ASTM D6674-01
(Guide)Standard Guide for Proficiency Test Program for Fabrics
Standard Guide for Proficiency Test Program for Fabrics
SIGNIFICANCE AND USE
Proficiency testing is a means of securing estimates of the variability of results obtained by different laboratories testing homogeneous materials taken from batch samples when following procedures prescribed in a specific test method.
4.1.1 For the purpose of this guide, homogeneous materials are considered to be laboratory samples cut from the same batch sample (roll or garment lot) and selected at random for the participant laboratories.
This proficiency test program is to be considered a full-scale interlaboratory test, in which a reasonably large number of laboratories participate by testing a series of materials using one or more operators per laboratory and report the data for analysis.
4.2.1 For the purposes of this guide, Full Scale Laboratory Test is defined in Practice D 2904. This is not to be confused with the full scale testing terminology and definitions which appear in other test methods, such as flammability, that describe the size of the specimens being tested.
The statistical data generated by this practice provide information needed to exhibit participation in a formal proficiency test study.
All data are submitted to the program coordinator at ASTM Headquarters for the preparation and distribution of the proficiency testing program reports. All laboratory data are confidential with no disclosure of lab identity except for each participant’own laboratory. Published reports contain all laboratory test data (coded), statistical analysis of test data, charts plotting test results versus lab code, and other information.
SCOPE
1.1 This guide outlines the Proficiency Test Program for Fabrics. 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 in this practice.
1.2 The planning of the proficiency test program requires a general knowledge of testing of textile fabrics and statistical principles included in the analysis of the data.
1.3 This guide is designed to meet the quality systems proficiency and competence requirements of participating laboratories. This program is not accredited to any international standard.
1.4 The instructions in this guide follow the logic of full scale laboratory tests as described in Practice D 2904 and Guide E 1301, except with this new guide placing its emphasis on proficiency testing.
1.5 Procedures given in this guide are applicable to methods based on the measurement of discrete measurement data and grades or scores.
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Standards Content (Sample)
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Designation: D 6674 – 01
Standard Guide for
Proficiency Test Program for Fabrics
This standard is issued under the fixed designation D 6674; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Proficiency testing is the use of interlaboratory test comparisons to determine the performance of
individual laboratories for specific tests and to monitor the consistency and comparability of a
laboratory’s test data.
Participation in proficiency testing programs provides laboratories with an objective means of
assessing and demonstrating the reliability of the data they are producing.Although there are several
types of proficiency testing programs, they all share the common feature of the comparison of test
results obtained by two or more laboratories.
One of the main uses of proficiency testing programs is to assess laboratories’ ability to perform
tests competently. This will involve the preparation of the test specimens, calibrating or validating the
testing equipment, performing the tests and reporting the data.
Bodies assessing the technical competence of testing laboratories normally require or expect
satisfactory participation in proficiency testing as evidence of a laboratory’s ability to produce reliable
test results.
1. Scope 2. Referenced Documents
1.1 This guide outlines the Proficiency Test Program for 2.1 ASTM Standards:
Fabrics. Elements for planning the proficiency test program, D 123 Terminology Relating to Textiles
selecting the sample fabrics to be used, the testing protocol, D 737 Test Method forAir Permeability of Textile Fabrics
and the calculations for the data to be reported are included in D 1230 Flammability of Apparel Fabrics, 16CFR 1610
this practice. D 2261 Test Method for Tearing Strength of Fabrics by the
1.2 The planning of the proficiency test program requires a Tongue (Single Rip) Procedure Constraint Rate of Exten-
general knowledge of testing of textile fabrics and statistical sion (CRE) Tensile Testing Machine
principles included in the analysis of the data. D 2904 Practice for Interlaboratory Testing of Textiles that
1.3 This guide is designed to meet the quality systems Produces Normally Distributed Data
proficiencyandcompetencerequirementsofparticipatinglabo- D 2906 Statements on Precision and Bias for Textiles
ratories. This program is not accredited to any international D 3775 Test Method for Fabric Count of Woven Fabric
standard. D 5034 Test Method for Breaking Strength and Elongation
1.4 The instructions in this guide follow the logic of full of Textile Fabrics (Grab Test)
scale laboratory tests as described in Practice D 2904 and D 5035 Test Method for Breaking Force and Elongation of
Guide E 1301, except with this new guide placing its emphasis Textile Fabrics (Strip Method)
on proficiency testing. D 6545 Flammability of Textiles Used in Children’s Sleep-
1.5 Procedures given in this guide are applicable to methods wear
based on the measurement of discrete measurement data and
grades or scores.
This guide is under the jurisdiction of ASTM Committee D13 on Textiles and
is the direct responsibility of Subcommittee D13.60 on Fabric Test Methods,
Specific. Annual Book of ASTM Standards,Vol 07.01.
Current edition approved May 10, 2001. Published August 2001. Annual Book of ASTM Standards,Vol 07.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D6674–01
E 1301 Guide for Proficiency Testing by Interlaboratory 3.2.12 specimen, n—a specific portion of a material or a
Comparisons laboratory sample upon which a test is performed or which is
selected for that purpose.
3. Terminology 3.2.13 test result, n—a value obtained by applying a given
test method, expressed as a single determination or a specified
3.1 Fordefinitionsoftextileandstatisticaltermsusedinthis
combination of a number of determinations.
practice, and discussions of their use, refer to Terminology
3.2.14 testing laboratory, n—laboratory that performs tests
D 123 and appropriate textbooks on statistics.
(including calibration) (also referred to as “participating labo-
3.2 Definitions—The relevant definitions are from Termi-
ratory,” or just “laboratory”).
nology D 123, and are the most relevant and applicable being
quoted for the purposes of this practice.
4. Significance and Use
3.2.1 accuracy, n—of a test method, the degree of agree-
ment between the true value of the property being tested (or
4.1 Proficiency testing is a means of securing estimates of
accepted standard value) and the average of many observations
the variability of results obtained by different laboratories
made according to the test method, preferably by many
testinghomogeneousmaterialstakenfrombatchsampleswhen
observers. D 2906
following procedures prescribed in a specific test method.
3.2.2 batch sample, n—the material(s) used for the profi-
4.1.1 For the purpose of this guide, homogeneous materials
ciency test study taken from a common roll or garment lot and
are considered to be laboratory samples cut from the same
distributed to the participants.
batch sample (roll or garment lot) and selected at random for
3.2.3 bias, n—in statistics, a constant or systematic error in
the participant laboratories.
test results.
4.2 This proficiency test program is to be considered a
3.2.4 calibrate, n—to determine and record the relationship
full-scale interlaboratory test, in which a reasonably large
between a set of standard units of measure and the output of an
number of laboratories participate by testing a series of
instrument or test procedure.
materialsusingoneormoreoperatorsperlaboratoryandreport
3.2.5 precision, n—the degree of agreement within a set of
the data for analysis.
observations or test results obtained as directed in a method.
4.2.1 For the purposes of this guide, Full Scale Laboratory
3.2.5.1 Discussion—The term “precision,” delimited in
Test is defined in Practice D 2904. This is not to be confused
various ways, is used to describe different aspects of precision.
with the full scale testing terminology and definitions which
This usage was chosen in preference to the use of “repeatabil-
appear in other test methods, such as flammability, that
ity” and “reproducibility.”
describe the size of the specimens being tested.
3.2.6 precision, n—under conditions of between-laboratory
4.3 The statistical data generated by this practice provide
precision, the multi-laboratory single sample, single operator-
information needed to exhibit participation in a formal profi-
apparatus-day (within laboratory) precision of a method; the
ciency test study.
precision of a set of statistically independent test results all of
4.4 All data are submitted to the program coordinator at
which are obtained by testing the same sample of material and
ASTM Headquarters for the preparation and distribution of the
each of which is obtained in a different laboratory by one
proficiency testing program reports. All laboratory data are
operator using one apparatus to obtain the same number of
confidential with no disclosure of lab identity except for each
observations by testing randomly drawn specimens over the
participant’s own laboratory. Published reports contain all
shortest practical time interval. For a more detailed definition,
laboratory test data (coded), statistical analysis of test data,
refer to D 2906.
charts plotting test results versus lab code, and other informa-
3.2.7 proficiency testing, n—determination of the laboratory
tion.
testing performance by means of interlaboratory comparisons.
3.2.8 program coordinator, n—theperson(s)responsiblefor
5. Materials to be Used in Study
management of all logistical issues, data collection, and report
5.1 Mechanical Testing Program—Three types of materials
preparation.
aretobeincludedinthestudy.Thematerialsshallbedescribed
3.2.9 repeatability, n—in statistics, the distribution of sev-
as light, medium and heavy as defined by the breaking
eral measurements on the same part by one operator with the
strengths. The materials to be used for this study shall be
same gage.
selected by the Subcommittee D13.93 with assistance from
3.2.10 reproducibility, n—in statistics, the distribution of
participant laboratories and pertinent subcommittees. An ac-
several measurements on the same part by several operators
credited laboratory selected by the Subcommittee D13.93 shall
with the same gage.
act as host and maintain these materials. The host laboratory
3.2.11 sample, n—(1) a portion of material which is taken
shall not be held responsible for the performance of the test
for testing or record purposes. (2) a group of specimens used,
materials at the participant laboratories.
orofobservationsmade,whichprovideinformationthatcanbe
5.2 Flammability Test Program—At least seven types of
used for making statistical inferences about the population(s)
fabrics are to be available for the study, not all of which will be
from which the specimens are drawn.
used at the same time.The materials shall be described by fiber
type, construction type (woven, knit, nonwoven), surface
characteristicsandfabricweightasdefinedbytheflam
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