EN ISO 15023-2:2019

Plastics - Poly(vinyl alcohol) (PVAL) materials - Part 2: Determination of properties (ISO 15023-2:2019)

This document specifies the methods to be used in determining the properties of poly(vinyl alcohol), which is normally prepared by hydrolysis of poly(vinyl acetate) and whose composition comprises vinyl alcohol monomeric units and vinyl acetate monomeric units. This document is applicable to poly(vinyl alcohol) with a vinyl alcohol unit content (degree of hydrolysis) from 70 mol% to 100 mol%.
In addition to the designatory properties specified in ISO 15023-1 (degree of hydrolysis and viscosity of an aqueous solution), this document includes a number of other properties which are commonly used to specify PVAL materials (see Table 1).

Kunststoffe - Polyvinylalkohol (PVAL)-Werkstoffe - Teil 2: Bestimmung von Eigenschaften (ISO 15023-2:2019)

Dieses Dokument legt die Verfahren fest, die bei der Bestimmung der Eigenschaften von Polyvinylalkohol anzuwenden sind, der gewöhnlich durch Hydrolyse von Poly(vinylacetat) hergestellt wird und dessen Zusammensetzung monomere Einheiten von Vinylalkohol und von Vinylacetat einschließt. Dieses Dokument gilt für Polyvinylalkohol mit einem Gehalt an Vinylalkoholeinheiten (Hydrolysegrad) von 70 % (Stoffmengenkonzentration) bis 100 % (Stoffmengenkonzentration).
Zusätzlich zu den in ISO 15023 1 festgelegten kennzeichnenden Eigenschaften (Hydrolysegrad und Viskosität einer wässrigen Lösung) enthält dieses Dokument eine Reihe von weiteren Eigenschaf¬ten, die gewöhnlich für die Spezifikation von PVAL Werkstoffen verwendet werden (siehe Tabelle 1).

Plastiques - Matériaux en poly(alcool de vinyle) (PVAL) - Partie 2: Détermination des propriétés (ISO 15023-2:2019)

Le présent document spécifie les méthodes à utiliser pour déterminer les propriétés du poly(alcool de vinyle), normalement préparé par hydrolyse du poly(acétate de vinyle) et qui comprend, dans sa composition, des monomères d'alcool de vinyle et des monomères d'acétate de vinyle. Le présent document s'applique aux poly(alcool de vinyle) ayant une teneur en monomères d'alcool de vinyle (degré d'hydrolyse) allant de 70 mol % à 100 mol %.
Outre les propriétés de désignation spécifiées dans l'ISO 15023‑1 (degré d'hydrolyse et viscosité d'une solution aqueuse), le présent document inclut un certain nombre d'autres propriétés communément utilisées pour spécifier les matériaux en PVAL (voir Tableau 1).

Polimerni materiali - Materiali na osnovi polivinilalkohola (PVAL) - 2. del: Ugotavljanje lastnosti (ISO 15023-2:2019)

Ta dokument določa metode za ugotavljanje lastnosti polivinilalkohola, ki se običajno pripravlja s hidrolizo polivinilacetata in katerega sestava zajema monomerne enote vinilalkohola ter monomerne enote vinilacetata. Ta dokument se uporablja za polivnilalkohol z vsebnostjo enote vinilalkohola (stopnjo hidrolize) od 70 do 100 mol%.
Poleg označevalnih lastnosti, določenih v standardu ISO 15023-1 (stopnja hidrolize in viskoznosti vodne raztopine), ta dokument vključuje številne druge lastnosti, ki se pogosto uporabljajo za opredelitev materialov PVAL (glej preglednico 1).

General Information

• Status: Published
• Publication Date: 09-Apr-2019
• Withdrawal Date: 30-Oct-2019
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: CEN/TC 249 - Plastics
• Drafting Committee: CEN/TC 249 - Plastics
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 10-Apr-2019
• Completion Date: 10-Apr-2019
• Ref Project: SIST EN ISO 15023-2:2019 - Plastics - Poly(vinyl alcohol) (PVAL) materials - Part 2: Determination of properties (ISO 15023-2:2019)

Relations

• Replaces: EN ISO 15023-2:2006 - Plastics - Poly(vinyl alcohol) (PVAL) materials - Part 2: Determination of properties (ISO 15023-2:2003)
• Effective Date: 08-Jun-2022

Overview

EN ISO 15023-2:2019 - Plastics - Poly(vinyl alcohol) (PVAL) materials - Part 2: Determination of properties is the CEN-adopted ISO standard that defines laboratory methods for measuring the key physical and chemical properties of poly(vinyl alcohol) (PVAL). It applies to PVAL prepared by hydrolysis of poly(vinyl acetate) with a vinyl alcohol unit content (degree of hydrolysis) from 70 mol% to 100 mol%. The document updates and supersedes earlier editions and is intended for consistent specification and testing of PVAL materials.

Key topics

• Scope and applicability: Test methods for PVAL materials within the stated degree-of-hydrolysis range; complements designatory properties defined in ISO 15023-1.
• Properties and test conditions (Table 1): Lists required properties and standard test conditions, including:
  • Volatile-matter content (Annex A) - mass loss at 105 °C for 3 h.
  • Sodium acetate content (Annex B) - determined by titration or conductivity methods.
  • Ash calculation (Annex C) - for inorganic residue determination.
  • Degree of hydrolysis (Annex D) - titration-based method to report mol% hydrolysis.
  • Viscosity of 4% aqueous solution (Annex E) - measured by rotational (Brookfield) or inclined‑tube falling‑ball viscometer at 20 °C.
  • Particle size distribution - referenced to ISO 8130-1 (sieving).
  • pH of aqueous solution - referenced to ISO 976 (4.0 ± 0.2% concentration).
• Normative references: ISO 8130-1, ISO 976, ISO 6587, ISO 12058-1 and others referenced for specific procedures and instrumentation.
• Reporting requirements: Specifies how to calculate, average duplicates, and report test results.

Applications

EN ISO 15023-2:2019 is used by:

• Manufacturers for product specification, batch release and internal quality control of PVAL resins.
• Independent testing laboratories to perform accredited, repeatable property determinations.
• Procurement and specification teams to define acceptance criteria in purchase specifications and supplier contracts.
• R&D and formulation scientists who require standardized property data for material selection and comparison.

Practical value includes ensuring consistent measurement of degree of hydrolysis, viscosity, residual salts (sodium acetate), volatile content and ash - all critical for performance, processing and compatibility of PVAL in downstream applications.

Related standards

• ISO 15023-1 - Designatory properties of PVAL (degree of hydrolysis, viscosity).
• ISO 8130-1 - Particle size by sieving.
• ISO 976 - pH of polymer dispersions.
• ISO 12058-1 - Falling-ball viscometer (inclined-tube method).
• ISO 6587 - Conductivity of aqueous extracts.

Keywords: EN ISO 15023-2:2019, poly(vinyl alcohol), PVAL, degree of hydrolysis, viscosity, volatile-matter, sodium acetate, ash, particle size, pH, Brookfield viscometer, falling-ball.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2019
Nadomešča:
SIST EN ISO 15023-2:2006
Polimerni materiali - Materiali na osnovi polivinilalkohola (PVAL) - 2. del:
Ugotavljanje lastnosti (ISO 15023-2:2019)
Plastics - Poly(vinyl alcohol) (PVAL) materials - Part 2: Determination of properties (ISO
15023-2:2019)
Kunststoffe - Polyvinylalkohol (PVAL)-Formmassen - Teil 2: Bestimmung von
Eigenschaften (ISO 15023-2:2019)
Plastiques - Matériaux en poly(alcool de vinyle) (PVAL) - Partie 2: Détermination des
propriétés (ISO 15023-2:2019)
Ta slovenski standard je istoveten z: EN ISO 15023-2:2019
ICS:
83.080.20 Plastomeri Thermoplastic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 15023-2
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2019
EUROPÄISCHE NORM
ICS 83.080.20 Supersedes EN ISO 15023-2:2006
English Version
Plastics - Poly(vinyl alcohol) (PVAL) materials - Part 2:
Determination of properties (ISO 15023-2:2019)
Plastiques - Matériaux en poly(alcool de vinyle) (PVAL) Kunststoffe - Polyvinylalkohol (PVAL)-Werkstoffe - Teil
- Partie 2: Détermination des propriétés (ISO 15023- 2: Bestimmung von Eigenschaften (ISO 15023-2:2019)
2:2019)
This European Standard was approved by CEN on 8 February 2019.

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, 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,
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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15023-2:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 15023-2:2019) 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 October 2019, and conflicting national standards shall
be withdrawn at the latest by October 2019.
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 15023-2:2006.
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, 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,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 15023-2:2019 has been approved by CEN as EN ISO 15023-2:2019 without any
modification.
INTERNATIONAL ISO
STANDARD 15023-2
Second edition
2019-02
Plastics — Poly(vinyl alcohol) (PVAL)
materials —
Part 2:
Determination of properties
Plastiques — Matériaux en poly(alcool de vinyle) (PVAL) —
Partie 2: Détermination des propriétés
Reference number
ISO 15023-2:2019(E)
©
ISO 2019
ISO 15023-2:2019(E)
© ISO 2019
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: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 15023-2:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Determination of properties . 1
Annex A (normative) Determination of volatile-matter content . 3
Annex B (normative) Determination of sodium acetate content . 5
Annex C (normative) Calculation of ash . 8
Annex D (normative) Determination of degree of hydrolysis . 9
Annex E (normative) Determination of viscosity of 4 % aqueous solution by the Brookfield
test method or the inclined-tube falling-ball method .12
Bibliography .18
ISO 15023-2:2019(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.
This second edition cancels and replaces the first edition (ISO 15023-2:2003), which has been
technically revised. The main changes compared to the previous edition are as follows:
— the normative references have been updated;
— adjustments have been made due to a new designation system in ISO 15023-1.
A list of all parts in the ISO 15023 series can be found on the ISO website.
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.
iv © ISO 2019 – All rights reserved

INTERNATIONAL STANDARD ISO 15023-2:2019(E)
Plastics — Poly(vinyl alcohol) (PVAL) materials —
Part 2:
Determination of properties
1 Scope
This document specifies the methods to be used in determining the properties of poly(vinyl alcohol),
which is normally prepared by hydrolysis of poly(vinyl acetate) and whose composition comprises vinyl
alcohol monomeric units and vinyl acetate monomeric units. This document is applicable to poly(vinyl
alcohol) with a vinyl alcohol unit content (degree of hydrolysis) from 70 mol% to 100 mol%.
In addition to the designatory properties specified in ISO 15023-1 (degree of hydrolysis and viscosity of
an aqueous solution), this document includes a number of other properties which are commonly used to
specify PVAL materials (see Table 1).
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 976, Rubber and plastics — Polymer dispersions and rubber latices — Determination of pH
ISO 6587, Paper, board and pulps — Determination of conductivity of aqueous extracts
ISO 8130-1, Coating powders — Part 1: Determination of particle size distribution by sieving
ISO 12058-1, Plastics — Determination of viscosity using a falling-ball viscometer — Part 1: Inclined-
tube method
3 Terms and definitions
No terms and definitions are listed in this document.
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 http: //www .electropedia .org/
4 Determination of properties
In the determination of properties and the presentation of results, the standards, methods and special
conditions listed in Table 1 shall apply. The properties listed in Table 1 are those appropriate to
poly(vinyl alcohol).
ISO 15023-2:2019(E)
Table 1 — Properties and test conditions
Test conditions and supplementary
Property Method Unit
instructions
Volatile-matter content Annex A % by mass 105 °C, 3 h
Sodium acetate content Annex B % by mass Titration or conductivity method
Ash Annex C % by mass void
Degree of hydrolysis Annex D mol% Titration method
Viscosity of 4 % aqueous Annex E mPa⋅s Rotational or inclined-tube falling-ball
solution
viscometer, 20 °C
Particle size distribution ISO 8130-1 % void
pH of aqueous solution ISO 976 — Concentration (4,0 ± 0,2) %
2 © ISO 2019 – All rights reserved

ISO 15023-2:2019(E)
Annex A
(normative)
Determination of volatile-matter content
A.1 Overview
This annex specifies the method to be used for the determination of the volatile-matter content of PVAL.
A.2 Principle
The volatile-matter content is calculated from the loss in mass of a specimen heated at 105 °C for 3 h.
A.3 Test method
A.3.1 Apparatus
A.3.1.1 Constant-temperature oven, able to maintain a temperature of (105 ± 2) °C.
A.3.1.2 Weighing dish, shallow, about 60 mm in diameter and 30 mm in height, of glass, aluminium or
preferably stainless steel, with a lid.
A.3.1.3 Balance, capable of weighing to 0,001 g.
A.3.1.4 Desiccator, containing silica gel as a drying agent.
A.3.2 Procedure
Carry out the determination in duplicate.
Weigh the dish (A.3.1.2) with its lid to the nearest 0,001 g (m ), after heating it in the oven (A.3.1.1)
maintained at (105 ± 2) °C for 1 h and cooling it to room temperature in the desiccator (A.3.1.4). Spread
about 5 g of PVAL resin evenly over the bottom of the dish, replace the lid and weigh to the nearest
0,001 g (m ). Place the assembly in the oven at (105 ± 2) °C, remove the lid (leaving it in the oven) and
close the oven door. After 3 h ± 5 min, remove the assembly from the oven (lid on), allow to cool in the
desiccator and weigh to the nearest 0,001 g (m ).
ISO 15023-2:2019(E)
A.4 Expression of results
Calculate the volatile-matter content, w , as a percentage by mass using Formula (A.1):
VM
mm−
w =×100 (A.1)
VM
mm−
where
m is the mass, in g, of the dish;
m is the initial mass, in g, of the dish plus test portion;
m is the mass, in g, of the dish plus test portion after heating.
Calculate the mean of the results of the two determinations and express the final result to two places of
decimals.
A.5 Test report
The test report shall include the following particulars:
a) a reference to this document, i.e. ISO 15023-2:2019;
b) all details necessary for complete identification of the material tested;
c) the volatile-matter content, calculated as the arithmetic mean of the two determinations;
d) the individual results of the two determinations;
e) the date of the test.
4 © ISO 2019 – All rights reserved

ISO 15023-2:2019(E)
Annex B
(normative)
Determination of sodium acetate content
B.1 Overview
This annex specifies the method to be used for the determination of the sodium acetate content of PVAL.
The content can be determined either by a titration method or by a conductivity method. Additives can
interfere with the determination, and these methods may not be suitable for PVAL containing them.
B.2 Principle
B.2.1 Titration method
The sample is dissolved in water and the solution titrated with hydrochloric acid using methylene blue
and methyl yellow mixture as indicator. The sodium acetate content is calculated as a percentage by mass.
B.2.2 Conductivity method
The conductivity of an aqueous solution of the sample is measured in a conductometer. The sodium
acetate content of the solution is determined by calibrating the conductometer with solutions containing
known amounts of sodium acetate.
B.3 Titration method
B.3.1 Reagents
B.3.1.1 Hydrochloric acid, 0,1 mol/l.
B.3.1.2 Methylene blue/methyl yellow mixed indicator, mixed methylene blue/methyl yellow
indicator, prepared by mixing equal parts of a 0,1 % solution of methylene blue in reagent-grade ethanol
with a 0,1 % solution of methyl yellow in reagent-grade ethanol.
B.3.2 Apparatus
B.3.2.1 Conical flask, 300 ml, with ground-glass stopper.
B.3.2.2 Cylinder, 200 ml, graduated in 2 ml.
B.3.2.3 Burette, 50 ml, graduated in 0,1 ml.
B.3.3 Procedure
Carry out the determination in duplicate.
Weigh about 5 g of sample to the nearest 0,001 g into the conical flask (B.3.2.1), add about 150 ml of
water and dissolve by heating.
ISO 15023-2:2019(E)
A sample with a low degree of hydrolysis may sometimes cause the solution to become turbid. If this
occurs, cool the solution slowly while stirring gently. Alternatively, a 3:1 water/methanol mixture may
be used.
After dissolution, cool and titrate with 0,1 mol/l hydrochloric acid to an end point where the solution
turns from green to light purple.
Carry out a blank test separately.
B.3.4 Expression of results
Calculate the sodium acetate content, w , as a percentage by mass using Formula (B.1):
NaAc
VV− ××cM
()
10 NaAc
w = ×100 (B.1)
NaAc
m×1000
where
V is the volume, in ml, of hydrochloric acid required for the test solution;
V is the volume, in ml, of hydrochloric acid required for the blank;
c is the actual concentration, in mol/l, of the hydrochloric acid;
M is the molecular mass of sodium acetate, in g/mol (82,03 g/mol);
NaAc
m is the mass, in g, of the test portion.
Calculate the mean of the results of the two determinations and express the final result to two places of
decimals.
In high alkali and low alkali PVAL manufacturing process sodium hydroxide may be present in the
product sample, special attention should be drawn to the influence of sodium hydroxide on sodium
acetate and hydrolysis result. However, if the determination result of sodium acetate is merely used for
ash content calculation, the influence could be ignored.
B.4 Conductivity method
B.4.1 Reagent
B.4.1.1 Sodium acetate, reagent grade.
B.4.2 Apparatus
B.4.2.1 Conical flask, 100 ml, with ground-glass stopper.
B.4.2.2 Cylinder, 100 ml, graduated in 1 ml.
B.4.2.3 Conductivity meter, as specified in ISO 6587.
B.4.2.4 Thermometer, graduated in 0,1 °C.
B.4.2.5 Volumetric flask, 100 ml, with grou
...