EN ISO 8974:1999

SLOVENSKI STANDARD
01-maj-1999
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Plastics - Phenolic resins - Determination of residual phenol content by gas
chromatography (ISO 8974:1997)
Kunststoffe - Phenolharze - Bestimmung des freien Phenols durch Gas-
Chromatographie (ISO 8974:1997)
Plastiques - Résines phénoliques - Dosage du phénol résiduel par chromatographie en
phase gazeuse (ISO 8974:1997)
Ta slovenski standard je istoveten z: EN ISO 8974:1999
ICS:
83.080.10 Duromeri Thermosetting materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 8974
Second edition
1997-12-01
Plastics — Phenolic resins —
Determination of residual phenol content by
gas chromatography
Plastiques — Résines phénoliques — Dosage du phénol résiduel par
chromatographie en phase gazeuse
A
Reference number
ISO 8974:1997(E)
ISO 8974:1997(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. 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. 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 International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 8974 was prepared by Technical Committee
ISO/TC 61, Plastics, Subcommittee SC 12, Thermosetting materials.
This second edition cancels and replaces the first edition (ISO 8974:1988),
which has been technically revised.
Annex A forms an integral part of this International Standard.
©  ISO 1997
All 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 • CH-1211 Genève 20 • Switzerland
Internet central@iso.ch
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Printed in Switzerland
ii
©
INTERNATIONAL STANDARD  ISO ISO 8974:1997(E)
Plastics — Phenolic resins — Determination of residual phenol
content by gas chromatography
1  Scope
This International Standard specifies a gas-chromatographic method for the measurement of
the residual phenol content of phenolic resins. Alkaline resins (i.e. those containing alkali-metal
phenolates) with a pH > 7 may be determined using the modified method given in annex A.
2  Principle
A test specimen is dissolved in a suitable solvent and the phenol content is determined by gas
chromatography.
The apparatus, materials and conditions described are suitable. However, it is possible to use
other apparatus and conditions (for example detectors and columns) if it has been verified that
they give the same results with a precision of the same order of magnitude. In the procedure
described, capillary columns and a flame ionization detector are used.
3  Materials
3.1  Carrier gas: hydrogen, helium or nitrogen.
3.2  Detector gas: hydrogen and air.
m
3.3  Internal standard: -cresol (phenol free), anisole (phenol free) or octanol.
NOTE - If it considered that interference is likely, caused for example by the presence of cresol
in the resin, it is advisable to use anisole or octanol as the internal standard.
4  Apparatus
4.1  Chromatograph
4.1.1  Microsyringe, capable of injecting approximately 0,5 μl of test solution (see 5.3.1).
4.1.2  Injection port, with glass liner to retain non-volatile compounds.
©
ISO
ISO 8974:1997(E)
4.1.3  Capillary column
Type: Quartz capillary
Length: 25 m
Internal diameter: 0,32 mm
1)
Stationary phase: e.g. Permabond OV-1701 (cyanopropylphenylmethylsilane) . Condition for
2 h at 250 °C ± 10 °C before use.
4.1
...