.4. Requirements4.1 The grade of wool top sh
7、all conform to Table 1.4.2 The grade of mohair top shall conform to Table 2.5. Significance and Use5.1 These specifications are considered satisfactory for clas-sifying wool top or mohair top by grade and provide a basis foracceptance of commercial shipments.6. Test Method6.1 Test the material as di
8、rected in Test Method D2130.Measure at least the minimum number of fibers needed toattain confidence limits of the mean within 60.4 m at aprobability level of 95 % (see Annex A1 of Test MethodD2130).7. Assignment of Grade7.1 Compare the observed average fiber diameter and fiberdiameter distribution,
9、 determined as directed in Section 6, withthe specifications for the various grades for the material beingtested in Table 1 or Table 2. Assign the grade that correspondsto the average fiber diameter and fiber diameter distributionrequirements specified in Table 1 for wool top or Table 2 formohair to
10、p. If the observed average diameter and fiber diam-eter distribution correspond to a single grade, assign that grade.If the fiber diameter distribution does not meet the require-ments for the grade to which the average fiber diametercorresponds, assign a dual grade designation, the seconddesignation
11、 being one grade coarser than the grade to which theaverage fiber diameter corresponds. Assignment of grade isillustrated by the examples in 7.1.1 and 7.1.2.7.1.1 Wool Top:7.1.1.1 Example 1Average fiber diameter, 28.10 m; fiberdiameter distribution; 30.0 m and under, 64 %; 30.1 m andover, 36 %; 50.1
12、 m and over, 1 %: grade designation, 56s.1These specifications are under the jurisdiction of ASTM Committee D13 onTextiles and are the direct responsibility of Subcommittee D13.13 on Wool and Felt.Current edition approved July 1, 2012. Published August 2012. Originallyapproved in 1981. Last previous
13、 edition approved in 2006 as D3992 94 (2006).Replaces D472 and D1381. DOI: 10.1520/D3992-94R12E01.2For 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 Docu
14、ment Summary page onthe ASTM website.3Federal Register, Vol 33, No. 248, Dec. 21, 1968, pp. 1907319076.4Federal Register, Vol 38, No. 4, Jan. 8, 1976, pp. 964967.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.1.1.2 Example 2Averag
15、e fiber diameter, 28.10 m; fiberdiameter distribution; 30.0 m and under, 61 %; 30.1 m andover, 39 %; 50.1 m and over, 2 %: grade designation, 56/54s.7.1.2 Mohair Top:7.1.2.1 Example 1Average fiber diameter, 32.60 m; fiberdiameter distribution; 40 m and under, 83 %; 40.1 m andover, 17 %; 50.1 m and o
16、ver, 3 %: grade designation, 28s.7.1.2.2 Example 2Average fiber diameter, 32.60 m; fiberdiameter distribution; 40 m and under, 79 %; 40.1 m andover, 21 %; 50.1 m and over, 4 %: grade designation, 28/26s.7.2 Interpretation of ResultsThe true average fiber diam-eter of a lot of wool top or mohair top
17、can be determined onlyby measurement of every fiber in the lot. Since this is notpracticable, reliance is placed on the result obtained throughthe measurement of a sample. The likelihood that the observedaverage fiber diameter correctly identifies the grade increasesas the average approaches the mid
18、point of the fineness range ofthe grade concerned, and decreases as the average approacheseither limit of such range. The probability of the correctness ofthe grade designation of a lot may be increased by increasingthe number of fibers measured.8. Conformance8.1 When the purchaser and the supplier
19、have agreed uponspecific requirements for fineness, wool or mohair top that failsto meet those requirements may be rejected. Rejection shouldbe reported to the supplier in writing. In case of disagreementwith the results of the tests, the supplier may make claim for aretest.9. Keywords9.1 animal fib
20、ers (except wool); number grade; wool; yarnTABLE 1 Specifications for Grades of Wool TopA,BGradeAverage FiberDiameterRange, mFiber Diameter Distribution, %25 mand Un-der, min30 mand Un-der, min40 mand Un-der, min25.1 mandOver,max30.1 mandOver,max40.1 mandOver,max50.1 mandOver,max60.1 mandOver,maxFin
21、er than 80s under 18.10 95 . . 5 1 . . .80s 18.1019.59 91 . . 9 1 . . .70s 19.6021.09 83 . . 17 3 . . .64s 21.1022.59 . 92 . . 8 1 . .62s 22.6024.09 . 86 . . 14 1.5 . .60s 24.1025.59 . 80 . . 20 2 . .58s 25.6027.09 . 72 . . 28 . 1 .56s 27.1028.59 . 62 . . 38 . 1 .54s 28.6030.09 . 54 . . 46 . 2 .50s
22、30.1031.79 . 44 . . 56 . 2 .48s 31.8033.49 . . 75 . . 25 . 146s 33.5035.19 . . 68 . . 32 . 144s 35.2037.09 . . 62 . . 38 . 240s 37.1038.99 . . 54 . . 46 . 336s 39.0041.29 . . 44 . . 56 . 4Coarser than 36s over 41.29 . . . . . . . .AIn each grade, the minimum percent and the first maximum percent tot
23、al 100 %. The second maximum percent distribution permitted for any grade is part of, and notin addition to, the first maximum percent.BThe requirements in Table 1 are the same as the Official Standards of the United States for Grades of Wool Top as promulgated by the U.S. Department of Agriculture,
24、effective Jan. 20, 1969.TABLE 2 Specifications for Grades of Mohair TopA,BGradeFineness Range,mFiber Diameter Distribution, %30 mand Un-der, min40 mand Un-der, min50 mand Un-der, min30.1 mand Over,max40.1 mand Over,max50.1 mand Over,max60.1 mand Over,maxFiner than 40s under 23.55 80 . . 20 1 . .40s
25、23.5525.54 74 . . 26 4 . .36s 25.5527.54 67 . . 33 6 . .32s 27.5529.54 57 . . 43 8 . .30s 29.5531.54 47 . . 53 13 . .28s 31.5533.54 . 80 . . 20 3 .26s 33.5535.54 . 73 . . 27 5 .24s 35.5537.54 . 64 . . 36 8 .22s 37.5539.54 . 56 . . 44 13 .20s 39.5541.54 . . 82 . . 18 618s 41.5543.54 . . 77 . . 23 8Co
26、arser than 18s over 43.54 . . . . . . .AIn each grade, the minimum percent and the first maximum percent total 100 %. The second maximum percent distribution permitted for any grade is part of, and notin addition to, the first maximum percent.BThe requirements in Table 2 are the same as the Official
27、 Standards of the United States for Grades of Mohair Top as promulgated by the U.S. Department of Agriculture,effective Jan. 1, 1973.D3992 94 (2012)12ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. User
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30、l 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,
31、 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).D3992 94 (2012)13
