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International
Standard
ISO 19983
Third edition
Rubber — Determination of
2024-06
precision of test methods
Caoutchouc — Détermination de la fidélité des méthodes d'essai
Reference number
© ISO 2024
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 2
5 Interlaboratory test programme . 3
6 Procedures . 3
6.1 Application .3
6.2 Repeatability conditions .4
6.3 Day-to-day repeatability conditions .4
6.4 Reproducibility conditions .4
6.5 Testing elements .4
6.6 Planning .4
6.7 Methodology .5
6.7.1 Method A . . .5
6.7.2 Method B . .5
6.7.3 Method A versus Method B — Day-to-day repeatability value.6
6.7.4 Method A versus Method B — Number of replicates .6
6.8 Detection of outliers .6
6.9 Treatment of outliers .6
7 Report . 8
Annex A (normative) Calculations for Method A . 9
Annex B (normative) Calculations for Method B .12
Annex C (normative) Calculating the h and k values (Mandel's statistics) .13
Annex D (informative) Example of general precision determination .15
Annex E (informative) Guidance for using precision results .20
Annex F (informative) Example of outlier treatment for Method A .22
Annex G (informative) An example of outlier treatment for Method B .28
Bibliography .37
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
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The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee
SC 2, Testing and analysis.
This third edition cancels and replaces the second edition (ISO 19983:2022), which has been technically
revised.
The main changes are as follows:
— Annex F has been modified to provide an example of outlier treatment for Method A;
— previous Annex F has been changed to Annex G;
— a comparison of Method A and Method B is shown in 6.7.3 and 6.7.4.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
The procedures used for several years for estimating precision of test methods by means of interlaboratory
1)
tests (ISO/TR 9272 ) were closely related to ASTM D4483. ISO/TR 9272 was found to have serious flaws
which users were using work-arounds to counteract. This document has therefore been developed to
replace ISO/TR 9272 and includes using ISO 5725-1 and ISO 5725-2 with specific choices and variations of
procedures to suit the particular requirements of rubbers.
This document provides two methods for determining the precision values of a test method:
— Method A based on ISO 5725-1, ISO 5725-2 and ISO 5725-3 to calculate repeatability, day-to-day
repeatability, and reproducibility;
— Method B based on ASTM D4483 to calculate day-to-day repeatability and reproducibility.
1) Cancelled and replaced by ISO 19983:2017.
v
International Standard ISO 19983:2024(en)
Rubber — Determination of precision of test methods
1 Scope
This document provides guidelines and specifies requirements for estimating the precision of rubber test
methods by means of interlaboratory test programmes based on the procedures given in:
— Method A using ISO 5725-1, ISO 5725-2 and ISO 5725-3;
— Method B using ASTM D4483.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 3534-1, Statistics — Vocabulary and symbols — Part 1: General statistical terms and terms used in
probability
ISO 3534-2, Statistics — Vocabulary and symbols — Part 2: Applied statistics
ISO 5725-1:2023, Accuracy (trueness and precision) of measurement methods and results — Part 1: General
principles and definitions
ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method for
the determination of repeatability and reproducibility of a standard measurement method
ISO 5725-3, Accuracy (trueness and precision) of measurement methods and results — Part 3: Intermediate
measures of the precision of a standard measurement method
ASTM D4483, Standard Practice for Determining Precision for Test Method Standards in the Rubber and Carbon
Black Industries
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 3534-1, ISO 3534-2, ISO 5725-1,
ISO 5725-2, ISO 5725-3, ASTM D4483, and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
day-to-day repeatability
precision under the conditions where independent test results are obtained with the same method on
identical test items in the same laboratory by the same operator using the same equipment
Note 1 to entry: The time interval between repeated tests is normally between one and seven days.
3.2
type 1 precision
precision determined directly on a target material
Note 1 to entry: Prepared test pieces or test portions of the target material (class of elements) drawn from a
homogeneous source are tested, with no processing or other operations required prior to testing.
3.3
type 2 precision
precision determined indirectly for a target material
Note 1 to entry: The target material is usually combined with a number of homogeneous ancillary materials to form
a composite material and testing is conducted on samples of this and the property response of the target material is
determined.
3.4
pooled standard deviation
square root of the average variance of a set of selected individual variances
Note 1 to entry: The pooled standard deviation, as well as the average variance, is intended as an overall or general
descriptor of some set of variances and their standard deviations.
4 Symbols
D day-to-day effect, the day-to-day variance component of which is σ
ij D
h values Mandel’s between-laboratory consistency test statistic
k values Mandel’s within-laboratory consistency test statistic
L between-laboratory effect, the between-laboratory variance component of which is σ
i L
M repeatability effect, the repeatability variance component of which is σ
ijk M
n number of measurements
p number of laboratories
q number of days
r repeatability
r day-to-day repeatability as determined from method A calculations
DA
r day-to-day repeatability as de
...