EN 16916:2024

SLOVENSKI STANDARD
01-februar-2025
Snovi iz izrabljenih avtomobilskih gum - Določanje specifičnih zahtev za vzorčenje
in ugotavljanje deleža vlage z uporabo sušilnika
Materials obtained from End of Life Tyres - Determination of specific requirements for
sampling and determination of moisture content using the oven-dry method
Materialien aus Altreifen - Bestimmung der spezifischen Anforderungen für die
Probenahme und Bestimmung des Feuchtegehaltes aus dem Ofen-Trockenverfahren
Matériaux obtenus à partir de pneus usagés non réutilisables (PUNR) - Détermination
des exigences spécifiques relatives à l’échantillonnage et détermination de la teneur en
humidité selon la méthode de séchage à l’étuve
Ta slovenski standard je istoveten z: EN 16916:2024
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.

EN 16916
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2024
EUROPÄISCHE NORM
ICS 13.030.50; 83.160.01 Supersedes CEN/TS 16916:2016
English Version
Materials obtained from End-of-Life Tyres - Determination
of specific requirements for sampling and determination of
moisture content using the oven-dry method
Matériaux obtenus à partir de pneus usagés non Materialien aus Altreifen - Bestimmung der
réutilisables (PUNR) - Détermination des exigences spezifischen Anforderungen für die Probenahme und
spécifiques relatives à l'échantillonnage et Bestimmung des Feuchtegehaltes aus dem Ofen-
détermination de la teneur en humidité selon la Trockenverfahren
méthode de séchage à l'étuve
This European Standard was approved by CEN on 6 October 2024.

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. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16916:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 4
5 Apparatus . 4
6 Preparation of the sampling plan and laboratory sample . 5
6.1 Principles of sampling . 5
6.1.1 General. 5
6.1.2 Sampling plan . 5
6.2 Sampling point and apparatus . 5
6.2.1 Sampling point for stocked materials . 5
6.2.2 Sampling point for production samples . 6
6.3 Determination of lot size . 7
6.3.1 Lot size for production . 7
6.3.2 Lot size of stocked material . 7
6.4 Size of a sample increment . 7
6.5 Number of increments . 7
6.5.1 Number of increments from production process . 7
6.5.2 Number of increments from stocked materials in big bags . 8
6.6 Storage and transport of laboratory sample(s) . 8
7 Procedure . 8
8 Calculation of moisture content . 9
9 Test report . 10
Bibliography . 11

European foreword
This document (EN 16916:2024) 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 European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2025 and conflicting national standards shall be
withdrawn at the latest by May 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes CEN/TS 16916:2016.
In comparison with CEN/TS 16916:2016, the following changes have been made:
— In 6.5.2, two apparatus for taking samples are shown (taking of an increment from the centre axis of
the big bag and taking of an increment by the side of the big bag);
— “Figure 3 – Screw” has been replaced by “Figure 3 – Sample collector (all-layer sampler type)”;
— “Figure 4 — Sampler” has been replaced by “Figure 4 — Sample collector (sampling lance)”;
— EN 14243-2, 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
has been included as a reference.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: 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 the United
Kingdom.
1 Scope
This document specifies a method for determining the total moisture content of materials obtained from
End-of-Life Tyres (ELT) by drying samples in an oven. The method is applicable to chips, granulates,
powders and textile derived from the treatment of End-of-Life Tyres.
This document is not intended for the determination of moisture content in steel wires.
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
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 14243-1 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/
4 Principle
The sample of material is dried at a temperature of 105 °C in natural air circulation until constant mass
is reached. The percentage of moisture is calculated from the loss in mass of the sample. The method
includes a procedure for the correction of buoyancy effects.
5 Apparatus
5.1 Drying oven, capable of being controlled at (105 ± 2) °C (see declaration of the manufacturer) and
with air ventilation between three and five times per hour.
The air velocity shall be such that the sample particles are not dislodged from their dish or tray (5.2).
5.2 Dishes or trays of non-corrodible and heat-resistant material and of such dimensions that they are
able to hold the total sample in the proportion of about 1 g of sample per 100 mm of surface area of the
dish or tray respectively or about 0,5 g per 100 mm for textile samples.
The surface of the dish or tray shall be such that the possibility to adsorption/absorption is minimized
(very clean and even surface).
5.3 Balance, capable of weighing the sample and dish or tray (5.2), as received, to the nearest 0,1 g.
6 Preparation of the sampling plan and laboratory sample
6.1 Principles of sampling
6.1.1 General
The main principle of sampling is to obtain a representative sample(s) from a lot of material from which
the moisture content shall be determined.
The objective of this procedure is to take samples in a way that is truly representative of the moisture
content of the material produced. There are two alternatives. The first alternative is to measure the
moisture content of a production sample, in a point as close as possible to the entrance point in the big
bag. The second alternative is to measure the moisture content from stored material.
It is important to handle as little as possible the samples, as this manipulation can strongly affect the
moisture content of the sample.
6.1.2 Sampling plan
A written sampling plan shall be prepared before samples are taken according to 6.2 to 6.6. The number
of increments shall be not less than the minimum number of increments specified in 6.5.
The sampling scheme shall contain, at least, the following information:
a) the name of the sampler, the place where the sample was taken and the date when it was taken;
b) a full identification of the laboratory sample (reference);
c) a full identification of the big-bag from which the sample was taken;
d) the type of storage condition (outdoor or indoor);
e) the mass of the laboratory sample (g);
f) the name and the volume of the sampling tool (ml);
g) the number and position of the primary portions within the big-bag;
h) the type of ELTs specified in the test programme;
i) a reference to this document;
j) the report on all the operating conditions not specified in this document, or any optional operations;
k) the report on any possible incidents that might have affected the representative nature of the sample.
6.2 Sampling point and apparatus
6.2.1 Sampling point for stocked materials
To give a laboratory sample having a mass of not less than 500 g, six sampling points for the collection of
sample increments shall be chosen for each material to be monitored.
Sampling shall be carried out taking the primary increments from different heights of a big bag. At least
three increments shall be taken at different heights as specified in 6.5:
— P1: At the top (approximately 20 cm from the surface);
— P2: In the middle;
— P3: At the bottom of the big-bag (approximately 20 cm from the bottom).
Dimensions in centimetres
Figure 1 — Position of increments for three portions
If it is not possible to take samples in the centre axis of big-bag (see Figure 1) then six increments shall
be taken on two opposite sides of the big bag at different heights (see Figure 2).

Figure 2 — Position of increments for six portions
Two apparatus for taking samples are shown in
...