1、Designation:D302507(Reapproved 2012)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 r
2、evision,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 te
3、chniquesused 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
4、 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 orde
5、r 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 standardizingtech
6、niques 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
7、 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 ava
8、ilable,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.
9、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 consult andestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2.Refere
10、nced 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 ofCott
11、on Fibers by Photoelectric MeasurementD1448 Test Method for Micronaire Reading of Cotton Fi-bersD7139 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 cott
12、on 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 properlyto the manufacturers calibration
13、scales and instructions for theoperation of the instrument.4.2 Technicians are instructed to operate testings instru-ments in a consistent manner utilizing appropriate prescribedASTM methods.4.3 Specimens of the working cotton standard or calibrationcotton standard are tested before and periodically
14、 during theroutine testing of cotton samples using the same techniques forall specimens tested.1This practice is under the jurisdiction ofASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.11 on Cotton Fibers.Current edition approved July 1,2012.Published August 2012.
15、Originallyapproved in 1972.Last previous edition approved in 2007 as D302507.DOI:10.1520/D3025-07R12.2For 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 Docume
16、nt Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.4 Observed values for samples tested are adjusted throughuse of a correction factor calculated from observed valuesobtained on reference standards to secure comparative level ofmeasurement.5.Significance and Use5.1 The purpose of this practice is to provide guidingprinciples for the use of reference standard cottons for thestandardization of instrumen
