EN ISO 9944:1995

SLOVENSKI STANDARD
01-maj-1999
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Plastics - Phenolic resins - Determination of electrical conductivity of resin extracts (ISO
9944:1990)
Kunststoffe - Phenolharze - Bestimmung der Leitfähigkeit von Harzextrakten (ISO
9944:1990)
Plastiques - Résines phénoliques - Détermination de la conductivité électrique des
extraits de résine (ISO 9944:1990)
Ta slovenski standard je istoveten z: EN ISO 9944:1995
ICS:
83.080.10 Duromeri Thermosetting materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL
STANDARD
First edi tion
1990-12-15
-- -- ----- ---
Plastics - Phenolic resins - Determination of
electrical conductivity of resin extracts
- Resines phenoliques - Determination de la conductivitt2
Plastiques
electrique des extra& de resine
Reference number
ISO 9944: 199O(E)
ISO 9944:1990(E)
Foreward
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 9944 was prepared by Technical Committee
ISO/TC 61, F)lastics.
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-121 1 Geneve 20 l Switzerland
Printed in Switzerland -
ii
Determination of electrical
Plastics - Phenolic resins -
conductivity of resin extracts
4.4 Magnetit stirrer.
1 Scope
4.5 Balance, scale interval 1 mg.
This International Standard specifies a method for
the determination of the electrical conductivity of
phenolic resin extracts at 23 OC + 2 “C.
-
5 Procedure
The method is important for applications in which
5.1 Preparation of test Portion
such resins are used as impregnating materials.
In the case of resin solutions, weigh out
2 Principle
10 g + 0,05 g of the solution into a 250 ,ml beaker
(4.3).% the case of powdered solid resins, take 8 g
An acetone/water mixture is added to a solution of
of the resin and dissolve it in acetone (3.1) in a ratio
the resin. The precipitate thus produced is allowed
by mass of 1:l. Weigh out
...