EN ISO 1600:1999

SLOVENSKI STANDARD
01-maj-2000
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Plastics - Cellulose acetate - Determination of light absorption on moulded specimens
produced using different periods of heating (ISO 1600:1990)
Kunststoffe - Celluloseacetat - Bestimmung der Lichtabsorption an gepreßten
Probekörpern, hergestellt bei unterschiedlichen Erwärmungszeiten (ISO 1600:1990)
Plastiques - Acétate de cellulose - Détermination de l'absorption de lumiere sur
éprouvettes moulées produites en utilisant différentes périodes de chauffage (ISO
1600:1990)
Ta slovenski standard je istoveten z: EN ISO 1600:1999
ICS:
83.080.20 Plastomeri Thermoplastic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL
STANDARD 1600
Second edi tion
1990-12-0 1
Plastics - Cellulose acetate - Determination
of light absorption on moulded specimens
produced using different periods of heating
Plastiques - Acetate de cellulose - Determination de I’absorption de
lumiere SW- eprouvettes moukes produites en utilisant differentes
pkiodes de chauffage
--
Reference number
ISO 1600: 199O(E)
ISO 1600:1990(E)
Foreword
ISO (the international Organ‘ization 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 lnter-
national Standard requires approval by at least 75 % of the member
bodies casting a vote.
International Standard ISO 1600 was prepared by Technical Committee
ISO/TC 61, Plastics.
This second edition cancels and replaces the h-st edition
(ISO 1600:1975), 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 Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 * Switzerland
Printed in Switzerland
ii
ISO 1600:1990(E)
INTERNATIONAL STANDARD
Plastics - Cellulose acetate - Determination of light
absorption on moulded specimens produced using different
periods of heating
WARNING - The use of this International Standard may involve hazardous materials, operations and
equipment. This Standard does not purport 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.
are encouraged to investigate the possibility of ap-
1 Scope
plying the most recent editions of the Standards in-
dicated below. Members of IEC and ISO maintain
This International Standard specifies a method for
registers of currently valid International Standards,
the determination of light absorption of cellulose
acetate, employing test specimens taken from two
ISO 5653990, Test sieves - Metal wire cloth, perfo-
mouldings which have been produced using differ-
rated metal plate and electroformed sheet - Nominal
ent periods of heating.
sizes of openings.
The aim is to provide quantitative measurements
which are compatible with visual judgements of ISO 585: 1 9901), Plastics - Unplas ticized cellulose
acetate - Determination of moisture content.
yellowness and lightness, and of changes in these
properties after moulding. The determinations are
carried out on cellulose acetate in plasticized form
rather than in solution, since a more reliable guide
3 Principle
is thereby obtained to the Performance of cellulose
acetate in plastics materials.
The absorption of visible light by cellulose acetate
is normally greatest at the blue end of the visible
This method min imizes the effects of haze or
spectrum, and decreases continuously across the
in th i
imperfections e spec mens
spectrum to the red end. Therefore two measure-
This method is intended for cellulose acetate having ments of absorption, one at the red end and one at
an acetic acid yield of 54 % + 25 %. lt may also be the blue end, are sufficient to characterize the ab-
sorption of light by the material.
applicable to other transparent plastics which are
not strongly coloured and which tan be moulded
For the determination of the initial Optical density,
under the specified conditions.
specimens given the smallest practicable amount
of heating are used. The Optical densities are
measured for blue light and for red light using
2 Normative references
specified colour filters, and the Optical density at
25 mm thickness is calculated as the “initial light
The following Standards contain provisions which,
absorption”.
through reference in this text, constitute provisions
The “light absorption after further heating” is ob-
of this International Standard. At the time of publi-
tained by similar measurements on further speci-
cation, the editions indicated were valid. All stan-
mens prepared using a longer period of heating
dards are subject to revision, and Parties to
during moulding.
agreements based on this International Standard
1) To be published.
ISO 1600:1990(E)
5.5 Oven, capable of being thermostatically main-
4 Reagents
tained at 60 “C + 2 “C or 70 “C + 2 “C.
-
-
he determ ination use only r ,eagents of rec-
During t >
alytical grade, free from v isible colour.
ognized an
6 Test Sample
4.1 Dimethyl phthalate, analytical grade, L$: 1,194
6.1 If proceeding in accordance with 7.1.1 (first
to 1,195, purity more than 99 % (m/m).
method of incorporating the plasticizer), the Sample
of cellulose acetate shall be in the form of powder
4.2 Triacetin. passing entirely through a sieve of 710 pm mesh
size (as defined in ISO 565); it shail be ground if
necessaty, avoiding excessive heating of the sam-
4.3 Ethyl lactate.
ple.
4.4 Acetone.
lf proceedincj in accordance with 7.1.2 (second
method of incorporating the plasticizer), the cellu-
SAFETY PRECAUTIONS - Acetone is highly
lose acetate need not be ground.
flammable. Keep the Container in a well ventilated
place and away from sources of ignition. DO not
6.2 Determine the moisture content of the Sample
smoke. Take precautionary measures against static
in accordance with ISO 585.
discharges.
4.5 Propan-2-01.
7 Procedure
SAFETY PRECAUTIONS - Propan-2-ol is highly
flammable. Keep the Container tightly closed and
7.‘l Eit
...