ASTM D1576-2013 Standard Test Method for Moisture in Wool by Oven-Drying《利用炉烘干法测定羊毛内水分的标准试验方法》.pdf
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1、Designation: D1576 13Standard Test Method forMoisture in Wool by Oven-Drying1This standard is issued under the fixed designation D1576; 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 parenthe
2、ses 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 amountof moisture present in ordinary commercial and industrialsamples of wool in all forms except greas
3、e wool, using theoven-drying technique.1.2 Formulas for calculating the moisture content (as-received basis) and moisture regain (oven-dried basis) aregiven. It is always important to use the correct term whichcorresponds to the basis used in the calculation (see 12.2.1).NOTE 1The determination of m
4、oisture content for textile materials ingeneral is covered in Test Methods D2654, and an optimal method fordetermining the moisture in wool by distillation with toluene is covered inTest Method D2462. A method for sampling wool for the determination ofmoisture in wool is covered in Practice D2525. T
5、he oven-drying methodhas been adapted for cotton in Test Method D2495.1.3 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
6、 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 FiberPresentD1776 Practice for Conditioning and Testing Textile
7、sD2258 Practice for Sampling Yarn for TestingD2462 Test Method for Moisture in Wool by DistillationWith TolueneD2495 Test Method for Moisture in Cotton by Oven-DryingD2525 Practice for Sampling Wool for MoistureD2654 Test Method for Moisture in Textiles (Withdrawn1998)3D3333 Practice for Sampling Ma
8、nufactured Staple Fibers,Sliver, or Tow for TestingD4845 Terminology Relating to Wool3. Terminology3.1 For all terminology related to D13.13, Wool and Felt,see Terminology D4845.3.1.1 The following terms are relevant to this standard:grease wool, moisture content, moisture-free, moisture regain,oven
9、-dried, pulled wool, raw wool, recycled wool, scouredwool, virgin wool, wool, wool, as defined in the Wool ProductsLabeling Act of 1939.3.2 For definitions of all other textile terms see TerminologyD123.4. Summary of Test Method4.1 A specimen of wool material is weighed and then driedto constant mas
10、s at 105 6 2C in an oven supplied withambient air. The loss in mass is considered moisture andreported as either moisture content or moisture regain. Direc-tions are given for the adjustment of the observed results forany change in the moisture content after sampling and beforedrying.5. Significance
11、 and Use5.1 Test Method D2462 for the determination of the mois-ture in wool by distillation with toluene is the preferred methodfor testing wool for moisture for the acceptance testing ofcommercial shipments. If, however, the purchaser and thesupplier agree, Test Method D1576 for the determination
12、of themoisture in wool by oven drying may be used instead.Comparative tests as directed in 5.1.1, may be advisable.5.1.1 In case of a dispute arising from differences inreported test results when using Test Method D1576 foracceptance testing of commercial shipments, the purchaser andthe supplier sho
13、uld conduct comparative tests to determine ifthere is a statistical bias between their laboratories. Competentstatistical assistance is recommended for the investigation of1This test method is under the jurisdiction of ASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D1
14、3.13 on Wool and Felt.Current edition approved July 1, 2013. Published August 2013. Originallyapproved in 1958. Last previous edition approved in 2008 as D1576 90 (2008).DOI: 10.1520/D1576-13.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at ser
15、viceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken,
16、PA 19428-2959. United States1bias. As a minimum, the two parties should take a group of testspecimens which are as homogeneous as possible and whichare from a lot of material of the type in question. The testspecimens should then be randomly assigned in equal numbersto each laboratory for testing. T
17、he average results from the twolaboratories should be compared using Students t-test forunpaired data and an acceptable probability level chosen by thetwo parties before testing is begun. If a bias is found, either itscause must be found and corrected or the purchaser and thesupplier must agree to i
18、nterpret future test results in the light ofthe known bias.5.2 This test method is a simple and convenient method forroutine process control, in-plant evaluation, estimation ofmoisture content of a lot of wool, or any other purpose forwhich a high degree of reproducibility is not necessary (seeSecti
19、on 13).6. Apparatus6.1 Oven, ventilated and thermostatically controlled in thetemperature range of 105 6 2C throughout the enclosure. Theoven may be of either the forced draft or the convection type.6.2 Weighing Containers, of perforated metal if weighing isto be performed in the drying enclosure; o
20、r containers that canbe hermetically sealed (such as glass weighing bottles) if thespecimen is to be cooled in a desiccator before weighing in theambient atmosphere.6.3 Sampling Containers, capable of being sealed. Masonjars have been found to be satisfactory where the sample sizeis not too great. F
21、or larger samples, bags of various plasticmaterials may be suitable if the wall thickness is sufficient toprovide a good moisture vapor barrier (at least 4 mil (approxi-mately 0.1 mm) for polyethylene, for example).6.4 Balance, having a capacity adequate for weighing speci-mens and containers, and a
22、 sensitivity of 0.005 g.7. Sampling7.1 Lot SampleAs a lot sample for acceptance testing,take at random the number of shipping containers directed inapplicable material specification or other agreement betweenthe purchaser and the supplier, such as an agreement to usePractice D2525 for bales of fiber
23、 and containers of top or sliveror to use Practice D2258 for beams or cases of yarn. Considershipping containers to be the primary sampling unit.NOTE 2An adequate specification or other agreement between thepurchaser and supplier requires taking into account the variability betweenshipping container
24、s, between laboratory sampling units within a shippingcontainer, and test specimens within a laboratory sampling unit to producea sample plan with a meaningful producers risk, consumers risk,acceptable quality level, and limiting quality level.7.2 Use extreme care to prevent gain or loss of moisture
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