EN 16916:2024

Materials obtained from End-of-Life Tyres - Determination of specific requirements for sampling and determination of moisture content using the oven-dry method

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.

Materialien aus Altreifen - Bestimmung der spezifischen Anforderungen für die Probenahme und Bestimmung des Feuchtegehaltes aus dem Ofen-Trockenverfahren

Dieses Dokument legt ein Verfahren zur Bestimmung des Gesamtfeuchtegehaltes von Materialien aus Altreifen (ELT, en: End-of-Life Tyres) durch das Trocknen von Proben in einem Ofen fest. Das Verfahren ist anwendbar für Schnitzel, Granulate, Pulver und Textilien, die aus der Verarbeitung von Altreifen stammen.
Dieses Dokument ist nicht für die Bestimmung des Feuchtegehaltes von Stahldrähten vorgesehen.

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

Le présent document spécifie une méthode permettant de déterminer la teneur en humidité totale de matériaux obtenus à partir de pneus usagés non réutilisables (PUNR) en séchant des échantillons dans une étuve. La méthode s'applique aux chips, granulats, poudrettes et textiles issus du traitement de pneus usagés non réutilisables.
Le présent document ne concerne pas la détermination de la teneur en humidité des fils d'acier.

Snovi iz izrabljenih avtomobilskih gum - Določanje specifičnih zahtev za vzorčenje in ugotavljanje deleža vlage z uporabo sušilnika

Ta dokument določa metodo za ugotavljanje skupnega deleža vlage v snoveh, pridobljenih iz izrabljenih avtomobilskih gum (ELT), s sušenjem vzorcev v sušilniku. Ta metoda se uporablja za odrezke, granule, praške in tekstil, pridobljene pri obdelavi izrabljenih avtomobilskih gum.
Ta dokument se ne uporablja za določevanje deleža vlage v jeklenih žicah.

General Information

• Status: Published
• Publication Date: 26-Nov-2024
• ICS: 13.030.50 - Recycling
• ICS: 83.160.01 - Tyres in general
• Technical Committee: CEN/TC 366 - Project Committe - Tyre recycling
• Drafting Committee: CEN/TC 366/WG 3 - Composition characteristics
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 27-Nov-2024
• Due Date: 16-Dec-2024
• Completion Date: 27-Nov-2024
• Ref Project: SIST EN 16916:2025 - Materials obtained from End of Life Tyres - Determination of specific requirements for sampling and determination of moisture content using the oven-dry method

Relations

• Replaces: CEN/TS 16916:2016 - Materials obtained from End of Life Tyres - Determination of specific requirements for sampling and determination of moisture content using the oven-dry method
• Effective Date: 18-Jan-2023

Overview

EN 16916:2024 (CEN) defines specific requirements for sampling and for the determination of total moisture content in materials obtained from End‑of‑Life Tyres (ELT) using the oven‑dry method. Applicable materials include chips, granulates, powders and textile fractions recovered from ELT treatment. The method dries samples at controlled temperature until constant mass is reached and includes a correction for buoyancy effects. This standard supersedes CEN/TS 16916:2016 and was approved by CEN in October 2024.

Key topics and technical requirements

• Scope and exclusions
  • Applies to ELT‑derived chips, granulates, powders and textiles.
  • Does not cover moisture determination in steel wires.
• Reference method
  • Drying in an oven at 105 ± 2 °C with natural air circulation until constant mass.
  • Use of a reference dish/tray for buoyancy correction and reweighing while still hot to avoid atmospheric re‑absorption.
• Apparatus and measurements
  • Oven with ventilation 3–5 air changes per hour and air velocity low enough to avoid dislodging particles.
  • Non‑corrodible, heat‑resistant dishes/trays sized to hold the full sample (specified sample per surface area for bulk and textile).
  • Balance with precision to 0.1 g.
• Sampling plan and laboratory sample
  • A written sampling plan is mandatory and must record sampler, sampling point, big‑bag ID, storage conditions, sample mass, sampling tool and any incidents.
  • Minimum laboratory sample mass typically ≥ 500 g.
  • For stocked material in big bags: take increments at top, middle and bottom (P1, P2, P3) or six increments from opposing sides when center access is impossible.
  • For production sampling: use a sampling box that intercepts the full flow; automatic systems allowed if equivalent.
  • Increment sizes and minimum number of increments are based on material type, nominal top size and lot mass-see the standard for calculation rules.
• Storage and transport
  • Store samples in tight containers and dry conditions to avoid moisture change.

Applications and users

• Who uses EN 16916:2024:
  • ELT recyclers and processors, quality control laboratories, material suppliers, product specifiers and compliance auditors.
• Typical uses:
  • Quality control of granulates, powders and textile fractions for resale or reuse.
  • Verifying drying performance and conditioning before use in downstream applications (e.g., rubber compounds, civil engineering fill).
  • Contract testing and producer/customer acceptance testing.

Related standards

• EN 14243‑1 (definitions for ELT materials)
• EN 14243‑2 (particle size distribution and impurity methods referenced)
• Supersedes: CEN/TS 16916:2016

Keywords: EN 16916:2024, moisture content, oven‑dry method, End‑of‑Life Tyres, ELT sampling, granulates, powders, textile, CEN, big bag sampling.

Standards Content (Sample)

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,
...