ASTM_D_2495_-_07_2012.pdf

Designation:D249507(Reapproved 2012)Standard Test Method forMoisture in Cotton by Oven-Drying1This standard is issued under the fixed designation D2495;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 determination of the amountof moisture in cotton by oven-drying and is applicable to rawcotton,cotton stock in process,and cotton waste.1.2 This test method may also,by agreement,be used fordetermining moisture in blends of cotton with other fibers.1.3 This test method offers alternative procedures forweighing the dried specimens,one procedure using an ovenbalance(9.3)and the other using a desiccator(9.4).NOTE1For other methods of determination of moisture in textilematerials refer to Test Method D2654,which includes two options basedon drying in an oven,and one option based on distillation with animmiscible solvent:Methods D885,Test Method D1576,Test MethodD2462.1.4 The values stated in SI units are to be regarded as thestandard.No other units are included in this standard.1.5 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 TextilesD885 Test Methods for Tire Cords,Tire Cord Fabrics,andIndustrial Filament Yarns Made from ManufacturedOrganic-Base FibersD1441 Practice for Sampling Cotton Fibers for TestingD1576 Test Method for Moisture in Wool by Oven-DryingD2462 Test Method for Moisture in Wool by DistillationWith TolueneD2654 Test Method for Moisture in Textiles(Withdrawn1998)3D7139 Terminology for Cotton Fibers3.Terminology3.1 For all terminology relating to D13.11,Cotton Fibers,refer to Terminology D7139.3.1.1 The following terms are relevant to this standard:cotton waste,ginned lint(cotton),lint cotton,moisture content,moisture-free,moisture regain,oven-dry,percentage point,rawcotton,seed cotton,stock in process.3.2 For all other terminology related to textiles,refer toTerminology D123.4.Summary of Test Method4.1 Specimens are weighed,dried in an oven,and re-weighed.The difference between the original mass and theoven-dry mass is calculated in percent,either as moisturecontent or moisture regain.5.Significance and Use5.1 This test method for testing the moisture content ofcotton can be used for acceptance testing of commercialshipments of lint cotton provided the between-laboratory biasis known.5.1.1 If there are differences or practical significance be-tween reported test results for two laboratories,or more,comparative test should be performed to determine if there is astatistical bias,using competent statistical assistance.As aminimum,use test samples as homogeneous as possible,drawnfrom the material from which the disparate test results areobtained,and assigned randomly in equal numbers to eachlaboratory for testing.Other materials with established testvalues may be used for this purpose.Compare the test resultsfrom the two laboratories using a statistical test for unpaireddata at a probability level chosen prior to the testing series.Ifa bias is found,either its cause must be found and corrected,orfuture test results must be adjusted in consideration of theknown bias.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.11 on Cotton Fibers.Current edition approved July 1,2012.Published August 2012.Originallyapproved in 1961 T.Last previous edition approved in 2007 as D249507.DOI:10.1520/D2495-07R12.2For 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.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,PA 19428-2959.United States1 5.2 Information on the moisture content of cotton is desir-able since the physical properties of cotton are significantlyaffected by its moisture content.High moisture content in-creases flexibility,toughness,elongation,and tensile strength.Too high a moisture content causes difficulty in processing dueto the tendency of the stock to“lap-up”on drafting rolls.Lowmoisture,on the other hand,facilitates cleaning but increasesthe brittleness of the fiber and results in fiber breakage duringginning,cleaning,and mill processing.Low moisture alsoincreases fly waste and may cause manufacturing difficultiesdue to static electricity.5.3 Variations in th