EN ISO 8985:2022
(Main)Plastics - Ethylene/vinyl acetate copolymer (EVAC) thermoplastics - Determination of vinyl acetate content (ISO 8985:2022, Corrected version 2022-08)
Plastics - Ethylene/vinyl acetate copolymer (EVAC) thermoplastics - Determination of vinyl acetate content (ISO 8985:2022, Corrected version 2022-08)
This document specifies two categories of method for the determination of the vinyl acetate (VAC) content of ethylene/vinyl acetate (EVAC) copolymer, for use in the designation of such copolymers according to ISO 21301-1. One category is referred to as “reference methods”, the other as “test methods”.
The “reference methods” are used to calibrate the method used for the determination of the vinyl acetate content of ethylene/vinyl acetate copolymers.
The “test methods” are other methods which can be used for the determination if they are calibrated using one of the reference methods described in Clause 4, provided they show a certain permissible repeatability.
Kunststoffe - Ethylen-Vinylacetat-Copolymer (EVAC)-Thermoplasten - Bestimmung des Vinylacetatgehalts (ISO 8985:2022, korrigierte Fassung 2022-08)
Dieses Dokument legt zwei Kategorien von Verfahren zur Bestimmung des Vinylacetat(VAC, en: vinyl acetate)-Gehalts von Ethylen-Vinylacetat-Copolymeren (EVAC) zur Verwendung in der Bezeichnung derartiger Copolymere nach ISO 21301 1 fest. Dabei bezeichnet eine Kategorie die „Referenzverfahren“ und die andere die „Prüfverfahren“.
Die „Referenzverfahren“ werden angewendet, um das zur Bestimmung des Vinylacetatgehalts von Ethylen-Vinylacetat-Copolymeren angewendete Verfahren zu kalibrieren.
Die „Prüfverfahren“ stellen weitere Verfahren dar, die für die Bestimmung angewendet werden können, wenn sie unter Anwendung eines der in Abschnitt 4 beschriebenen Referenzverfahren kalibriert wurden und wenn sie eine bestimmte zulässige Wiederholpräzision aufweisen.
SICHERHEITSVORKEHRUNGEN — Anwender dieses Dokuments sollten, falls zutreffend, mit der üblichen Laborpraxis vertraut sein. Dieses Dokument gibt nicht vor, alle im Zusammenhang mit seiner Anwendung gegebenenfalls vorhandenen Sicherheitsrisiken zu berücksichtigen. Es liegt in der Verantwortung des Anwenders, angemessene Maßnahmen in Bezug auf den Gesundheits- und Arbeitsschutz einzuleiten.
Plastiques - Copolymères éthylène/acétate de vinyle (EVAC) thermoplastiques - Dosage de l'acétate de vinyle (ISO 8985:2022, Version corrigée 2022-08)
Le présent document spécifie deux catégories de méthodes pour le dosage de l’acétate de vinyle (VAC) dans les copolymères éthylène/acétate de vinyle (EVAC) en vue de leur désignation conformément à l’ISO 21301-1. Une catégorie est dite «méthodes de référence», l’autre «méthode d’essai».
Les «méthodes de référence» sont utilisées pour l’étalonnage de la méthode utilisée pour le dosage de l’acétate de vinyle dans les copolymères éthylène/acétate de vinyle.
Les «méthodes d’essai» sont d’autres méthodes qui peuvent être utilisées pour la détermination si elles sont étalonnées à l’aide de l’une des méthodes de référence décrites à l’Article 4 et si elles montrent une certaine répétabilité admissible.
Polimerni materiali - Termoplastični kopolimer etilena in vinil acetata (EVAC-kopolimer) - Ugotavljanje deleža vinil acetata (ISO 8985:2022, popravljena različica 2022-08)
Ta dokument določa dve kategoriji metod za ugotavljanje deleža vinil acetata (VAC) v termoplastičnem kopolimeru etilena in vinil acetata (EVAC-kopolimer) za uporabo pri označevanju takih kopolimerov v skladu s standardom ISO 21301-1. Ena kategorija se imenuje »referenčne metode«, druga pa »preskusne metode«. »Referenčne metode« se uporabljajo za umerjanje metode za ugotavljanje deleža vinil acetata v termoplastičnih kopolimerih etilena in vinil acetata. »Preskusne metode« so druge metode, ki jih je mogoče uporabiti za določevanje, če so umerjene z uporabo ene od referenčnih metod, opisanih v točki 4, ter pod pogojem, da omogočajo določeno dovoljeno ponovljivost.
General Information
Relations
Overview
EN ISO 8985:2022 (ISO 8985:2022, corrected version 2022-08) defines standardized methods for the determination of vinyl acetate (VAC) content in ethylene/vinyl acetate (EVAC) thermoplastics. Published by CEN/ISO, this standard divides analytical approaches into reference methods and test methods. Reference methods are used to calibrate other (test) methods; calibrated test methods may be used for routine analysis provided they meet specified repeatability criteria. The standard supports material designation per ISO 21301-1 and supersedes earlier editions.
Key Topics
- Scope and purpose: Procedures to quantify vinyl acetate content (VAC) in EVAC copolymers for classification and quality control.
- Two method categories:
- Reference methods (Clause 4): used to produce calibration data. Examples listed include:
- Hydrolysis and back titration
- Saponification and potentiometric titration
- Measurement of oxygen (method for oxygen-related determination)
- Test methods (Clause 5 and examples): alternative analytical techniques that must be calibrated against a reference method and demonstrate permissible repeatability. Examples include:
- Infrared (IR) spectrometry
- Acidimetric and iodometric titration methods
- Thermogravimetric analysis (TGA)
- Reference methods (Clause 4): used to produce calibration data. Examples listed include:
- Calibration and repeatability: Test methods require calibration with a reference method (see Clause 4) and validation against repeatability limits before use for official designation or QC.
- Reporting requirements: The standard specifies how results and method details should be reported (test report content).
Applications
- Quality control in EVAC production: monitor VAC content for consistency in polymer properties (flexibility, adhesion, thermal behavior).
- Incoming material inspection: verify supplier specifications of vinyl acetate content for raw EVAC resins and compounds.
- Product certification and material designation: determine VAC for classification according to ISO 21301-1 and for regulatory or customer specifications.
- R&D and formulation: support formulation development, property tuning and troubleshooting where VAC content affects performance.
- Third‑party testing laboratories: implement standardized procedures for traceable VAC quantification in laboratory test reports.
Who should use this standard
- Polymer manufacturers and compounders working with EVAC
- QC chemists and analytical laboratories
- Materials engineers and product designers requiring composition data
- Certification bodies and standards committees
Related standards
- ISO 21301-1 - Material designation and classification of EVAC copolymers (referenced for designation based on VAC content).
Keywords: EN ISO 8985, ISO 8985:2022, EVAC, ethylene vinyl acetate, vinyl acetate content, vinyl acetate (VAC) determination, reference methods, test methods, IR spectrometry, thermogravimetry.
Frequently Asked Questions
EN ISO 8985:2022 is a standard published by the European Committee for Standardization (CEN). Its full title is "Plastics - Ethylene/vinyl acetate copolymer (EVAC) thermoplastics - Determination of vinyl acetate content (ISO 8985:2022, Corrected version 2022-08)". This standard covers: This document specifies two categories of method for the determination of the vinyl acetate (VAC) content of ethylene/vinyl acetate (EVAC) copolymer, for use in the designation of such copolymers according to ISO 21301-1. One category is referred to as “reference methods”, the other as “test methods”. The “reference methods” are used to calibrate the method used for the determination of the vinyl acetate content of ethylene/vinyl acetate copolymers. The “test methods” are other methods which can be used for the determination if they are calibrated using one of the reference methods described in Clause 4, provided they show a certain permissible repeatability.
This document specifies two categories of method for the determination of the vinyl acetate (VAC) content of ethylene/vinyl acetate (EVAC) copolymer, for use in the designation of such copolymers according to ISO 21301-1. One category is referred to as “reference methods”, the other as “test methods”. The “reference methods” are used to calibrate the method used for the determination of the vinyl acetate content of ethylene/vinyl acetate copolymers. The “test methods” are other methods which can be used for the determination if they are calibrated using one of the reference methods described in Clause 4, provided they show a certain permissible repeatability.
EN ISO 8985:2022 is classified under the following ICS (International Classification for Standards) categories: 83.080.20 - Thermoplastic materials. The ICS classification helps identify the subject area and facilitates finding related standards.
EN ISO 8985:2022 has the following relationships with other standards: It is inter standard links to EN ISO 8985:1998. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase EN ISO 8985:2022 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2022
Nadomešča:
SIST EN ISO 8985:1999
Polimerni materiali - Termoplastični kopolimer etilena in vinil acetata (EVAC-
kopolimer) - Ugotavljanje deleža vinil acetata (ISO 8985:2022)
Plastics - Ethylene/vinyl acetate copolymer (EVAC) thermoplastics - Determination of
vinyl acetate content (ISO 8985:2022)
Kunststoffe - Ethylen-Vinylacetat-Copolymer (EVAC)-Thermoplasten - Bestimmung des
Vinylacetatgehalts (ISO 8985:2022)
Plastiques - Copolymères éthylène/acétate de vinyle (EVAC) thermoplastiques - Dosage
de l'acétate de vinyle (ISO 8985:2022)
Ta slovenski standard je istoveten z: EN ISO 8985:2022
ICS:
83.080.20 Plastomeri Thermoplastic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 8985
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2022
EUROPÄISCHE NORM
ICS 83.080.20 Supersedes EN ISO 8985:1998
English Version
Plastics - Ethylene/vinyl acetate copolymer (EVAC)
thermoplastics - Determination of vinyl acetate content
(ISO 8985:2022)
Plastiques - Copolymères éthylène/acétate de vinyle Kunststoffe - Ethylen-Vinylacetat-Copolymer (EVAC)-
(EVAC) thermoplastiques - Dosage de l'acétate de Thermoplasten - Bestimmung des Vinylacetatgehalts
vinyle (ISO 8985:2022) (ISO 8985:2022)
This European Standard was approved by CEN on 25 December 2021.
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, Turkey 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8985:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 8985:2022) has been prepared by Technical Committee ISO/TC 61 "Plastics" in
collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN.
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 August 2022, and conflicting national standards shall
be withdrawn at the latest by August 2022.
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 EN ISO 8985:1998.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. 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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 8985:2022 has been approved by CEN as EN ISO 8985:2022 without any modification.
INTERNATIONAL ISO
STANDARD 8985
Third edition
2022-01
Plastics — Ethylene/vinyl acetate
copolymer (EVAC) thermoplastics —
Determination of vinyl acetate content
Plastiques — Copolymères éthylène/acétate de vinyle (EVAC)
thermoplastiques — Dosage de l'acétate de vinyle
Reference number
ISO 8985:2022(E)
ISO 8985:2022(E)
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 8985:2022(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Reference methods .1
4.1 Reference method 1: Hydrolysis and back titration . 1
4.1.1 Principle . 1
4.1.2 Reagents . 2
4.1.3 Apparatus . 2
4.1.4 Procedure . 3
4.1.5 Expression of results . 3
4.1.6 Test report . 4
4.2 Reference method 2: Saponification and potentiometric titration. 4
4.2.1 Principle . 4
4.2.2 Reagents . 4
4.2.3 Apparatus . 4
4.2.4 Procedure . 5
4.2.5 Expression of results . 6
4.2.6 Test report . 6
4.3 Reference method 3: Measurement of oxygen . 6
4.3.1 Principle . 6
4.3.2 Apparatus . 6
4.3.3 procedure . . . 7
4.3.4 Sampling . 11
4.3.5 Calibration . . . 11
4.3.6 Calculation of vinyl acetate content .12
4.3.7 Test report .12
5 Examples of test methods .12
5.1 Method using infrared spectrometry .12
5.1.1 Principle . 12
5.1.2 Apparatus and materials .12
5.1.3 Procedure .13
5.1.4 Expression of results .15
5.1.5 Test report . 16
5.2 Acidimetric method . 16
5.2.1 Principle . 16
5.2.2 Reagents and materials . 16
5.2.3 Apparatus . 17
5.2.4 Procedure . 17
5.2.5 Expression of results . 18
5.2.6 Test report . 18
5.3 Iodometric method . 19
5.3.1 Principle . 19
5.3.2 Reagents . 19
5.3.3 Apparatus . 19
5.3.4 Procedure . 19
5.3.5 Expression of results . 20
5.3.6 Test report .20
5.4 Thermogravimetry method .20
5.4.1 Principle . 20
5.4.2 Apparatus . 21
5.4.3 Test specimens . 21
5.4.4 Calibration . . . 21
iii
ISO 8985:2022(E)
5.4.5 Procedure . 21
5.4.6 Test report .22
Bibliography .23
iv
ISO 8985:2022(E)
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
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 9,
Thermoplastic materials, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 249, Plastics, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 8985:1998), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— the normative references have been updated to the latest version;
— the mandatory terms and definitions clause has been added (see Clause 3);
— a “thermogravimetry test method” has been added;
— infrared spectrometer has been modified to be Fourier infrared spectrometer;
— the example of infrared spectrum has been modified from transmission to absorbance;
— the example of calibration curve has been modified.
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.
v
INTERNATIONAL STANDARD ISO 8985:2022(E)
Plastics — Ethylene/vinyl acetate copolymer (EVAC)
thermoplastics — Determination of vinyl acetate content
SAFETY PRECAUTIONS — Persons using this document should be familiar with normal laboratory
practice, if applicable. This document does not purport to address all of the safety concerns, if
any, associated with its use. It is the responsibility of the user to establish appropriate safety
and health practices.
1 Scope
This document specifies two categories of method for the determination of the vinyl acetate (VAC)
content of ethylene/vinyl acetate (EVAC) copolymer, for use in the designation of such copolymers
according to ISO 21301-1. One category is referred to as “reference methods”, the other as “test
methods”.
The “reference methods” are used to calibrate the method used for the determination of the vinyl
acetate content of ethylene/vinyl acetate copolymers.
The “test methods” are other methods which can be used for the determination if they are calibrated
using one of the reference methods described in Clause 4, provided they show a certain permissible
repeatability.
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.
ISO 472, Plastics — Vocabulary
ISO 4799, Laboratory glassware — Condensers
ISO 11358-1:2014, Plastics — Thermogravimetry (TG) of polymers — Part 1: General principles
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472 apply.
ISO and IEC maintain terminological 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 Reference methods
4.1 Reference method 1: Hydrolysis and back titration
4.1.1 Principle
A test portion is dissolved in xylene and the acetate groups are hydrolysed with alcoholic potassium
hydroxide solution. An excess of sulfuric or hydrochloric acid is added. The acid is back titrated with a
standard sodium hydroxide solution in the presence of phenolphthalein as indicator.
ISO 8985:2022(E)
4.1.2 Reagents
During the analysis, use only reagents of recognized analytical quality and distilled water or water of
equivalent purity.
4.1.2.1 Xylene.
4.1.2.2 Sulfuric acid, approximately 5 g/l solution, or hydrochloric acid, approximately 3,7 g/l
solution.
4.1.2.3 Potassium hydroxide, approximately 5,6 g/l ethanol solution.
Dissolve 5,6 g of solid potassium hydroxide (KOH) in 500 ml of ethanol, make up to 1 000 ml, leave to
settle until the next day and decant the clear part of the solution.
4.1.2.4 Sodium hydroxide, standard solution, c(NaOH) = 0,1 mol/l.
4.1.2.5 Phenolphthalein, indicator solution.
Dissolve 0,7 g of phenolphthalein in 100 ml of ethanol.
4.1.3 Apparatus
Standard laboratory apparatus, plus the following:
4.1.3.1 Burette, 50 ml capacity, for the sodium hydroxide solution (4.1.2.4).
4.1.3.2 Pipette, 30 ml capacity, for the acid solution (4.1.2.2).
4.1.3.3 Pipette, 25 ml capacity, for the potassium hydroxide solution (4.1.2.3).
4.1.3.4 Test tube, 50 ml capacity, for the xylene (4.1.2.1).
4.1.3.5 Flask, up to 300 ml capacity, with stopper.
4.1.3.6 Dropping bottle, for the phenolphthalein indicator solution (4.1.2.5).
4.1.3.7 Reflux condenser, at least 500 mm long, in accordance with ISO 4799.
4.1.3.8 Heating equipment, sand bath, oil bath or heating jacket, adjustable to 200 °C.
4.1.3.9 Analytical balance, with an accuracy of 0,1 mg.
ISO 8985:2022(E)
4.1.4 Procedure
4.1.4.1 Determination
4.1.4.1.1 Weigh a quantity of dry polymer as shown in Table 1 into the flask (4.1.3.5) to the nearest
0,1 mg. The mass of each sample particle shall be less than approximately 0,05 g.
Table 1 — Guide to the mass of the sample to be used
Assumed vinyl acetate content
Approximate mass of test portion
w(VAC)
g
%
w(VAC) ≤ 10 1
10 < w(VAC) ≤ 20 0,5
20 < w(VAC) ≤ 40 0,3
40 < w(VAC) 0,2
When analysing an unknown sample, first carry out a preliminary test under conditions which are valid
for a copolymer containing 20 % to 40 % VAC.
4.1.4.1.2 Add 50 ml of xylene (4.1.2.1) to the contents of the flask and 25 ml of potassium hydroxide
(4.1.2.3), using the pipette (4.1.3.3). Heat the flask, topped with the reflux condenser (4.1.3.7), for 2 h
using the heating apparatus. After hydrolysis, remove the flask from the heating apparatus and allow
to cool to ambient temperature. Add 30 ml of sulfuric or hydrochloric acid (4.1.2.2), using the pipette
(4.1.3.2), stopper the flask and shake vigorously. Add several drops of phenolphthalein solution (4.1.2.5)
and titrate the excess acid with standard sodium hydroxide solution (4.1.2.4), shaking the flask during
the titration.
4.1.4.2 Blank test
Carry out a blank test in parallel with the determination, following the same procedure and using the
same reagents but omitting the test portion.
4.1.5 Expression of results
4.1.5.1 The vinyl acetate content w(VAC), expressed as a percentage by mass, is given by the
Formula (1):
00, 8 609×−()VV ×c
12 1
w()VAC = ×100 (1)
m
where
V is the volume, in ml, of sodium hydroxide solution used for the determination;
V is the volume, in ml, of sodium hydroxide solution used for the blank test;
c is the actual concentration, expressed in mol/l, of the sodium hydroxide solution used for
the titration;
m is the mass, in g, of the test portion (see 4.1.4.1.1);
0,08 609 is the molar mass of vinyl acetate, in kg/mol.
ISO 8985:2022(E)
4.1.5.2 Carry out two determinations. If the results differ by more than 1 %, discard them and run
the determinations again. Report the arithmetic mean of the two determinations.
4.1.6 Test report
The test report shall contain the following information:
a) a reference to this document (i.e. ISO 8985:2022) and the method used;
b) all details necessary for the complete identification of the sample;
c) the result, expressed in accordance with 4.1.5.2.
4.2 Reference method 2: Saponification and potentiometric titration
4.2.1 Principle
A test portion is dissolved in a mixture of xylene and hexan-1-ol and the acetate groups are hydrolysed
with alcoholic potassium hydroxide solution. Acetone is added to prevent copolymer precipitation. The
excess alkali is titrated with standard hydrochloric acid using a potentiometric titrimeter.
4.2.2 Reagents
During analysis use only reagents of recognized analytical quality and distilled water or water of
equivalent purity.
4.2.2.1 Xylene.
4.2.2.2 Hexan-1-ol.
4.2.2.3 Potassium hydroxide, approximately 28 g/l ethanolic solution.
4.2.2.4 Acetone.
4.2.2.5 Hydrochloric acid, standard solution, c(HCl) = 0,3 mol/l.
4.2.2.6 Lithium chloride, 40 g/l ethanolic solution.
4.2.3 Apparatus
Standard laboratory equipment, plus the following:
4.2.3.1 Potentiometric titrator, with a 10 ml capacity burette graduated every 0,02 ml, a
millivoltmeter or other suitable type of voltmeter, a glass measurement electrode, a silver/silver
chloride reference electrode and a connecting bridge and beaker filled with an ethanolic solution of
lithium chloride (4.2.2.6). Other types of potentiometric titrator may be used.
4.2.3.2 Test tube, capacity 50 ml, for the xylene (4.2.2.1) and the acetone (4.2.2.4).
4.2.3.3 Burette, capacity 5 ml, for the potassium hydroxide solution (4.2.2.3).
4.2.3.4 Pipette, capacity 10 ml, for the hexan-1-ol (4.2.2.2).
4.2.3.5 Flask, capacity 100 ml.
ISO 8985:2022(E)
4.2.3.6 Reflux condenser, at least 300 mm long, in accordance with ISO 4799.
4.2.3.7 Heating apparatus, sand bath, oil bath or heating jacket, adjustable to approximately 200 °C.
4.2.3.8 Analytical balance, with an accuracy of 0,1 mg.
4.2.3.9 Magnetic stirrer.
4.2.4 Procedure
4.2.4.1 Determination
4.2.4.1.1 Weigh a quantity of dry polymer as shown in Table 2 into the flask to the nearest 0,1 mg. The
mass of each sample particle shall be less than approximately 0,05 g.
Table 2 — Guide to the mass of the sample to be used
Assumed vinyl acetate content
Approximate mass of test portion
w(VAC)
g
%
w(VAC) ≤ 2 1
2 < w(VAC) ≤ 5 0,5
5 < w(VAC) ≤ 30 0,2
30 < w(VAC) 0,1
When analysing an unknown sample, first carry out a preliminary test under conditions which are valid
for a copolymer containing 5 % to 30 % vinyl acetate.
4.2.4.1.2 Add 25 ml of xylene (4.2.2.1) to the contents of the flask and 10ml of hexan-1-ol (4.2.2.2)
and 5ml of potassium hydroxide solution (4.2.2.3). Heat the flask, topped with the reflux condenser
(4.2.3.6), for 30 min, using the heating apparatus (4.2.3.7) set at boiling temperature.
4.2.4.1.3 After 30 min, remove the flask from the heating apparatus and allow to cool for 5 min to
6 min., then introduce 35 ml of acetone (4.2.2.4) through the top of the condenser. Remove the condenser
and place the flask (if conical) on the magnetic stirrer (4.2.3.9), otherwise transfer the solution to a
beaker first.
4.2.4.1.4 Immerse the glass electrode (see 4.2.3.1) and one of the ends of the connecting bridge
into the flask or beaker. Immerse the other end of the connecting bridge and the silver/silver chloride
reference electrode (see 4.2.3.1) in the beaker filled with the ethanolic solution of lithium chloride
(4.2.2.6).
4.2.4.1.5 Carry out the potentiometric titration immediately, adding standard hydrochloric acid
(4.2.2.5) until the first drop in potential and stirring all the time. When close to the end point, add acid
in 0,04 ml to 0,06 ml increments.
4.2.4.1.6 When the end point is reached, read off the voltage, in millivolts, on the titrator as well a
...
SLOVENSKI STANDARD
01-april-2022
Nadomešča:
SIST EN ISO 8985:1999
Polimerni materiali - Termoplastični kopolimer etilena in vinil acetata (EVAC-
kopolimer) - Ugotavljanje deleža vinil acetata (ISO 8985:2022, popravljena različica
2022-08)
Plastics - Ethylene/vinyl acetate copolymer (EVAC) thermoplastics - Determination of
vinyl acetate content (ISO 8985:2022, Corrected version 2022-08)
Kunststoffe - Ethylen-Vinylacetat-Copolymer (EVAC)-Thermoplasten - Bestimmung des
Vinylacetatgehalts (ISO 8985:2022, korrigierte Fassung 2022-08)
Plastiques - Copolymères éthylène/acétate de vinyle (EVAC) thermoplastiques - Dosage
de l'acétate de vinyle (ISO 8985:2022, Version corrigée 2022-08)
Ta slovenski standard je istoveten z: EN ISO 8985:2022
ICS:
83.080.20 Plastomeri Thermoplastic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 8985
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2022
EUROPÄISCHE NORM
ICS 83.080.20 Supersedes EN ISO 8985:1998
English Version
Plastics - Ethylene/vinyl acetate copolymer (EVAC)
thermoplastics - Determination of vinyl acetate content
(ISO 8985:2022, Corrected version 2022-08)
Plastiques - Copolymères éthylène/acétate de vinyle Kunststoffe - Ethylen-Vinylacetat-Copolymer (EVAC)-
(EVAC) thermoplastiques - Dosage de l'acétate de Thermoplasten - Bestimmung des Vinylacetatgehalts
vinyle (ISO 8985:2022, Version corrigée 2022-08) (ISO 8985:2022, korrigierte Fassung 2022-08)
This European Standard was approved by CEN on 25 December 2021.
This European Standard was corrected and reissued by the CEN-CENELEC Management Centre on 14 September 2022.
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 NORMALISATIO N
EUROPÄISCHES KOMITEE FÜR NORMUN G
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8985:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 8985:2022) has been prepared by Technical Committee ISO/TC 61 "Plastics" in
collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN.
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 August 2022, and conflicting national standards shall
be withdrawn at the latest by August 2022.
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 EN ISO 8985:1998.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. 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.
Endorsement notice
The text of ISO 8985:2022, Corrected version 2022-08 has been approved by CEN as EN ISO 8985:2022
without any modification.
INTERNATIONAL ISO
STANDARD 8985
Third edition
2022-01
Corrected version
2022-08
Plastics — Ethylene/vinyl acetate
copolymer (EVAC) thermoplastics —
Determination of vinyl acetate content
Plastiques — Copolymères éthylène/acétate de vinyle (EVAC)
thermoplastiques — Dosage de l'acétate de vinyle
Reference number
ISO 8985:2022(E)
ISO 8985:2022(E)
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 8985:2022(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Reference methods .1
4.1 Reference method 1: Hydrolysis and back titration . 1
4.1.1 Principle . 1
4.1.2 Reagents . 2
4.1.3 Apparatus . 2
4.1.4 Procedure . 3
4.1.5 Expression of results . 3
4.1.6 Test report . 4
4.2 Reference method 2: Saponification and potentiometric titration. 4
4.2.1 Principle . 4
4.2.2 Reagents . 4
4.2.3 Apparatus . 4
4.2.4 Procedure . 5
4.2.5 Expression of results . 6
4.2.6 Test report . 6
4.3 Reference method 3: Measurement of oxygen . 6
4.3.1 Principle . 6
4.3.2 Apparatus . 6
4.3.3 procedure . . 7
4.3.4 Sampling . 11
4.3.5 Calibration . . . 11
4.3.6 Calculation of vinyl acetate content .12
4.3.7 Test report .12
5 Examples of test methods .12
5.1 Method using infrared spectrometry .12
5.1.1 Principle . 12
5.1.2 Apparatus and materials .12
5.1.3 Procedure .13
5.1.4 Expression of results . 16
5.1.5 Test report . 16
5.2 Acidimetric method . 16
5.2.1 Principle . 16
5.2.2 Reagents and materials . 16
5.2.3 Apparatus . 17
5.2.4 Procedure . 17
5.2.5 Expression of results . 18
5.2.6 Test report . 19
5.3 Iodometric method . 19
5.3.1 Principle . 19
5.3.2 Reagents . 19
5.3.3 Apparatus . 19
5.3.4 Procedure . 19
5.3.5 Expression of results . 20
5.3.6 Test report .20
5.4 Thermogravimetry method . 21
5.4.1 Principle . 21
5.4.2 Apparatus . 21
5.4.3 Test specimens . 21
5.4.4 Calibration . . . 21
iii
ISO 8985:2022(E)
5.4.5 Procedure . 21
5.4.6 Test report .23
Bibliography .24
iv
ISO 8985:2022(E)
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
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 9,
Thermoplastic materials, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 249, Plastics, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 8985:1998), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— the normative references have been updated to the latest version;
— the mandatory terms and definitions clause has been added (see Clause 3);
— a “thermogravimetry test method” has been added;
— infrared spectrometer has been modified to be Fourier infrared spectrometer;
— the example of infrared spectrum has been modified from transmission to absorbance;
— the example of calibration curve has been modified.
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.
This corrected version of ISO 8985:2022 incorporates the following corrections:
— the missing content has been reinstated in subclauses 4.3.3.2.5, 4.3.5, 5.2.5.2 and 5.4.5.3;
— the values of Formula (6) has been corrected;
— the subtitles of Figure 2 have been corrected;
— the unit in Figure 5 has been corrected;
v
ISO 8985:2022(E)
— the legend for Formula (11) has been corrected.
vi
INTERNATIONAL STANDARD ISO 8985:2022(E)
Plastics — Ethylene/vinyl acetate copolymer (EVAC)
thermoplastics — Determination of vinyl acetate content
SAFETY PRECAUTIONS — Persons using this document should be familiar with normal laboratory
practice, if applicable. This document does not purport to address all of the safety concerns, if
any, associated with its use. It is the responsibility of the user to establish appropriate safety
and health practices.
1 Scope
This document specifies two categories of method for the determination of the vinyl acetate (VAC)
content of ethylene/vinyl acetate (EVAC) copolymer, for use in the designation of such copolymers
according to ISO 21301-1. One category is referred to as “reference methods”, the other as “test
methods”.
The “reference methods” are used to calibrate the method used for the determination of the vinyl
acetate content of ethylene/vinyl acetate copolymers.
The “test methods” are other methods which can be used for the determination if they are calibrated
using one of the reference methods described in Clause 4, provided they show a certain permissible
repeatability.
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.
ISO 472, Plastics — Vocabulary
ISO 4799, Laboratory glassware — Condensers
ISO 11358-1:2014, Plastics — Thermogravimetry (TG) of polymers — Part 1: General principles
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472 apply.
ISO and IEC maintain terminological 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 Reference methods
4.1 Reference method 1: Hydrolysis and back titration
4.1.1 Principle
A test portion is dissolved in xylene and the acetate groups are hydrolysed with alcoholic potassium
hydroxide solution. An excess of sulfuric or hydrochloric acid is added. The acid is back titrated with a
standard sodium hydroxide solution in the presence of phenolphthalein as indicator.
ISO 8985:2022(E)
4.1.2 Reagents
During the analysis, use only reagents of recognized analytical quality and distilled water or water of
equivalent purity.
4.1.2.1 Xylene.
4.1.2.2 Sulfuric acid, approximately 5 g/l solution, or hydrochloric acid, approximately 3,7 g/l
solution.
4.1.2.3 Potassium hydroxide, approximately 5,6 g/l ethanol solution.
Dissolve 5,6 g of solid potassium hydroxide (KOH) in 500 ml of ethanol, make up to 1 000 ml, leave to
settle until the next day and decant the clear part of the solution.
4.1.2.4 Sodium hydroxide, standard solution, c(NaOH) = 0,1 mol/l.
4.1.2.5 Phenolphthalein, indicator solution.
Dissolve 0,7 g of phenolphthalein in 100 ml of ethanol.
4.1.3 Apparatus
Standard laboratory apparatus, plus the following:
4.1.3.1 Burette, 50 ml capacity, for the sodium hydroxide solution (4.1.2.4).
4.1.3.2 Pipette, 30 ml capacity, for the acid solution (4.1.2.2).
4.1.3.3 Pipette, 25 ml capacity, for the potassium hydroxide solution (4.1.2.3).
4.1.3.4 Test tube, 50 ml capacity, for the xylene (4.1.2.1).
4.1.3.5 Flask, up to 300 ml capacity, with stopper.
4.1.3.6 Dropping bottle, for the phenolphthalein indicator solution (4.1.2.5).
4.1.3.7 Reflux condenser, at least 500 mm long, in accordance with ISO 4799.
4.1.3.8 Heating equipment, sand bath, oil bath or heating jacket, adjustable to 200 °C.
4.1.3.9 Analytical balance, with an accuracy of 0,1 mg.
ISO 8985:2022(E)
4.1.4 Procedure
4.1.4.1 Determination
4.1.4.1.1 Weigh a quantity of dry polymer as shown in Table 1 into the flask (4.1.3.5) to the nearest
0,1 mg. The mass of each sample particle shall be less than approximately 0,05 g.
Table 1 — Guide to the mass of the sample to be used
Assumed vinyl acetate content
Approximate mass of test portion
w(VAC)
g
%
w(VAC) ≤ 10 1
10 < w(VAC) ≤ 20 0,5
20 < w(VAC) ≤ 40 0,3
40 < w(VAC) 0,2
When analysing an unknown sample, first carry out a preliminary test under conditions which are valid
for a copolymer containing 20 % to 40 % VAC.
4.1.4.1.2 Add 50 ml of xylene (4.1.2.1) to the contents of the flask and 25 ml of potassium hydroxide
(4.1.2.3), using the pipette (4.1.3.3). Heat the flask, topped with the reflux condenser (4.1.3.7), for 2 h
using the heating apparatus. After hydrolysis, remove the flask from the heating apparatus and allow
to cool to ambient temperature. Add 30 ml of sulfuric or hydrochloric acid (4.1.2.2), using the pipette
(4.1.3.2), stopper the flask and shake vigorously. Add several drops of phenolphthalein solution (4.1.2.5)
and titrate the excess acid with standard sodium hydroxide solution (4.1.2.4), shaking the flask during
the titration.
4.1.4.2 Blank test
Carry out a blank test in parallel with the determination, following the same procedure and using the
same reagents but omitting the test portion.
4.1.5 Expression of results
4.1.5.1 The vinyl acetate content w(VAC), expressed as a percentage by mass, is given by the
Formula (1):
0,08609×−()VV ×c
12 1
w()VAC = ×100 (1)
m
where
V is the volume, in ml, of sodium hydroxide solution used for the determination;
V is the volume, in ml, of sodium hydroxide solution used for the blank test;
c is the actual concentration, expressed in mol/l, of the sodium hydroxide solution used for
the titration;
m is the mass, in g, of the test portion (see 4.1.4.1.1);
0,08609 is the molar mass of vinyl acetate, in kg/mol.
ISO 8985:2022(E)
4.1.5.2 Carry out two determinations. If the results differ by more than 1 %, discard them and run
the determinations again. Report the arithmetic mean of the two determinations.
4.1.6 Test report
The test report shall contain the following information:
a) a reference to this document (i.e. ISO 8985:2022) and the method used;
b) all details necessary for the complete identification of the sample;
c) the result, expressed in accordance with 4.1.5.2.
4.2 Reference method 2: Saponification and potentiometric titration
4.2.1 Principle
A test portion is dissolved in a mixture of xylene and hexan-1-ol and the acetate groups are hydrolysed
with alcoholic potassium hydroxide solution. Acetone is added to prevent copolymer precipitation. The
excess alkali is titrated with standard hydrochloric acid using a potentiometric titrimeter.
4.2.2 Reagents
During analysis use only reagents of recognized analytical quality and distilled water or water of
equivalent purity.
4.2.2.1 Xylene.
4.2.2.2 Hexan-1-ol.
4.2.2.3 Potassium hydroxide, approximately 28 g/l ethanolic solution.
4.2.2.4 Acetone.
4.2.2.5 Hydrochloric acid, standard solution, c(HCl) = 0,3 mol/l.
4.2.2.6 Lithium chloride, 40 g/l ethanolic solution.
4.2.3 Apparatus
Standard laboratory equipment, plus the following:
4.2.3.1 Potentiometric titrator, with a 10 ml capacity burette graduated every 0,02 ml, a
millivoltmeter or other suitable type of voltmeter, a glass measurement electrode, a silver/silver
chloride reference electrode and a connecting bridge and beaker filled with an ethanolic solution of
lithium chloride (4.2.2.6). Other types of potentiometric titrator may be used.
4.2.3.2 Test tube, capacity 50 ml, for the xylene (4.2.2.1) and the acetone (4.2.2.4).
4.2.3.3 Burette, capacity 5 ml, for the potassium hydroxide solution (4.2.2.3).
4.2.3.4 Pipette, capacity 10 ml, for the hexan-1-ol (4.2.2.2).
4.2.3.5 Flask, capacity 100 ml.
ISO 8985:2022(E)
4.2.3.6 Reflux condenser, at least 300 mm long, in accordance with ISO 4799.
4.2.3.7 Heating apparatus, sand bath, oil bath or heating jacket, adjustable to approximately 200 °C.
4.2.3.8 Analytical balance, with an accuracy of 0,1 mg.
4.2.3.9 Magnetic stirrer.
4.2.4 Procedure
4.2.4.1 Determination
4.2.4.1.1 Weigh a quantity of dry polymer as shown in Table 2 into the flask to the nearest 0,1 mg. The
mass of each sample particle shall be less than approximately 0,05 g.
Table 2 — Guide to the mass of the sample to be used
Assumed vinyl acetate content
Approximate mass of test portion
w(VAC)
g
%
w(VAC) ≤ 2 1
2 < w(VAC) ≤ 5 0,5
5 < w(VAC) ≤ 30 0,2
30 < w(VAC) 0,1
When analysing an unknown sample, first carry out a preliminary test under conditions which are valid
for a copolymer containing 5 % to 30 % vinyl acetate.
4.2.4.1.2 Add 25 ml of xylene (4.2.2.1) to the contents of the flask and 10ml of hexan-1-ol (4.2.2.2)
and 5ml of potassium hydroxide solution (4.2.2.3). Heat the flask, topped with the reflux condenser
(4.2.3.6), for 30 min, using the heating apparatus (4.2.3.7) set at boiling temperature.
4.2.4.1.3 After 30 min, remove the flask from the heating apparatus and allow to cool for 5 min to
6 min., then introduce 35 ml of acetone (4.2.2.4) through the top of the condenser. Remove the condenser
and place the flask (if conical) on the magnetic stirrer (4.2.3.9), otherwise transfer the solution to a
beaker first.
4.2.4.1.4 Immerse the glass electrode (see 4.2.3.1) and one of the ends of the connecting bridge
into the flask or beaker. Immerse the other end of the connecting bridge and the silver/silver chloride
reference electrode (see 4.2.3.1) in the beaker filled with the ethanolic solution of lithium chloride
(4.2.2.6).
4.2.4.1.5 Carry out the potentiometric titration immediately, adding standard hydrochloric acid
(4.2.2.5) until the first drop in potential and stirring all the time. When close to the end point, add acid
in 0,04 ml to 0,06 ml increments.
4.2.4.1.6 When the end point is reached, read off the voltage, in millivolts, on the titrator as well as
the volume of hydrochloric acid added.
The end point of the titration is th
...
The article discusses EN ISO 8985:2022, which is a specification for determining the vinyl acetate (VAC) content of ethylene/vinyl acetate (EVAC) copolymer plastics. The document outlines two categories of methods: "reference methods" and "test methods". The reference methods are used to calibrate the measurement process for determining the VAC content in EVAC copolymers. The test methods, on the other hand, are alternative methods that can be used if they are calibrated using one of the reference methods and demonstrate an acceptable level of repeatability. The purpose of this specification is to aid in the designation of copolymers according to ISO 21301-1.
기사 제목: EN ISO 8985:2022 - 플라스틱 - 에틸렌/비닐 아세테이트 공중합체 (EVAC) 열가소성 - 비닐 아세테이트 함량 측정 (ISO 8985:2022, 수정된 버전 2022-08) 기사 내용: 이 문서는 에틸렌/비닐 아세테이트 (EVAC) 공중합체의 비닐 아세테이트 (VAC) 함량 측정을 위한 두 가지 유형의 방법을 명시합니다. 이 방법은 ISO 21301-1에 따라 해당 공중합체를 지칭하는 데 사용됩니다. 하나는 "참조 방법"이라고 하며, 다른 하나는 "시험 방법"이라고 합니다. "참조 방법"은 에틸렌/비닐 아세테이트 공중합체의 비닐 아세테이트 함량 측정에 사용되는 방법을 보정하는 데 사용됩니다. "시험 방법"은 "참조 방법" 중 하나를 사용하여 보정되고 일정한 허용 반복성을 보인 경우에 사용할 수 있는 다른 방법입니다.
기사 제목: EN ISO 8985:2022 - 플라스틱 - 에틸렌/비닐아세테이트 공중합체 (EVAC) 열가소성 플라스틱 - 비닐아세테이트 함량 결정 (ISO 8985:2022, 수정된 판 2022년 8월) 기사 내용: 이 문서는 에틸렌/비닐아세테이트 (EVAC) 공중합체의 비닐아세테이트 (VAC) 함량 결정을 위한 두 가지 범주의 방법을 규정합니다. 이 방법은 ISO 21301-1에 따라 이러한 공중합체를 지정하는 데 사용됩니다. 하나는 "기준 방법"이라고 불리며, 다른 하나는 "시험 방법"이라고 합니다. "기준 방법"은 에틸렌/비닐아세테이트 공중합체의 비닐아세테이트 함량 결정에 사용되는 방법을 보정하기 위해 사용됩니다. "시험 방법"은 "기준 방법" 중 하나를 사용하여 보정된 경우에만 특정 허용 반복성을 보여줄 경우 사용할 수 있는 다른 방법입니다.
기사 제목: EN ISO 8985:2022 - 플라스틱 - 에틸렌/비닐 아세테이트 공중합체 (EVAC) 열가소성 플라스틱 - 비닐 아세테이트 함량 측정 (ISO 8985:2022, 수정된 버전 2022-08) 기사 내용: 본 문서는 에틸렌/비닐 아세테이트 (EVAC) 공중합체의 비닐 아세테이트 (VAC) 함량을 측정하기 위한 두 가지 방법 범주를 명시한다. 이는 ISO 21301-1에 따라 해당 공중합체를 지정할 때 사용된다. 하나는 "참조 방법"이라고 하며, 다른 하나는 "시험 방법"이라고 불린다. "참조 방법"은 에틸렌/비닐 아세테이트 공중합체의 비닐 아세테이트 함량 측정에 사용되는 방법을 보정하는 데 사용된다. "시험 방법"은 다른 방법으로, 해당 참조 방법 중 하나를 사용하여 보정되며, 정해진 반복성을 갖는 경우에 함께 사용될 수 있다. 이 명세의 목적은 ISO 21301-1에 따라 공중합체를 지정하는 데 도움을 주는 것이다.
記事のタイトル: EN ISO 8985:2022 - プラスチック - エチレン/酢酸ビニル共重合体（EVAC）熱可塑性 - 酢酸ビニル含有量の決定（ISO 8985:2022、修正版2022-08） 記事の内容: この文書は、エチレン/酢酸ビニル（EVAC）共重合体の酢酸ビニル（VAC）含有量を決定するための2つの方法カテゴリーを指定しています。ISO 21301-1に従って、このような共重合体の指定に使用されます。1つは「基準方法」と呼ばれ、もう1つは「試験方法」と呼ばれます。 「基準方法」は、エチレン/酢酸ビニル共重合体の酢酸ビニル含有量の決定に使用される方法を校正するために使用されます。 「試験方法」は、基準方法のいずれかを使用して校正され、一定の許容可能な反復性を示す場合に使用できる他の方法です。
記事のタイトル：EN ISO 8985:2022 - プラスチック - エチレン/酢酸ビニル共重合体（EVAC）熱可塑性プラスチック - 酢酸ビニル含有量の測定（ISO 8985:2022、修正バージョン2022-08） 記事の内容：この文書は、エチレン/酢酸ビニル（EVAC）共重合体の酢酸ビニル（VAC）含有量を測定するための2つの方法のカテゴリを指定しています。これはISO 21301-1に基づいて、そのような共重合体を指定するために使用されます。1つは「参照方法」と呼ばれ、もう1つは「試験方法」と呼ばれます。 「参照方法」は、エチレン/酢酸ビニル共重合体の酢酸ビニル含有量を測定するために使用される方法を較正するために使用されます。 「試験方法」は、他の方法であり、参照方法の1つを使用して較正され、一定の許容可能な再現性を示す場合に使用することができます。この仕様の目的は、ISO 21301-1に従って共重合体を指定するのに役立つことです。
The article discusses the EN ISO 8985:2022 standard, which focuses on the determination of vinyl acetate (VAC) content in ethylene/vinyl acetate (EVAC) copolymers. The standard specifies two categories of methods: reference methods and test methods. Reference methods are used to calibrate the determination of VAC content, while test methods can be used if they are calibrated using one of the reference methods and demonstrate a permissible level of repeatability. This standard allows for standardized measurement of VAC content in EVAC copolymers.
記事タイトル：EN ISO 8985:2022 - プラスチック - エチレン/酢酸ビニル共重合物（EVAC）熱可塑性プラスチック - 酢酸ビニル含有量の測定（ISO 8985:2022、訂正版2022年8月） 記事内容：この文書は、エチレン/酢酸ビニル（EVAC）共重合体の酢酸ビニル（VAC）含有量の測定方法について、2つのカテゴリーの方法を定めています。1つは「基準方法」、もう1つは「試験方法」と呼ばれます。 「基準方法」は、エチレン/酢酸ビニル共重合体の酢酸ビニル含有量測定方法のキャリブレーションに使用されます。 「試験方法」は、基準方法のいずれかを使用してキャリブレーションされ、特定の許容繰り返し性を示す場合にのみ使用できる他の方法です。これらの方法の目的は、ISO 21301-1に従ってEVAC共重合体を指定するために、EVAC共重合体のVAC含有量を正確に測定することです。
The article discusses the EN ISO 8985:2022 standard, which provides guidance on determining the vinyl acetate (VAC) content in ethylene/vinyl acetate (EVAC) copolymers. The standard defines two categories of methods: reference methods, which are used to calibrate the determinations, and test methods, which can be employed if calibrated using one of the reference methods and meet specific repeatability criteria. The purpose of these methods is to accurately measure the VAC content in EVAC copolymers for their designation according to ISO 21301-1.
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