EN ISO 9771:1997

SLOVENSKI STANDARD
SIST EN ISO 9771:1999
01-maj-1999
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Plastics - Phenolic resins - Determination of the pseudo-adiabatic temperature rise of
liquid resols when cured under acid conditions (ISO 9771:1995)
Kunststoffe - Phenolharze - Bestimmung des pseudo-adiabatischen Temperaturanstiegs
flüssiger Resole bei Aushärtung unter sauren Bedingungen (ISO 9771:1995)
Plastiques - Résines phénoliques - Détermination de l'élévation de température
pseudoadiabatique des résols liquides thermodurcis en conditions acides (ISO
9771:1995)
Ta slovenski standard je istoveten z: EN ISO 9771:1997
ICS:
83.080.10 Duromeri Thermosetting materials
SIST EN ISO 9771:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 9771:1999

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SIST EN ISO 9771:1999

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SIST EN ISO 9771:1999

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SIST EN ISO 9771:1999
INTERNATIONAL
IS0
STANDARD 9771
Second edition
1995-05-01
- Phenolic resins -
Plastics
Determination of the pseudo-adiabatic
temperature rise of liquid resols when
cured under acid conditions
- R&sines phbnoliques - D&ermination de I%l6vation de
P/as tiques
tempgrature pseudoadiabatique des r&o/s liquides thermodurcis en
conditions acides
Reference number
IS0 9771 :I 995(E)

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SIST EN ISO 9771:1999
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work
of preparing International Standards is normally carried out through IS0
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. IS0
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 IS0 9771 was prepared by Technical Committee
lSO/TC 61, Plastics, Subcommittee SC 12, Thermosetting materids.
This second edition cancels and replaces the first edition
(IS0 9771:1989), of which it constitutes a minor revision.
0 IS0 1995
Al 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 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
II

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SIST EN ISO 9771:1999
INTERNATIONAL STANDARD 0 Iso IS0 9771:1995(E)
- Determination of the
Plastics - Phenolic resins
pseudo-adiabatic temperature rise of liquid resols
when cured under acid conditions
4.2 Hollow foam block, made of phenolic-resin or
1 Scope
polyurethane-resin foam with an apparent density of
30 kg/m3 to 50 kg/m3 and with a cavity to accommo-
This International Standard specifies a method for
date the reaction vessel (4.1).
determining the exothermic reactivity of thermo-
setting liquid phenolic resins when mixed with an acid
The cavity shall be arranged so that the surface of the
hardener under specified conditions. The results of
reaction mixture lies about 30 mm below the top
the determination are used as a means of assessing
edge of the foam block and so that the reaction vessel
the behaviour of the resin during processing.
sits firmly in the foam material.
The thickness of the thermal-insulation layer between
2 Principle
the reaction vessel and its surroundings shall be at
least 60 mm.
A phenolic resin is mixed with an acid hardener and
allowed to harden. The highest temperature reached
NOTE 1
It is good practice to change the foam block
is measured, as well as the time taken to reach this
periodically since wear of the block can affect the test re-
temperature.
sult.
4.3 Non-metallic cover plate, for the foam block
3 Reagent
(4.2).
3.1 Suitable acid hardener, depending on the
4.4 Thermocouple, with its hot junction immersed
composition of the resin, e.g. pphenol sulfonic acid,
in glycol or other suitable liquid at the bottom of a test
technical grade, 65 % (m/m> k 1 % (m/m> in water.
tube (4.7).
4.5 Temperature recorder.
4 Apparatus
...