EN ISO 3451-4:2000

SLOVENSKI STANDARD
01-junij-2001
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SIST EN ISO 3451-4:2000
SIST ISO 3451-4:2000
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Plastics - Determination of ash - Part 4: Polyamides (ISO 3451-4:1998)
Kunststoffe - Bestimmung der Asche - Teil 4: Polyamide (ISO 3451-4:1998)
Plastiques - Détermination du taux de cendres - Partie 4: Polyamides (ISO 3451-4:1998)
Ta slovenski standard je istoveten z: EN ISO 3451-4:2000
ICS:
83.080.20 Plastomeri Thermoplastic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 3451-4
Second edition
1998-12-15
Plastics — Determination of ash —
Part 4:
Polyamides
Plastiques — Détermination du taux de cendres —
Partie 4: Polyamides
A
Reference number
ISO 3451-4:1998(E)
ISO 3451-4:1998(E)
Contents
1 Scope .1
2 Normative reference .1
3 Principle.1
3.1 Unfilled materials.1
3.2 Filled and glass-fibre reinforced materials .1
3.3 Flame-retardant materials reinforced with glass fibre.2
4 Reagents (method C or method A in the presence of DBB) .2
5 Apparatus .2
6 Procedure .2
6.1 Test portion .2
6.2 Unfilled materials.3
6.3 Filled and glass-fibre reinforced materials .3
6.4 Materials reinforced with glass fibre containing flame-retardant antimony trioxide and/or other
volatilizable additives.3
7 Expression of results .4
8 Precision.4
9 Test report .4
©  ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
ii
© ISO
ISO 3451-4:1998(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.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 3451-4 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5,
Physical-chemical properties.
This second edition cancels and replaces the first edition (ISO 3451-4:1986), which has been technically revised.
ISO 3451 consists of the following parts, under the general title Plastics — Determination of ash:
 Part 1: General methods
 Part 2: Poly(alkylene terephthalate) materials
 Part 3: Unplasticized cellulose acetate
 Part 4: Polyamides
 Part 5: Poly(vinyl chloride)
iii
INTERNATIONAL STANDARD  © ISO ISO 3451-4:1998(E)
Plastics — Determination of ash —
Part 4:
Polyamides
WARNING — This part of ISO 3451 may involve hazardous chemicals, materials and operations. This part
of ISO 3451 does not purport to address the safety problems associated with its use. It is the responsibility
of the user to establish proper safety and health practices and determine the applicability of regulatory
limitations prior to use.
1 Scope
This part of ISO 3451 specifies methods for determination of the ash of polyamides, both filled and unfilled. The
general procedures given in ISO 3451-1 are followed. For unfilled materials method A or method C of
ISO 3451-1:1997 is used. For filled and glass-fibre reinforced materials method A of ISO 3451-1:1997 is used.
For glass-fibre filled materials containing flame retardant, antimony trioxide, and/or other, volatilizable, additives
such as pigment zinc sulfide, a modification is incorporated to remove these as volatile bromine component(s).
2 Normative reference
The following standard contains provisions which, through reference in this text, constitute provisions of this part of
ISO 3451. At the time of publication, the edition indicated was valid. All standards are subject to revision, and
parties to agreements based on this part of ISO 3451 are encouraged to investigate the possibility of applying the
most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid
International Standards.
ISO 3451-1:1997, Plastics — Determination of ash — Part 1: General methods.
3 Principle
3.1 Unfilled materials
Direct calcination by burning the organic matter and treating the residue at a high temperature until constant mass is
reached (ISO 3451-1:1997, method A).
If the material contains metal halides and/or metals (especially in the presence of halogenated material) which are
liable to evaporate during burning of the organic matter, calcination after sulfation can be applied (ISO 3451-1:1997,
method C). This procedure is carried out by heating the organic matter together with concentrated sulfuric acid up to
a temperature where fuming an
...