Standard Practice for
Preparing Plastic Film Specimens for a Round-Robin Study1

This standard is issued under the fixed designation D 4204; 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 (e) 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.
NOTE 1—There is no similar or equivalent ISO standard.

2. Referenced Documents

2.1 ASTM Standards:
E 691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method2

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, n1 test specimens are tested to
produce a single test result in a short-time period, while replicate test
results are obtained over a longer time period. Thus, there are withinlaboratory 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 unit, 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.

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