1、Designation: D 6674 01 (Reapproved 2009)Standard Guide forProficiency Test Program for Fabrics1This standard is issued under the fixed designation D 6674; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A
2、 number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.INTRODUCTIONProficiency testing is the use of interlaboratory test comparisons to determine the performance ofindividual laboratories for specific
3、 tests and to monitor the consistency and comparability of alaboratorys test data.Participation in proficiency testing programs provides laboratories with an objective means ofassessing and demonstrating the reliability of the data they are producing. Although there are severaltypes of proficiency t
4、esting programs, they all share the common feature of the comparison of testresults obtained by two or more laboratories.One of the main uses of proficiency testing programs is to assess laboratories ability to performtests competently. This will involve the preparation of the test specimens, calibr
5、ating or validating thetesting equipment, performing the tests and reporting the data.Bodies assessing the technical competence of testing laboratories normally require or expectsatisfactory participation in proficiency testing as evidence of a laboratorys ability to produce reliabletest results.1.
6、Scope1.1 This guide outlines the Proficiency Test Program forFabrics. Elements for planning the proficiency test program,selecting the sample fabrics to be used, the testing protocol,and the calculations for the data to be reported are included inthis practice.1.2 The planning of the proficiency tes
7、t program requires ageneral knowledge of testing of textile fabrics and statisticalprinciples included in the analysis of the data.1.3 This guide is designed to meet the quality systemsproficiency and competence requirements of participating labo-ratories. This program is not accredited to any inter
8、nationalstandard.1.4 The instructions in this guide follow the logic of fullscale laboratory tests as described in Practice D 2904 andGuide E 1301, except with this new guide placing its emphasison proficiency testing.1.5 Procedures given in this guide are applicable to methodsbased on the measureme
9、nt of discrete measurement data andgrades or scores.2. Referenced Documents2.1 ASTM Standards:2D 123 Terminology Relating to TextilesD 737 Test Method for Air Permeability of Textile FabricsD 1230 Test Method for Flammability of Apparel TextilesD 2261 Test Method for Tearing Strength of Fabrics by t
10、heTongue (Single Rip) Procedure (Constant-Rate-of-Extension Tensile Testing Machine)D 2904 Practice for Interlaboratory Testing of a Textile TestMethod that Produces Normally Distributed DataD 2906 Practice for Statements on Precision and Bias forTextiles3D 3775 Test Method for Warp (End) and Fillin
11、g (Pick)Count of Woven FabricsD 5034 Test Method for Breaking Strength and Elongationof Textile Fabrics (Grab Test)D 5035 Test Method for Breaking Force and Elongation ofTextile Fabrics (Strip Method)D 6545 Test Method for Flammability of Textiles Used inChildrens Sleepwear31This guide is under the
12、jurisdiction of ASTM Committee D13 on Textiles andis the direct responsibility of Subcommittee D13.60 on Fabric Test Methods,Specific.Current edition approved Jan. 15, 2009. Published March 2009. Originallyapproved in 2001. Last previous edition approved in 2001 as D 667401.2For referenced ASTM stan
13、dards, 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.3Withdrawn. The last approved version of this historical standard is referencedon www.
14、astm.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.E 1301 Guide for Proficiency Testing by InterlaboratoryComparisons3. Terminology3.1 For definitions of textile and statistical terms used in thispractice, and discussions of th
15、eir use, refer to TerminologyD 123 and appropriate textbooks on statistics.3.2 DefinitionsThe relevant definitions are from Termi-nology D 123, and are the most relevant and applicable beingquoted for the purposes of this practice.3.2.1 accuracy, nof a test method, the degree of agree-ment between t
16、he true value of the property being tested (oraccepted standard value) and the average of many observationsmade according to the test method, preferably by manyobservers. D 29063.2.2 batch sample, nthe material(s) used for the profi-ciency test study taken from a common roll or garment lot anddistri
17、buted to the participants.3.2.3 bias, nin statistics, a constant or systematic error intest results.3.2.4 calibrate, nto determine and record the relationshipbetween a set of standard units of measure and the output of aninstrument or test procedure.3.2.5 precision, nthe degree of agreement within a
18、 set ofobservations or test results obtained as directed in a method.3.2.5.1 DiscussionThe term “precision,” delimited invarious ways, is used to describe different aspects of precision.This usage was chosen in preference to the use of “repeatabil-ity” and “reproducibility.”3.2.6 precision, nunder c
19、onditions of between-laboratoryprecision, the multi-laboratory single sample, single operator-apparatus-day (within laboratory) precision of a method; theprecision of a set of statistically independent test results all ofwhich are obtained by testing the same sample of material andeach of which is o
20、btained in a different laboratory by oneoperator using one apparatus to obtain the same number ofobservations by testing randomly drawn specimens over theshortest practical time interval. For a more detailed definition,refer to D 2906.3.2.7 proficiency testing, ndetermination of the laboratorytestin
21、g performance by means of interlaboratory comparisons.3.2.8 program coordinator, nthe person(s) responsible formanagement of all logistical issues, data collection, and reportpreparation.3.2.9 repeatability, nin statistics, the distribution of sev-eral measurements on the same part by one operator w
22、ith thesame gage.3.2.10 reproducibility, nin statistics, the distribution ofseveral measurements on the same part by several operatorswith the same gage.3.2.11 sample, n(1) a portion of material which is takenfor testing or record purposes. (2) a group of specimens used,or of observations made, whic
23、h provide information that can beused for making statistical inferences about the population(s)from which the specimens are drawn.3.2.12 specimen, na specific portion of a material or alaboratory sample upon which a test is performed or which isselected for that purpose.3.2.13 test result, na value
24、obtained by applying a giventest method, expressed as a single determination or a specifiedcombination of a number of determinations.3.2.14 testing laboratory, nlaboratory that performs tests(including calibration) (also referred to as “participating labo-ratory,” or just “laboratory”).4. Significan
25、ce and Use4.1 Proficiency testing is a means of securing estimates ofthe variability of results obtained by different laboratoriestesting homogeneous materials taken from batch samples whenfollowing procedures prescribed in a specific test method.4.1.1 For the purpose of this guide, homogeneous mate
26、rialsare considered to be laboratory samples cut from the samebatch sample (roll or garment lot) and selected at random forthe participant laboratories.4.2 This proficiency test program is to be considered afull-scale interlaboratory test, in which a reasonably largenumber of laboratories participat
27、e by testing a series ofmaterials using one or more operators per laboratory and reportthe data for analysis.4.2.1 For the purposes of this guide, Full Scale LaboratoryTest is defined in Practice D 2904. This is not to be confusedwith the full scale testing terminology and definitions whichappear in
28、 other test methods, such as flammability, thatdescribe the size of the specimens being tested.4.3 The statistical data generated by this practice provideinformation needed to exhibit participation in a formal profi-ciency test study.4.4 All data are submitted to the program coordinator atASTM Headq
29、uarters for the preparation and distribution of theproficiency testing program reports. All laboratory data areconfidential with no disclosure of lab identity except for eachparticipants own laboratory. Published reports contain alllaboratory test data (coded), statistical analysis of test data,char
30、ts plotting test results versus lab code, and other informa-tion.5. Materials to be Used in Study5.1 Mechanical Testing ProgramThree types of materialsare to be included in the study. The materials shall be describedas light, medium and heavy as defined by the breakingstrengths. The materials to be
31、used for this study shall beselected by the Subcommittee D13.93 with assistance fromparticipant laboratories and pertinent subcommittees. An ac-credited laboratory selected by the Subcommittee D13.93 shallact as host and maintain these materials. The host laboratoryshall not be held responsible for
32、the performance of the testmaterials at the participant laboratories.5.2 Flammability Test ProgramAt least seven types offabrics are to be available for the study, not all of which will beused at the same time. The materials shall be described by fibertype, construction type (woven, knit, nonwoven),
33、 surfacecharacteristics and fabric weight as defined by the flammabilitycharacteristics. The fabrics to be used for this study shall beselected by the Subcommittee D13.93. An accredited labora-tory selected by the Subcommittee D13.93 shall act as the hostand maintain these fabrics. The host laborato
34、ry shall not beD 6674 01 (2009)2held responsible for the performance of the materials at theparticipant laboratories.6. Distribution of Test Materials6.1 The proficiency test program is designed for the testmaterials to be distributed at a minimum two times eachcalendar yearFebruary and August. Each
35、 participating labo-ratory shall apply throughASTM Headquarters for inclusion inthe program.6.2 The materials will be distributed by having the hostlaboratory cut fabric samples from each batch roll or garmentlot. The samples will be identified, labeled and mailed to eachparticipating laboratory. AS
36、TM Headquarters will providedetailed instruction sheets and mailing labels to the hostlaboratory.6.3 Instructions for testing, recording data and return; formsand fabric samples will be mailed together as instructed.7. Selection of Test Methods7.1 For Mechanical TestingThe test methods shall beselec
37、ted and monitored by the Subcommittee D13.93. Theprotocol of this guide may not include the entire scope ofmethods used for testing fabric, but will include at least onemechanical test from the fields used to define woven fabricproperties such as construction, air permeability and strength.Other met
38、hods may be added or deleted as directed by D13.93with input from ASTM staff, participating laboratories, andpertinent Sub-Committee.7.1.1 The methods to be used for this guide are as follows:D 737 Air Permeability of Textile FabricsD 2261 Tearing Strength By Tongue Method (CRE Type Instrument)D 377
39、5 Fabric Count of Woven FabricD 5034 Breaking Strength and Elongation of Textile Fabrics (GrabTest)D 5035 Breaking Strength and Elongation of Textile Fabrics (StripTest)7.2 For Flammability TestingThe test methods shall beselected and monitored by the subcommittee D13.93. Theprotocol of this guide m
40、ay not include the entire scope ofmethods used for testing fabrics, but will include at least oneflammability test from the fields used to define characteristicsof the end use product.NOTE 1D13.52 is preparing two additional testing protocols to beused in conjunction with the flammability tests. The
41、 criteria are beingestablished for lab personnel to identify the types of product being testedand a comprehensive exam for the scope of testing.7.2.1 The methods to be used for this guide are as follows:D 1230 Flammability of Apparel FabricsD 6545 Flammability of Textiles Used in Childrens Sleepwear
42、8. Sampling8.1 Sampling of MaterialsThe host laboratory shall allo-cate enough material to provide for all participating laborato-ries to perform the complete scope of testing for the program.8.2 Numbers of DeterminationsEach participating labshall prepare the test specimens and number of determinat
43、ions(replicates) as directed by the proficiency testing program.9. Data Reporting9.1 All data shall be reported as instructed using the formssupplied with the material package.9.2 Outlying ObservationsAll data shall be reported.Exceptions to this general policy should be made only whenassignable cau
44、ses for deletion of a test value are present. Incases where there is no assignable cause for a test value beingout of line, the test value shall be retained and reported.10. Report10.1 Table of Results pages provides a listing of laboratorieswith corresponding test results. Each laboratory is identi
45、fied bya randomly selected code with the same laboratory codeapplying throughout the entire report. To maintain confidenti-ality of test data, the identification of lab codes will not bereleased from ASTM. Therefore, program participants will beable to identify only their own test data. The laborato
46、ryidentification code may change with subsequent reports. Eachtable page contains a heading identifying the method and testfabric.10.2 Lab Average column contains the lab average asreported to ASTM by the participating laboratories.10.3 The Lab Range column represents the difference be-tween the lab
47、s lowest and highest of the raw data results.10.4 Description of Z-Score ColumnThe Z-Score column(comparable to the Students t statistic) reports each labsdeviation in units of standard deviations. The Z Score is thecalculated number of standard deviations a sample mean isabove or below the populati
48、on mean. The criteria for the ZScores will be as follows:Z 3 = unsatisfactoryZ-Scores outside this range should occur only about one timein twenty, if a laboratory has average capability running themethod. Laboratories should strive to obtain Z Score valuesclose to zero. The Z-Score is calculated as
49、 follows:Z Score 5lab average total average! / total standard deviation10.5 Identification of Outlier DataDuring the analyticalreview of the data it was observed that when including all datain the calculation of the Overall Average and Std. Deviation, insome cases, the averages and standard deviations are adverselyaffected by outlier data. Therefore, through two iterations ofcalculations, labs who had a Z-Score Value of 6 3 or greaterhave been asterisked in the table. These data, while stillincluded in the tables, have not been included in the
