EN ISO 11402:1998

SLOVENSKI STANDARD
SIST EN ISO 11402:2000
01-maj-2000
3ROLPHUQLPDWHULDOL3ROLNRQGHQ]DWL'RORþHYDQMHSURVWHJDIRUPDOGHKLGD,62

Plastics - Condensation resins - Determination of free formaldehyde (ISO 11402:1993)
Kunststoffe - Kondensationsharze - Bestimmung des freien Formaldehyds (ISO
11402:1993)
Plastiques - Résines de condensation - Détermination du formaldéhyde libre (ISO
11402:1993)
Ta slovenski standard je istoveten z: EN ISO 11402:1998
ICS:
83.080.10 Duromeri Thermosetting materials
SIST EN ISO 11402:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 11402:2000

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SIST EN ISO 11402:2000

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SIST EN ISO 11402:2000

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SIST EN ISO 11402:2000

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SIST EN ISO 11402:2000

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SIST EN ISO 11402:2000
INTERNATIONAL ISO
11402
STANDARD
First edition
1993-11-15
Plastics - Condensation resins -
Determination of free formaldehyde
Plas tiques - Msines de condensation - Determination du
formaldeh yde libre
Reference number
ISO 11402:1993(E)

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SIST EN ISO 11402:2000
ISO 11402:1993(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, governmental
and non-governmental, in liaison with 60, 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 11402 was prepared by Technical Committee
ISO/TC 61, Plastics, Sub-Committee SC 12, Thermosetting materials.
Annexes A and B of this International Standard are for information only.
0 ISO 1993
All rights resetved. No par-t of this publication may be reproduced or utilized in any form or
by any means, electronie or mechanical, including photocopying and microfilm, without per-
mission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1 211 Geneve 20 l Switzerland
Printed in Switzerland

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SIST EN ISO 11402:2000
INTERNATIONAL STANDARD
ISO 11402:1993(E)
Plastics - Condensation resins - Determination of
free formaldehyde
cation, the editions indicated were valid. All Standards
1 Scope
are subject to revision, and Parties to agreements
based on this International Standard are encouraged
This International Standard specifies test methods for
to investigate the possibility of applying the most re-
the determination of free formaldehyde in conden-
cent editions of the Standards indicated below.
sation resins, including Urea resins, furan resins,
Members of IEC and ISO maintain registers of cur-
melamine resins and phenolic resins, as well as com-
rently valid International Standards.
binations and modifications of these resins.
ISO 3696: 1987, Water for analytical laboratory use -
The purpose of this International Standard is to es-
tablish recognized and useful determination pro- Specifica tion and tes t me thods.
cedures (for instance in Order to check whether
ISO 9020: -l), Binders for paints and varnishes -
official regulations on the handling of hazardous
Determination of free-formaldeh yde con ten t of amino
workplace materials are observed). As far as possible,
resins - Sodium sulfite titrimetric method.
all formaldehyde-containing resins are to be included
in this connection. The free formaldehyde determined
ISO 9397:1989, Plastics - Phenolic resins - Deter-
in formaldehyde condensation resins according to this
mina tion of free formaldehyde con ten t.
International Standard establishes the actual condition
at the time of the test. The value has no quantitative
relationship to free formaldehyde that may arise dur-
3 Definition
ing or after processing.
For the purposes of this International Standard, the
following definition applies.
2 Normative references
3.1 free formaldehyde: Formaldehyde that is pres-
The following Standards contain provisions which, ent in unbound form as formaldehyde, formaldehyde
through reference in this text, constitute provisions dihydrate (dihydroxymethylene) or polyoxymethylene
of this International Standard. At the time of publi- in a condensation resin.
1) To be published.
1

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SIST EN ISO 11402:2000
ISO 11402:1993(E)
4.3.2 Reactions
4 Test procedures
The analytical procedure is based on the following re-
The choice of test procedure for the determination of
actions:
free formaldehyde in condensation resins is made in
accordance with table 1.
a) CH,0 + KCN (excess) + NC-CH,-OK
Table 1 - Selection of procedure
PH 7
b) 2KCN + Hg(NO,), ---> 2KN0, + Hg(CN),
Procedure Suitable for testing of
Hydroxylammonium Phenolic resins, furan resins’)
4.3.3 Reagents
chloride procedure (unmodified with urea or
melamine resin)
During the analysis, use only reagents of recognized
Sulfite procedure Urea resins, melamine resins,
analytical grade and only distilled or de-ionized water
furan resins’), Urea-melamine
of at least grade 3 as defined in ISO 3696.
resins, furan-urea resins
KCN procedure*) Melamine-phenolic resins, urea-
4.3.3.1 /V,A/‘-dimethylformamide.
phenolic resins, urea-melamine-
phenolic resins
4.3.3.2 Nitrit acid, c(HNO$ = 2 mol/l.
1) See annex A, A.Z.
4.3.3.3 Potassium cyanide Solution, c(KCN) =
2) See annex A, A.3.
0,l mol/l.
The concentration of the potassium cyanide Solution
shall be checked weekly against a Standard reference
Solution of mercury(ll) nitrate (4.3.3.6).
4.1 Hydroxylammonium chloride procedure
4.3.3.4 Phosphate buffer Solution.
The determination is carried out in accordance with
Dissolve 348 g of K,HPO, and 136 g of KH,PO, in
ISO 9397.
water and make up to 1 000 ml.
4.3.3.5 Borate buffer Solution.
4.2 Sulfite procedure
Dissolve 76,4 g of K,B,0,.4H,O in water and make
up to 1 000 ml.
The determination is carried out in accordance with
ISO 9020.
4.3.3.6 Mercury(ll) nitrate Solution, c[Hg(NO,),] =
0,05 mol/l.
A dilute Solution of formaldehyde of known concen-
4.3 KCN procedure
tration (e.g. 3,6 g/l) is used to determine the formal-
dehyde equivalent of the mercuty(ll) nitrate Solution.
WARNING - Potassium cyanide is a very toxic
Use 10 ml of this Solution (corresponding to 36 mg
material. It must be handled very carefully. In
of formaldehyde) for the determination. See annex A
contact with ac
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