ISO/TS 4807:2022

TECHNICAL ISO/TS
SPECIFICATION 4807
First edition
2022-06
Reference materials for particle size
measurement — Specification of
requirements
Matériaux de référence pour la mesure de taille de particules —
Spécification des exigences
Reference number
© ISO 2022
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ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3  Terms and definitions . 1
4 Abbreviated terms . 4
5 Basic principles . 5
5.1 Measurand definitions in particle size analysis . 5
5.1.1 General . 5
5.1.2 Operationally defined measurands in particle characterisation: Equivalent
diameters . 5
5.1.3 Required detail of procedure description for operationally defined
measurands. 7
5.1.4 Conditions for equivalent diameters to coincide with the actual particle
diameter . 7
5.2 Metrological traceability of size measurement results . . 8
5.2.1 General . 8
5.2.2 Establishing versus verifying traceability in particle characterisation . 11
5.3 Types of RMs . 11
5.3.1 Certified and non-certified RMs/certified and non-certified values . 11
5.3.2 Primary/secondary/tertiary CRMs .12
5.3.3 Spherical/non-spherical and monodisperse/polydisperse RMs .13
5.4 Porous/dense RMs . . 14
6 Practical handling .14
7  Requirements for specific uses .14
7.1 General . 14
7.2 Instrument verification/design qualification . 14
7.3 Installation qualification . 14
7.3.1 General . 14
7.3.2 Type of material . 14
7.3.3 Kind of quantity of the assigned value . 15
7.3.4 Degree of homogeneity . 15
7.4 Calibration . 16
7.4.1 General . 16
7.4.2 Type of material . 16
7.4.3 Traceability of the certified values . 16
7.4.4 Kind of quantity of the certified property . 16
7.4.5 Uncertainty of the certified value . 17
7.5 Operational qualification/demonstration of proficiency . 17
7.5.1 General . 17
7.5.2 Type of material . 17
7.5.3 Kind of quantity of the certified property . 18
7.5.4 Uncertainty of certified values . 20
7.6 Statistical quality control/performance qualification . 20
7.6.1 General .20
7.6.2 Type of material .20
7.6.3 Kind of quantity .20
7.6.4 Degree of homogeneity . 21
7.7 Summary . 21
Bibliography .24
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
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on the ISO list of patent declarations received (see www.iso.org/patents).
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 24, Particle characterization including
sieving, Subcommittee SC 4, Particle characterization.
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
TECHNICAL SPECIFICATION ISO/TS 4807:2022(E)
Reference materials for particle size measurement —
Specification of requirements
1 Scope
This document is intended to support users of reference materials (RMs) for particle size analysis
to identify suitable RMs (certified or not) for their needs. In line with the focus on users, questions
on sample preparation that go beyond preparation of the sample as received by the user will not be
covered by this document.
This document describes the fundamental requirements that RMs (certified or not) for the
determination of particle size shall fulfil in order to be fit for a given purpose. The document is limited
to a description of the fundamental principles – the discussion whether a certain numerical value is fit
for purpose is beyond the scope of this document.
The scope of this document is limited to RMs (certified or not) in the form of particles. This document
does not deal with any other form of RMs, like calibration grids.
2 Normative references
There are no normative references in this document.
3  Terms and definitions
For the purposes of this document, the following terms and definitions 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
kind of quantity
aspect common to mutually comparable quantities
Note 1 to entry: The division of ‘quantity’ according to ‘kind of quantity’ is to some extent arbitrary.
EXAMPLE The quantities diameter, circumference, and wavelength are generally considered to be quantities
of the same kind, namely of the kind of quantity called length.
Note 2 to entry: Quantities of the same kind within a given system of quantities have the same quantity dimension.
However, quantities of the same dimension are not necessarily of the same kind.
[SOURCE: ISO/IEC Guide 99:2007, 1.2, modified — Note 3 to entry and EXAMPLES 2 and 3 have been
deleted.]
3.2
measurand
quantity intended to be measured
Note 1 to entry: The specification of a measurand requires knowledge of the kind of quantity (3.1), description of
the state of the phenomenon, body, or substance carrying the quantity, including any relevant component, and
the chemical entities involved.
[SOURCE: ISO/IEC Guide 99:2007, 2.3, modified — Notes 2 and 3 to entry and all the EXAMPLES have
been deleted.]
3.3
operationally defined measurand
method-defined measurand
measurand (3.2) that is defined by reference to a documented and widely accepted measurement
procedure to which only results obtained by the same proce
...