ASTM_D_3025_-_07_2021.pdf

Designation:D302507(Reapproved 2021)Standard Practice forStandardizing Cotton Fiber Test Results by Use ofCalibration Cotton Standards1This standard is issued under the fixed designation D3025;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 practice covers the use of reference standardcottons for the standardization of instruments and techniquesused to test cotton fibers in various laboratories.1.2 Standardization may be achieved by application of acorrection factor based on the reference standards,or bymodification of the technique in use.NOTE1When reference standards are used to develop correctionfactors,or to adjust an operators technique,no instrument calibrationprocesses are involved.The term“Calibration”is properly used for theapplication or assignment of permanent scales or marks to an instrument.Adjustments can be made to specific instruments and accessories such asorifices,metallic strips,or cellophane sheets,in order to obtain theprescribed values with a specific instrument.Since an operators techniqueor the interpretation of a method or procedure is inherently variable,itcannot be calibrated,that is,assigned a permanent,definite value.The useof reference standards,however,affords a means for standardizingtechniques and checking the reliability of observed results.1.3 This practice recognizes two types of reference stan-dards:(1)calibration cotton standards(see 6.1)and(2)working cotton standards(see 6.2).1.4 The instructions included in this practice can be usedwith cotton fibers in any form suitable for testing with theparticular instrument to be used.1.5 The instructions in the practice are applicable to cottonfibers but can also be applied to specific blends of cotton andother fibers,or to other fibers that can be tested with theinstruments designed for testing cotton fibers.No informationis available,however,to show that test procedures standardizedwith reference cotton samples are equally reliable with variouscotton fiber blends or with other fibers.NOTE2Standardization procedures covered in this practice arerecommended for use with the following:Test Methods D1440,D1445,D1447,and D1448.1.6 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1440 Test Method for Length and Length Distribution ofCotton Fibers(Array Method)D1445 Test Method for Breaking Strength and Elongation ofCotton Fibers(Flat Bundle Method)D1447 Test Method for Length and Length Uniformity ofCotton Fibers by Photoelectric MeasurementD1448 Test Method for Micronaire Reading of Cotton Fi-bers(Withdrawn 2020)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:calibration cotton standard,reference standard,working cottonstandard.3.2 For all other terminology related to textiles,refer toTerminology D123.4.Summary of Practice4.1 Testing instruments are adjusted in accordance withengineering principles to ensure that they correspond properly1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.11 on Cotton Fibers.Current edition approved Jan.1,2021.Published January 2021.Originallyapproved in 1972.Last previous edition approved in 2023 as D302507(2012).DOI:10.1520/D3025-07R21.2For 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1to the manufacturers calibration scales