1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Materials obtained from end of life tyres (ELT) - Determination of the true density of granulates - Method based on water pycnometryPD CEN/TS 17189:2018TECHNICAL SPECIFICATIONSPCIFICATION TECHNIQUE TECHNISCHE SPEZIFIKAT
2、IONCEN/TS 17189 June 2018ICS 13.030.50; 83.160.01EnglishVersionMaterials obtained from end of life tyres (ELT) - Determination of the true density of granulates - Method based on water pycnometryMatriaux obtenus partirde pneus usags nonrutilisables (PUNR) - Dtermination de la densit vraie desgranula
3、ts - Mthode base sur la pycnomtrie eauMaterialien aus Altreifen (ELTs) - Bestimmung dertatschlichen Dichte von Granulaten -Methode auf derGrundlage von Wasser-PyknometrieThis Technical Specification(CEN/TS) was approved by CEN on2 March 2018 for provisional application.The period of validity of this
4、 CEN/TS is limited initially tothree years.After twoyears the members of CEN will be requested tosubmit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.CEN members are required to announce the existence of this CEN/TS in the same way as foran
5、 EN and to make the CEN/TSavailable promptly atnational level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.CEN members are the nationals
6、tandards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia,Sl
7、ovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CEN All rights of exploitation in any form and by any me
8、ans reservedworldwide for CENnational Members.Ref. No. CEN/TS 17189:2018 ENational forewordThis Published Document is the UK implementation of CEN/TS 17189:2018.The UK participation in its preparation was entrusted to Technical Committee PRI/73, Industrial rubber products.A list of organizations rep
9、resented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0
10、580 51120 2ICS 13.030.50; 83.160.01Compliance with a British Standard cannot confer immunity from legal obligations. This Published Document was published under the authority of the Standards Policy and Strategy Committee on 30 June 2018.Amendments/corrigenda issued since publicationDate Text affect
11、edPUBLISHED DOCUMENTPD CEN/TS 17189:2018TECHNICAL SPECIFICATION SPCIFICATION TECHNIQUE TECHNISCHE SPEZIFIKATION CEN/TS 17189 June 2018 ICS 13.030.50; 83.160.01 English Version Materials obtained from end of life tyres (ELT) - Determination of the true density of granulates - Method based on water py
12、cnometry Matriaux obtenus partir de pneus usags non rutilisables (PUNR) - Dtermination de la densit vraie des granulats - Mthode base sur la pycnomtrie eau Materialien aus Altreifen (ELTs) - Bestimmung der tatschlichen Dichte von Granulaten - Methode auf der Grundlage von Wasser-Pyknometrie This Tec
13、hnical Specification (CEN/TS) was approved by CEN on 2 March 2018 for provisional application. The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their comments, particularly on the question whether the CEN/TS can
14、 be converted into a European Standard. CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to
15、 the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Gr
16、eece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE F
17、R NORMUNG CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. CEN/TS 17189:2018 EPD CEN/TS 17189:2018CEN/TS 17189:2018 (E) 2 Contents Page European foreword . 3 Int
18、roduction 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 Procedure. 6 6.1 Sampling . 6 6.2 Method 6 7 Expression of results 7 8 Test report . 8 Bibliography 9 PD CEN/TS 17189:2018CEN/TS 17189
19、:2018 (E) 3 European foreword This document (CEN/TS 17189:2018) 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. Attention is drawn to the possibility that some of the elements of this document may be the
20、subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria
21、, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland
22、, Turkey and the United Kingdom. PD CEN/TS 17189:2018CEN/TS 17189:2018 (E) 4 Introduction True density is a key measurement for product characterization of size-reduced materials such as granulates. This Technical Specification defines a specific method for granulates taking into account that, to ob
23、tain 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 characteristic
24、s of granulates and powders at different stages of a production process by size reduction of end-of-life tyres are given in prEN 14243-2:2017, 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
25、 he received granular material derived from End-of-Life Tyres (ELTs) or from products mainly based on EPDM polymers. True density is different between these two products and could be reliable element to discriminate. Typical values are: ELT granulates: 1.16 - 1.22; EPDM granulates: 1.4 - 1.6. PD CEN
26、/TS 17189:2018CEN/TS 17189:2018 (E) 5 1 Scope This document sets out methods and test protocols used to determine the true density of granulates 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
27、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. prEN 14243-1:2017, Materials obtained from end of life tyres Part 1: General defini
28、tions related to the methods for determining their dimension(s) and impurities prEN 14243-2:2017, Materials obtained from end of life tyres Part 2: Granulates and powders Methods for determining their dimension(s) and impurities, including free steel and free textile content CEN/TS 17188:2018, Mater
29、ials 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 prEN 14243-1:2017 and the following apply. ISO and IEC maintain terminological databases for use in s
30、tandardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp 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 volume of
31、water at the same temperature Note 1 to entry: The true density is the relationship between the mass and the actually occupied volume. Note 2 to entry: It is a dimensionless quantity characteristic of the material being measured. 3.2 pycnometer (density bottle) flask (of known volume) for determinin
32、g the density of liquids or solids and the water content of aggregates 4 Principle This method should be used to characterize granulates coming from ELTs. The principle of this measurement is to use a glass container of known volume and to weigh the volume of water displaced by the sample to be meas
33、ured. PD CEN/TS 17189:2018CEN/TS 17189:2018 (E) 6 The cap of the pycnometer ends with a very thin capillary tube. The cap is adjusted on the bottle, so the overflow of liquid escapes through the upper end of the tube. This allows a highly accurate determination of the displaced volume of liquid. Sim
34、ply weigh using a precision scale the pycnometer before and after filling it to determine by calculation the true density. 5 Apparatus The measurements shall be conducted in a laboratory at a controlled temperature of 22 C. 5.1 Scales The scales shall be accurate to 1 mg. 5.2 Pycnometer Minimum 250
35、cm3capacity. 5.3 Vacuum chamber The vacuum chamber shall have a sufficient volume to place the pycnometer and shall be able to reach and maintain a pressure of 40 mbar. 6 Procedure 6.1 Sampling A laboratory sample is obtained in accordance with prEN 14243-2:2017, 5.2, or following a method to collec
36、t samples in big-bag as mentioned in CEN/TS 17188. The sampling procedure shall be known and documented. Using a sampler divider, the laboratory sample shall be reduced to test samples ranging from 3 g to 4 g. Before calculating the density, all granulates containing fibres shall be removed. 6.2 Met
37、hod Before the analysis, dry the pycnometer in the oven and allow it to cool down to room temperature inside a desiccator. Weigh a clean and dry pycnometer before and after the insertion of granulates. The difference is the mass of the sample M. Before weighing the pycnometer with sample, clean the
38、outer walls of the pycnometer in order to avoid errors in the sample mass. Partially fill the pycnometer containing granulates with deionized water. To reduce the adhesion of air bubbles to the crumb particles and granulates, add a small amount of surfactant. Homogenize and then completely fill the
39、pycnometer with water. Place the pycnometer in a vacuum chamber for degassing and apply vacuum pumping at P = 40 mbar during 40 min to remove the entrapped air. Weigh the pycnometer and contents (M3). Empty the pycnometer completely, clean it and refill it with water. After removing air bubbles, wei
40、gh the water filled pycnometer (M1). PD CEN/TS 17189:2018CEN/TS 17189:2018 (E) 7 7 Expression of results The calculation is as follows: True density dsof the sample: =sM dV * swd(1) where Vsis the volume of the sample; dwis the density of water (= 1 g/cm3at 22 C). which can be simplified as: ( )=12M
41、dVVs(2) where V1is the volume of water without the sample; V2is the volume of water in the pycnometer with the sample. In terms of mass: ( )=12MdMMs(3) where M is the mass of the sample; M1is the mass of pycnometer filled with water; M2is the mass of water in the pycnometer when the sample is presen
42、t. Given that = 23M MM: ( )=+s13MdM MM(4) where M3is the mass of pycnometer filled with the sample and water. PD CEN/TS 17189:2018CEN/TS 17189:2018 (E) 8 8 Test report The sampling scheme shall contain the following information: a) the name of the sampler, the place where the sample was taken and th
43、e date when it was taken; b) a full identification of the laboratory sample (reference); c) the mass of the laboratory sample (g); d) the type of ELTs specified in the test program; e) the reference to this Technical Specification; f) the report on all the operating conditions not specified in this
44、Technical Specification, or any optional operations; g) the report on any possible incidents that might have affected the representative nature of the sample. PD CEN/TS 17189:2018CEN/TS 17189:2018 (E) 9 Bibliography 1 ISO 2781:2008/Amd1:2010, Rubber, vulcanized or thermoplastic Determination of dens
45、ity 2 Compendium of Chemical Terminology, IUPAC (International Union of Pure and Applied Chemistry) Second edition (1997-1999). PD CEN/TS 17189:2018This page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, informat
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