SIST EN ISO 305:2019
(Main)Plastics - Determination of thermal stability of poly(vinyl chloride), related chlorine-containing homopolymers and copolymers and their compounds - Discoloration method (ISO 305:2019)
Plastics - Determination of thermal stability of poly(vinyl chloride), related chlorine-containing homopolymers and copolymers and their compounds - Discoloration method (ISO 305:2019)
This document specifies two methods for the determination of the thermal stability of products and compounds based on vinyl chloride homopolymers and copolymers (referred to simply as PVC in the following text) by the extent of the discoloration that occurs when they are exposed, in the form of sheet, to elevated temperatures. The two methods are:
— Method A: Oil-bath method;
— Method B: Oven method.
These methods are particularly applicable to the determination of the resistance of PVC to degradation by heat, as assessed by the change in colour after different times of heating under standardized conditions. The results are comparative only, and can be unsatisfactory when coloured PVC materials are tested.
The stability times given by the two methods might not be similar and cannot be used for direct-comparison purposes.
Kunststoffe - Bestimmung der Thermostabilität von Polyvinylchlorid (PVC), verwandten chlorhaltigen Homopolymeren und Copolymeren und ihren Formmassen - Verfärbungsverfahren (ISO 305:2019)
In diesem Dokument werden zwei Verfahren festgelegt, mit denen die Thermostabilität von Erzeugnissen und Formmassen aus vinylchloridhaltigen Homopolymeren und Copolymeren (im weiteren Text als PVC bezeichnet) aus der Verfärbung bestimmt wird, die auftritt, wenn sie in Form von Tafeln erhöhten Temperaturen ausgesetzt werden. Die beiden Verfahren sind:
Verfahren A: Ölbadverfahren;
Verfahren B: Ofenverfahren.
Diese beiden Verfahren sind besonders zur Bestimmung der Beständigkeit von PVC gegen thermische Abbauvorgänge anwendbar, die durch die Verfärbung von Probekörpern nach unterschiedlicher Erwärmungsdauer unter genormten Bedingungen beurteilt wird. Die Ergebnisse sind lediglich vergleichend; bei der Prüfung gefärbter PVC-Werkstoffe können unbefriedigende Ergebnisse anfallen.
Die nach den beiden Verfahren ermittelten Stabilitätszeiten sind möglicherweise nicht ähnlich und können nicht für direkte Vergleichszwecke verwendet werden.
Plastiques - Détermination de la stabilité thermique du poly(chlorure de vinyle), des homopolymères et copolymères chlorés apparentés et de leurs compositions - Méthode du changement de couleur (ISO 305:2019)
Le présent document spécifie deux méthodes pour la détermination de la stabilité thermique des produits et compositions à base d'homopolymères et de copolymères de polychlorure de vinyle (désignés simplement par PVC dans le texte qui suit), par l'importance du changement de couleur qui se produit lorsqu'ils sont exposés à des températures élevées, sous forme de feuilles. Ces deux méthodes sont les suivantes :
— Méthode A : Méthode au bain à huile ;
— Méthode B : Méthode à l'étuve.
Ces méthodes conviennent pour déterminer la résistance du PVC à la dégradation par la chaleur, par appréciation des changements de couleur après différents temps de chauffage dans des conditions normalisées. Les résultats sont seulement comparatifs, ils peuvent être peu satisfaisants lorsque du PVC coloré est soumis à l'essai.
Les temps de stabilité donnés par les deux méthodes peuvent ne pas être similaires et ils ne peuvent pas être utilisés pour des comparaisons directes.
Polimerni materiali - Določanje toplotne stabilnosti polivinilklorida, sorodnih homo- in kopolimerov ter njihovih zmesi, ki vsebujejo klor - Metoda razbarvanja (ISO 305:2019)
Ta dokument določa dve metodi za določitev toplotne stabilnosti izdelkov in spojin na osnovi homopolimerov in kopolimerov vinilklorida (v besedilu krajše poimenovanih PVC) glede na stopnjo spremembe barve, ki se pojavi, ko so v obliki listov izpostavljeni povišanim temperaturam. Omenjeni metodi sta:
– Metoda A: Metoda z oljno kopeljo;
– Metoda B: Metoda s pečjo.
Metodi sta posebej uporabni za določanje odpornosti PVC na razgradnjo zaradi toplote, ocenjeno s spremembo barve po različnih časih segrevanja v standardiziranih pogojih. Rezultati so zgolj primerjalni in so lahko pri preskušanju obarvanih PVC-materialov nezadovoljivi.
Časi stabilnosti, ki jih podajata metodi, morda ne bodo podobni in jih ne bo mogoče uporabiti za namen neposredne primerjave.
General Information
- Status
- Published
- Public Enquiry End Date
- 24-Apr-2019
- Publication Date
- 04-Jul-2019
- Technical Committee
- IPMA - Polimer materials and products
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 20-Jun-2019
- Due Date
- 25-Aug-2019
- Completion Date
- 05-Jul-2019
Relations
- Effective Date
- 19-Jun-2019
- Effective Date
- 23-Dec-2015
Overview
EN ISO 305:2019 (ISO 305:2019) - published by CEN/ISO - specifies two standardized discoloration methods to determine the thermal stability of poly(vinyl chloride) (PVC), related chlorine‑containing homopolymers and copolymers, and their compounds. The standard assesses resistance to heat degradation by measuring the extent and timing of colour change when sheet specimens are exposed at elevated temperatures. Results are comparative and intended for quality control, formulation development and research.
Key topics and technical requirements
- Two test methods
- Method A - Oil‑bath method: specimens are heated in a thermostatically controlled oil bath (120 °C to 200 °C capability) with restricted air access using aluminium blocks and cylinders to limit oxidation.
- Method B - Oven method: specimens are heated in a forced‑air circulation oven on clean aluminium foil; suitable only where cross‑contamination during oven exposure is not a concern.
- Specimen preparation
- Method A: discs, 14 mm diameter, ~1 mm thick.
- Method B: squares, 15 mm side, ~1 mm thick.
- Granules, powders or plastisols must be formed into sheet (ISO 293 referenced for sheet preparation).
- Test conditions
- Test temperature is defined by material specification or agreement; default if unspecified is 180 °C.
- Number of specimens: generally equal to expected test time (minutes) ÷ 5 (shorter intervals can be used for high‑stability materials).
- Oil bath temperature control: typically ±0.5 °C.
- Results and limitations
- Results are comparative only - stability times from Methods A and B may differ and are not directly comparable.
- The discoloration method can be unsuitable for already coloured PVC (results may be misleading).
Applications and users
- Typical uses
- Comparative assessment of PVC thermal stability and heat‑degradation resistance.
- Evaluation of stabilizers, additives and formulations during R&D.
- Routine quality control of PVC compounds and production batches.
- Material selection and specification verification for heat‑exposed PVC products.
- Who uses it
- PVC compounders and polymer manufacturers
- Materials and polymer testing laboratories
- Product designers and specifiers in building, electrical, automotive, and industrial sectors
- Regulatory bodies and conformity assessment labs
Related standards
- ISO 293 (referenced in EN ISO 305:2019) - guidance for preparing sheets from PVC granules/powders for testing.
- Use EN ISO 305:2019 alongside other PVC test methods when comprehensive thermal and mechanical characterization is required.
Keywords: EN ISO 305:2019, ISO 305:2019, PVC thermal stability, discoloration method, oil‑bath method, oven method, plastics testing, PVC stabilizers.
Frequently Asked Questions
SIST EN ISO 305:2019 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Plastics - Determination of thermal stability of poly(vinyl chloride), related chlorine-containing homopolymers and copolymers and their compounds - Discoloration method (ISO 305:2019)". This standard covers: This document specifies two methods for the determination of the thermal stability of products and compounds based on vinyl chloride homopolymers and copolymers (referred to simply as PVC in the following text) by the extent of the discoloration that occurs when they are exposed, in the form of sheet, to elevated temperatures. The two methods are: — Method A: Oil-bath method; — Method B: Oven method. These methods are particularly applicable to the determination of the resistance of PVC to degradation by heat, as assessed by the change in colour after different times of heating under standardized conditions. The results are comparative only, and can be unsatisfactory when coloured PVC materials are tested. The stability times given by the two methods might not be similar and cannot be used for direct-comparison purposes.
This document specifies two methods for the determination of the thermal stability of products and compounds based on vinyl chloride homopolymers and copolymers (referred to simply as PVC in the following text) by the extent of the discoloration that occurs when they are exposed, in the form of sheet, to elevated temperatures. The two methods are: — Method A: Oil-bath method; — Method B: Oven method. These methods are particularly applicable to the determination of the resistance of PVC to degradation by heat, as assessed by the change in colour after different times of heating under standardized conditions. The results are comparative only, and can be unsatisfactory when coloured PVC materials are tested. The stability times given by the two methods might not be similar and cannot be used for direct-comparison purposes.
SIST EN ISO 305:2019 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.
SIST EN ISO 305:2019 has the following relationships with other standards: It is inter standard links to SIST EN ISO 305:2000, SIST EN ISO 305:2000. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST EN ISO 305:2019 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2019
Nadomešča:
SIST EN ISO 305:2000
Polimerni materiali - Določanje toplotne stabilnosti polivinilklorida, sorodnih
homo- in kopolimerov ter njihovih zmesi, ki vsebujejo klor - Metoda razbarvanja
(ISO 305:2019)
Plastics - Determination of thermal stability of poly(vinyl chloride), related chlorine-
containing homopolymers and copolymers and their compounds - Discoloration method
(ISO 305:2019)
Kunststoffe - Bestimmung der Thermostabilität von Polyvinylchlorid (PVC), verwandten
chlorhaltigen Homopolymeren und Copolymeren und ihren Formmassen -
Verfärbungsverfahren (ISO 305:2019)
Plastiques - Détermination de la stabilité thermique du poly(chlorure de vinyle), des
homopolymères et copolymères chlorés apparentés et de leurs compositions - Méthode
du changement de couleur (ISO 305:2019)
Ta slovenski standard je istoveten z: EN ISO 305:2019
ICS:
83.080.20 Plastomeri Thermoplastic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 305
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2019
EUROPÄISCHE NORM
ICS 83.080.20 Supersedes EN ISO 305:1999
English Version
Plastics - Determination of thermal stability of poly(vinyl
chloride), related chlorine-containing homopolymers and
copolymers and their compounds - Discoloration method
(ISO 305:2019)
Plastiques - Détermination de la stabilité thermique du Kunststoffe - Bestimmung der Thermostabilität von
poly(chlorure de vinyle), des homopolymères et Polyvinylchlorid (PVC), verwandten chlorhaltigen
copolymères chlorés apparentés et de leurs Homopolymeren und Copolymeren und ihren
compositions - Méthode du changement de couleur Formmassen - Verfärbungsverfahren (ISO 305:2019)
(ISO 305:2019)
This European Standard was approved by CEN on 26 May 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, North
Macedonia, 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 305:2019 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 305:2019) 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 December 2019, and conflicting national standards
shall be withdrawn at the latest by December 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 305:1999.
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 305:2019 has been approved by CEN as EN ISO 305:2019 without any modification.
INTERNATIONAL ISO
STANDARD 305
Third edition
2019-05
Plastics — Determination of thermal
stability of poly(vinyl chloride), related
chlorine-containing homopolymers
and copolymers and their compounds
— Discoloration method
Plastiques — Détermination de la stabilité thermique du poly(chlorure
de vinyle), des homopolymères et copolymères chlorés apparentés et de
leurs compositions — Méthode du changement de couleur
Reference number
ISO 305:2019(E)
©
ISO 2019
ISO 305:2019(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
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Published in Switzerland
ii © ISO 2019 – All rights reserved
ISO 305:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
4.1 Method A: Oil-bath method . 1
4.2 Method B: Oven method . 2
5 Preparation and number of test specimens . 2
6 Test temperature . 2
7 Method A: Oil-bath method . 2
7.1 Apparatus . 2
7.2 Procedure . 3
8 Method B: Oven method . 3
8.1 Apparatus . 3
8.2 Procedure . 4
9 Expression of results . 4
10 Precision . 5
11 Test report . 5
Bibliography . 6
ISO 305:2019(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).
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