SIST EN ISO 305:2000
(Main)Plastics - Determination of thermal stability of poly(vinyl chloride), related chlorine-containing homopolymers and copolymers and their compounds - Discoloration method (ISO 305:1990)
Plastics - Determination of thermal stability of poly(vinyl chloride), related chlorine-containing homopolymers and copolymers and their compounds - Discoloration method (ISO 305:1990)
Specification of a comparing method, based on the increasing discoloration of polyvinylchloride when exposed to heat, due to a decomposition reaction. Test pieces in diskform are placed between aluminium pieces and heated to the specified test temperature. After specified periods one test specimen at a time is taken out and the degree of discoloration assessed by visual examination or by measuring with a photometer.
Kunststoffe - Bestimmung der Thermostabilität von Polyvinylchlorid (PVC), verwandten chlorhaltigen Homopolymeren und Copolymeren und ihren Formmassen - Verfärbungsverfahren (ISO 305:1990)
Plastiques - Détermination de la stabilité thermique du poly(chlorure de vinyle), des homopolymeres et copolymeres chlorés apparentés et de leurs compositions - Méthodes du changement de couleur (ISO 305:1990)
La présente Norme internationale prescrit deux méthodes pour la détermination de la stabilité thermique du polychlorure de vinyle, des homopolymères et copolymères chlorés apparentés et de leur compositions, par l'importance du changement de couleur qui se produit lorsqu'ils sont exposés à une température élevée, sous la forme de feuilles. - 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 lorsqu'on essaie du PVC coloré. La méthode A est une méthode simple, avec des coûts d'appareillage réduits et permet de soumettre les matériaux à l'essai presque en absence d'air. La méthode B exige une étuve à circulation d'air forcée, dans laquelle la distribution de l'air doit être réglée de façon à maintenir une température suffisamment constante dans toute la zone d'essai. Cette méthode n'est pas applicable aux matériaux qui peuvent se contaminer réciproquement pendant l'essai. Les temps de stabilité donnés par les deux méthodes peuvent n'être pas similaires et ne peuvent pas être comparés directement.
Polimerni materiali - Določanje toplotne stabilnosti polivinilklorida, sorodnih homo- in kopolimerov in njihovih zmesi, ki vsebujejo klor - Metoda razbarvanja (ISO 305:1990)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 305:2000
01-maj-2000
3ROLPHUQLPDWHULDOL'RORþDQMHWRSORWQHVWDELOQRVWLSROLYLQLONORULGDVRURGQLKKRPR
LQNRSROLPHURYLQQMLKRYLK]PHVLNLYVHEXMHMRNORU0HWRGDUD]EDUYDQMD ,62
Plastics - Determination of thermal stability of poly(vinyl chloride), related chlorine-
containing homopolymers and copolymers and their compounds - Discoloration method
(ISO 305:1990)
Kunststoffe - Bestimmung der Thermostabilität von Polyvinylchlorid (PVC), verwandten
chlorhaltigen Homopolymeren und Copolymeren und ihren Formmassen -
Verfärbungsverfahren (ISO 305:1990)
Plastiques - Détermination de la stabilité thermique du poly(chlorure de vinyle), des
homopolymeres et copolymeres chlorés apparentés et de leurs compositions - Méthodes
du changement de couleur (ISO 305:1990)
Ta slovenski standard je istoveten z: EN ISO 305:1999
ICS:
83.080.20 Plastomeri Thermoplastic materials
SIST EN ISO 305:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 305:2000
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SIST EN ISO 305:2000
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SIST EN ISO 305:2000
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SIST EN ISO 305:2000
INTERNATIONAL ISO
STANDARD
305
Second edition
1990-04-0 1
Plastics - Determination of thermal stability of
poly(vinyl chloride), related chlorine-containing
homopolymers and copolymers and their
compounds - Discoloration method
Determination de Ia stabilite thermique du poly(chlorure
Plastiques -
de vinyle), des homopolym&res et copolymkes chlor& apparentes et de
leurs compositions - Methode du changement de couleur
Reference number
ISO 305: 199O(E)
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SIST EN ISO 305:2000
ISO 305:1990(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. Esch 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, govern-
mental 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.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an Interna-
tional Standard requires approval by at least 75 % of the member bodies
casting a vote.
International Standard ISO 305 was prepared by Technical Committee
ISO/TC 61, Plastics.
This second edition cancels and replaces the first edition (ISO
305:1976), of which it constitutes a technical revision.
0 ISO 1990
All rights reserved. No patt of this pubiication may be reproduced or utiiized in any form
or by any means, eiectronic or mechanicai, inciuding photocopying and microfllm, without
Permission in writing from the pubiisher.
international Organization for Standardization
Case Postaie 56 l CH-1211 Geneve 20 l Switzeriand
Printed in Switzerland
ii
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SIST EN ISO 305:2000
INTERNATIONAL STANDARD ISO 305:1990(E)
Plastics - Determination of thermal stability of poly(vinyl
chloride), related chlorine-containing homopolymers and
copolymers and their compounds - Discoloration method
1 Scope 2 Principle
2.1 Method A: Oil-bath method
A series of test specimens is heated at an elevated
1.1 This International Standard specifies two
temperature for different lengths of time in a
methods for the determination of the thermal stabil-
temperature-controlled oil bath. The test specimens
ity of products and compounds based on Vinyl
are placed between an aluminium block and an al-
chloride homopolymers and copolymers (referred to
uminium cylinder to promote heat transfer and re-
simply as PVC in the following text) by the extent of
stritt air access.
the discoloration that occurs when they are ex-
posed, in the form of sheet, to elevated temper-
atures.
2.2 Method B: Oven method
- Method A: Oil-bath method
A series of test specimens is heated at an elevated
temperature for different lengths of time in a
- Method B: Oven method
forced-air-circulation oven. The test specimens are
supported by new, clean aluminium foil laid on re-
movable racks.
1.2 These methods are particularly applicable to
3 Preparation and number of test
the determination of the resistance of PVC to de-
specimens
gradation by heat, as assessed by the Change in
colour after different times of heating under stand-
3.1 The test specimens shall consist of
ardized conditions. The results are comparative
only, and may be unsatisfactory when coloured PVC
- discs of diameter 14 mm and thickness approxi-
materials are tested.
mately 1 mm, for method A;
-
squares of side 15 mm and thickness approxi-
mately 1 mm, for method B.
1.3 Method A is a simple method, which requires
little expenditure on apparatus and permits materi-
They shall be punched out from the sheets to be
als to be tested almost in the absence of air.
tested.
Method B requires a forced-air oven, in which the
3.2 The number of test specimens required is the
air flow is adjusted to provide a sufficiently uniform
expected time of the test in minutes divided by 5. If
temperature throughout the entire test area. This
the stability of the compound is very high, remove
method is not applicable to materials that will
the test specimens every 10 to 15 minutes instead
Cross-contaminate during oven exposure.
of every 5 minutes during the first Stage of heating,
before the appearance of discoloration. Thus, the
The stability times given by the two methods may
number of test specimens used tan be less than that
not be similar and cannot be used for direct-
specified above.
comparison purposes.
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SIST EN ISO 305:2000
ISO 305:1990(E)
Dimensions in millimetres
3.3 lf the material to be tested is an extrusion or
moulding material in granule, powder or pellet form,
this shall be sheeted on a roll-mill under the condi-
tions specified in the material specification, or as
upon between the interested Parties
agreed
- Compression moulding fest
(ISO 293: 1986, Plastics
specimens of thermoplastic materials, may be help-
ful in this respect).
3.4 If the material to be tested is in the form of a
Paste (plastisol), it shall be gelled to give a well
fused sheet; the test specimens shall be punched
out from the sheet thus obtained.
Figure 1 - Aluminium block
NOTES
1 If the surface finish of specimens (particularly those
made from unplasticized materials) prepared by milling
...
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