ISO 4660:1991
(Main)Rubber, raw natural — Colour index test
Rubber, raw natural — Colour index test
Caoutchouc naturel brut — Essai d'indice de couleur
General Information
Relations
Standards Content (Sample)
INTERNATIONAL
STANQARD
Second edition
1991-02-01
Rubber, raw natura1 - Colour index test
Caoutchouc naturel brut - Essai d’indice de couleur
Reference number
ISO 4660:1991(E)
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ISO 4660:1991(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 4660 was prepared by Technical Committee
ISO/TC 45, Rubber and rubber products.
This second edition cancels and replaces the first edition (ISO
4660:1977), of which it constitutes a technical revision.
0 ISO 1991
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.
ation
International Orga nization for Stand ardiz
Case Postale 56 0 CH-121 1 Geneve 20 l Switzerland
Printed in Switzerland
ii
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INTERNATIONAL STANDARD
ISO 4660:1991 (E)
Rubber, raw natura1 - Colour index test
1 Scope 4 Apparatus
This International Standard specifies a method of
4.1 Laboratory mill, conforming to the require-
determining the colour of raw natura1 rubber ac-
ments of ISO 2393.
cording to a Standard colour scale.
4.2 Mould, of stainless steel or aluminium,
1,6 mm & 0,05 mm thick, having cavities approxi-
2 Normative references
mately 14 mm in diameter with two mould covers of
similar material, 1 mm to 2 mm thick. A suitable
The following Standards contain provisions which,
mould is illustrated in figure 1.
through reference in this text, constitute provisions
of this International Standard. At the time of publi-
4.3 Platen press, capable of applying a pressure of
cation, the editions indicated were valid. All stan-
not less than 3,5 MPa over the platen surfaces and
dards are subject to revision, and Parties to
maintaining platen temperatures of 150 *C + 3 “C.
agreements based on this International Standard
Platens with lateral dimensions of 200 mm
are encouraged to investigate the possibility of ap-
x 200 mm are suitable.
plying the most recent editions of the Standards in-
dicated below. Members of IEC and ISO maintain
4.4 Punch, for preparation of the test pieces.
registers of currently valid International Standards.
The purpose of the Punch is to produce test pieces
ISO 1796:1982, Rubber, raw - Sample preparation.
of approximately constant volume quickly and with-
out difficulty. The Punch shall consist of a flat-ended
ISO 2393:1973, Rubber fest mixes - Preparation,
cylindrical anvil and a coaxial tubular knife moving
mixing and vulcanization - Equipment and pro-
independently of one another; a Single action of the
cedures.
handle shall compress a Portion of the material to
a thickness of approximately 3 mm and shall tut out
a disc of approximately 13 mm diameter. The test
3 Principle
piece need only be approximately constant in vol-
ume because the final shaping to exact dimensions
The raw rubber is prepared in the form of a moulded
is carried out in the mould during the pre-heating
disc of specified thickness, and the colour of this
period.
disc is compared and matched as closely as poss-
ible with that of Standard glasses. Colour matthing
NOTE 1 This is identical with the test piece punch de-
is carried out under diffuse daylight illumination
scribed in ISO 2007:1981 Rubber, unvulcanized - Deter-
against a matt white background, preferably by use
mination of plasticity - Rapid plastimeter method.
of a comparator which suitably locates and shrouds
the test piece and Standard glass.
4.5 Transparent polyester or cellulose film, ap-
proximately 0,025 mm thick.
The Standard glasses used are calibrated according
to the intensity of their colour (amber) to provide a
colour index scale in which the higher index values 4.6 Comparator, as illustrated in figure 2 or as
correspond to darker colours. available commercially.
1
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ISO 4660:1991 (E)
4.7 Standard coloured glasses, conforming to the the sheet between Passes) between the m
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