ASTM D4204-12
(Practice)Standard Practice for Preparing Plastic Film Specimens for a Round-Robin Study
Standard Practice for Preparing Plastic Film Specimens for a Round-Robin Study
SIGNIFICANCE AND USE
4.1 This practice is intended to assist task groups participating in a round-robin study with the preparation of test sets of film specimens from film samples in the form of rolls on a core.
4.2 This practice assumes that the essential features of the round-robin protocol have already been established by following the guidance of Practice E691. In particular, it is assumed that the following are known: (1) the number of film samples to be used, (2) the number of participating laboratories, (3) the number of replicate test results to be generated by each laboratory for each sample, and (4) the number of test specimens required to yield one test result for each sample.
4.3 In accordance with this practice, samples are partitioned into test sets so that real within-sample variability will not unduly distort the conclusions drawn from statistical analyses of the data generated in the round-robin study.
SCOPE
1.1 This practice covers the preparation of test sets of plastic film specimens for subsequent use in an interlaboratory round-robin study to evaluate the precision of a test method.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.Note 1—There is no known ISO equivalent to this standard.
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Designation: D4204 − 12
StandardPractice for
1
Preparing Plastic Film Specimens for a Round-Robin Study
This standard is issued under the fixed designation D4204; 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.
1. Scope* 3.1.3 test result—the value (usually, the arithmetic average)
of the property derived from one test unit.
1.1 Thispracticecoversthepreparationoftestsetsofplastic
film specimens for subsequent use in an interlaboratory round-
3.1.4 test set—a group of several film specimens, in a
robin study to evaluate the precision of a test method.
number greater than that specified for a test unit.
1.2 This standard does not purport to address all of the
3.1.5 test specimen—the individual piece of film to be
safety concerns, if any, associated with its use. It is the
tested, usually of specified dimensions, that is to be cut from
responsibility of the user of this standard to establish appro-
one film specimen and tested, to produce one value of the
priate safety and health practices and determine the applica-
property, or properties, by the test method under study.
bility of regulatory limitations prior to use.
3.1.6 test unit—a specified number of film specimens from
NOTE 1—There is no known ISO equivalent to this standard.
which an equal number of test specimens is to be prepared and
tested in a short-time span to yield one test result for each
2. Referenced Documents
property.
2
2.1 ASTM Standards:
3.2 Abbreviations:
E691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method
RR = round-robin study
q = number of samples to be used in the RR
3. Terminology
r = total number of film assemblies that will be needed
3.1 Definitions of Terms Specific to This Standard:
for each lab to complete the necessary testing
3.1.1 film specimen—one piece of a sample obtained by
n = specified number of film specimens in a test unit
1
cutting across the width of the sample and to a length such that
n = number of additional film specimens in each test set
2
one test specimen can subsequently be prepared.
p = number of laboratories participating in the RR
1
p = number of additional “latent” laboratories provided
2
NOTE 2—For any sample in a laboratory, the specified number of film
for in the specimen preparation procedure
specimens in a test unit (n ) are tested to produce a single test result in a
1
short-time period, while replicate test results are obtained over a longer L = film-specimen length appropriate for preparing one
1
time period. Thus, there are within-laboratory components of variability
test specimen
for both short-term and long-term testing. This practice calls these
L = total length of film necessary to produce samples fro
2
within-day and between-day components of variability, inasmuch as
participating plus latent laboratories; L =(p + p )
2 1 2
round-robin protocols often specify that replicate test results be obtained
(L )
1
on different days.
SD = standard deviation for a single source of variability
3.1.2 sample—a quantity of film of a width appropriate to
for one given sample
the test method under study and of a length sufficient to yield
S = standard deviation for within-laboratory within-day
1
the total number of film specimens needed for the planned
variability of a test value
round-robin study.
S = standard deviation for within-laboratory variability of
2
a test result
1
This practice is under the jurisdiction ofASTM Committee D20 on Plastics and
S = standard deviation for between-laboratory variability
3
is the direct responsibility of Subcommittee D20.19 on Film, Sheeting, and Molded
of a test result
Products.
S = standard deviation for within-sample variability
Current edition approved Aug. 1, 2012. Published September 2012. Originally 4
S = standard deviation of a within-laboratory single test
approved in 1982. Last previous edition approved in 2006 as D4204 - 06. DOI:
r
10.1520/D4204-12.
result for one given sample on any day
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
S = standard deviation of a between-laboratory single test
R
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
result for one given sample on any day
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D4204 − 12
4. Significance and Use that appreciable systematic t
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D4204 − 06 D4204 − 12
Standard Practice for
1
Preparing Plastic Film Specimens for a Round-Robin Study
This standard is issued under the fixed designation D4204; 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.
1. Scope*
1.1 This practice covers the preparation of test sets of plastic film specimens for subsequent use in an interlaboratory
round-robin study to evaluate the precision of a test method.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
NOTE 1—There is no similar or equivalent ISO known ISO equivalent to this standard.
2. Referenced Documents
2
2.1 ASTM Standards:
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 film specimen—one piece of a sample obtained by cutting across the width of the sample and to a length such that one
test specimen can subsequently be prepared.
NOTE 2—For any sample in a laboratory, the specified number of film specimens in a test unit (n ) are tested to produce a single test result in a
1
short-time period, while replicate test results are obtained over a longer time period. Thus, there are within-laboratory components of variability for both
short-term and long-term testing. This practice calls these within-day and between-day components of variability, inasmuch as round-robin protocols often
specify that replicate test results be obtained on different days.
3.1.2 sample—a quantity of film of a width appropriate to the test method under study and of a length sufficient to yield the total
number of film specimens needed for the planned round-robin study.
3.1.3 test result—the value (usually, the arithmetic average) of the property derived from one test unit.
3.1.4 test set—a group of several film specimens, in a number greater than that specified for a test unit.
3.1.5 test specimen—the individual piece of film to be tested, usually of specified dimensions, that is to be cut from one film
specimen and tested, to produce one value of the property, or properties, by the test method under study.
3.1.6 test unit—a specified number of film specimens from which an equal number of test specimens is to be prepared and tested
in a short-time span to yield one test result for each property.
3.2 Abbreviations:
RR = round-robin study
q = number of samples to be used in the RR
r = total number of film assemblies that will be needed for each lab to complete the necessary testing
n = specified number of film specimens in a test unit
1
n = number of additional film specimens in each test set
2
p = number of laboratories participating in the RR
1
1
This practice is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.19 on Film, Sheeting, and Molded
Products.
Current edition approved Sept. 1, 2006Aug. 1, 2012. Published September 2006September 2012. Originally approved in 1982. Last previous edition approved in 20002006
as D4204 - 00.D4204 - 06. DOI: 10.1520/D4204-06.10.1520/D4204-12.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D4204 − 12
p = number of additional “latent” laboratories provided for in the specimen preparation procedure
2
L = film-specimen length appropriate for preparing one test specimen
1
L = total length of film necessary to produce samples fro participating plus latent laboratories; L = (p + p ) (L )
2 2 1 2 1
SD = standard deviation for a single source of variability for one given sample
S = standard deviation for within-laboratory within-day variability of a test value
1
S = standard deviation for within-laboratory variability of a test result
2
S
...
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