EN ISO 1061:1999

SLOVENSKI STANDARD
01-maj-2000
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Plastics - Unplasticized cellulose acetate - Determination of free acidity (ISO 1061:1990)
Kunststoffe - Weichmacherfreies Celluloseacetat - Bestimmung der freien Säure (ISO
1061:1990)
Plastiques - Acétate de cellulose non plastifié - Détermination de l'acidité libre (ISO
1061:1990)
Ta slovenski standard je istoveten z: EN ISO 1061:1999
ICS:
83.080.20 Plastomeri Thermoplastic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL
STANDARD
Second edi tion
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Plastics - Unplasticized cellulose acetate -
Determination of free acidity
Plastiques - Aceiafe de celhlose non pfaslifie - D6terminafion de
I’acidife libre
Reference number
ISO ?061:1990(E)
ISO 1061:199O(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 Inter-
national Standard requires approval by at least 75 % of the member
bodies casting a vote.
International Standard ISO 1061 was prepared by Technical Committee
ISO/TC 61, Plastics.
This second edition cancels and replaces the first edition
(ISO 1061:1975), of which it constitutes a minor technical revision.
0 ISO 1990
All rights reserved. No part of this publication may be reproduced or utilized in any form
or by any means, electronie or mechanical, including photocopying and microfilm, without
Permission in writing from the publisher.
International Organizati on for Standardiz ation
l Swi tz erland
Case Postale 56 + CH-l 21 1 Geneve 20
Printed in Switzerland
ii
INTERNATIONAL STANDARD ISO 1061:199O(E)
- Unplasticized cellulose acetate - Determination of
Plastics
free acidity
WARNING - The use of this International Standard may involve hazardous materials, operations and
equipment. This Standard does not Purpott to address all of the safety Problems associated with its use.
lt is the responsibility of the user of this Standard to establish appropriate safety and health practices
and determine the applicability of regulatory limitations Prior to use.
3 Principle
1 Scope
A test Portion of cellulose acetate is tt-eated with
This International Standard specifies a rnethod for
water and the resultant Solution titrated with sodium
the determination of the amount of free acid in
unplasticized cellulose acetate. hydroxide Solution.
The free acidity is calculated as the percentage, by
The ft-ee acidity determined by this method includes
acidity extractable by water and acidity due to acidic mass, of free acetic acid in the cellulose acetate.
groups directly attached to the cellulose acetate,
e-g. carboxyl groups. The latter is usually a very
small proportion of the total.
4 Reagents
This method is not suitable for cellulose acetate
During the determination, use only reaqents of re-
containing any additives which may affect the test.
cognized analytical grade and dis
...