prEN 17189

SLOVENSKI STANDARD
01-februar-2024
Snovi iz izrabljenih avtomobilskih gum (ELT) - Določanje prave gostote granulatov
in praškov - Metoda, ki temelji na vodni piknometriji
Materials obtained from end of life tyres (ELT) - Determination of the true density of
granulates and powders - Method based on water pycnometry
Materialien aus Altreifen (ELTs) - Bestimmung der tatsächlichen Dichte von Granulaten -
Methode auf der Grundlage von Wasser-Pyknometrie
Matériaux obtenus à partir de pneus usagés non réutilisables (PUNR) - Détermination de
la densité vraie des granulats et des poudrettes - Méthode basée sur la pycnométrie à
eau
Ta slovenski standard je istoveten z: prEN 17189
ICS:
13.030.50 Recikliranje Recycling
83.160.01 Avtomobilske pnevmatike na Tyres in general
splošno
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2023
ICS Will supersede CEN/TS 17189:2018
English Version
Materials obtained from end of life tyres (ELT) -
Determination of the true density of granulates and
powders - Method based on water pycnometry
Materialien aus Altreifen (ELTs) - Bestimmung der
tatsächlichen Dichte von Granulaten - Methode auf der
Grundlage von Wasser-Pyknometrie
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 366.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17189:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Principle . 5
5 Apparatus . 6
5.1 Scales . 6
5.2 Pycnometer . 6
5.3 Vacuum chamber . 6
6 Preparation . 6
6.1 Sample preparation . 6
6.2 Surfactant solution . 7
7 Procedure for rubber granulates . 7
7.1 Method . 7
7.2 Preparation of pycnometer and sample . 7
7.3 Removal of trapped air . 7
7.4 Filling of pycnometer. 7
8 Expression of results . 8
9 Test report . 9
Annex A (normative) Specific method for ELT rubber powder. 10
Bibliography . 11

European foreword
This document (prEN 17189:2023) has been prepared by Technical Committee CEN/TC 366 “Materials
obtained from End-of-Life Tyres (ELT)”, the secretariat of which is held by UNI.
This document is currently submitted to the CEN Enquiry.
This document will supersede CEN/TS 17189:2018.
CEN/TS 17189:2018:
— addition of a sampling method for powders in the Title and Scope;
— revision of the used terminology to integrate powders;
— review of the general structure of the document.

Introduction
True density is a key measurement for product characterization of size-reduced materials such as
granulates and powders. This document defines a specific method for granulates and powders
considering that, to obtain an accurate value of true density, a representative sample of the material to
be tested has to be taken according to the principle that every particle of the sample that represents the
lot will have an equal probability of being included in the sample.
Sampling criteria to assess characteristics of granulates and powders at various stages of a production
process by size reduction of end-of-life tyres are given in EN 14243-2:2019, Clause 5.
Measurement of true density could be useful to identify the nature of particles of different origin, for
example, when a customer needs to check if he received granular material derived from End-of-
Life Tyres (ELTs) or from products based on EPDM polymers. True density is different between these
two products and could be reliable element to discriminate.
Typical values are:
— ELT granulates: 1,12 – 1,22;
— EPDM granulates: 1,4 – 1,6.
1 Scope
This document sets out methods and test protocols used to determine the true density of granulates and
powders produced from ELTs, based on water pycnometry.
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.
EN 14243-1, Materials obtained from end of life tyres — Part 1: General definitions related to the methods
for determining their dimension(s) and impurities
EN 14243-2:2019, Materials obtained from end of life tyres — Part 2: Granulates and powders — Methods
for determining the particle size distribution and impurities, including free steel and free textile content
CEN/TS 17188, Materials obtained from end of life tyres (ELT) — Sampling method for granulates and
powders stored in big-bags
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 14243-1 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
true density
ratio between the mass of a certain volume of the substance at a given temperature T and the mass of
same
...