EN ISO 9020:1998

Binders for paints and varnishes - Determination of free-formaldehyde content of amino resins - Sodium sulfite titrimetric method (ISO 9020:1994, including Technical Corrigendum 1:1996)

This standard specifies a titrimetric method for determining the free-formaldehyde content of amino resins.

Bindemittel für Beschichtungsstoffe - Bestimmung des Gehaltes an freiem Formaldehyd in Aminharzen - Titrimetrisches Verfahren mit Natriumsulfit (ISO 9020:1994, einschließlich Technische Korrektur 1:1996)

Diese Internationale Norm legt ein titrimetrisches Verfahren zum Bestimmen des Gehaltes an freiem Formaldehyd in Aminharzen fest. Sie ist ohne weitere Änderungen anwendbar für Harze, die durch Polykondensation von Harnstoff und Melamin mit Formaldehyd hergestellt wurden und für Furanharze, die durch Polykondensation von Furfuryalkohol mit Formaldehyd hergestellt wurden. Das Verfahren ist nicht für phenolharzmodifizierte Furanharze anwendbar.

Liants pour peintures et vernis - Dosage du formaldéhyde libre dans les résines aminoplastes - Méthode titrimétrique au sulfite de sodium (ISO 9020:1994, Rectificatif technique 1:1996 inclus)

IEC 60079-0:2011 est disponible sous forme de IEC 60079-0:2011 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
IEC 60079-0:2011 spécifie les exigences générales de construction, d'essais et de marquage du matériel électrique et des Composants Ex destinés à être     utilisés  dans des  atmosphères explosives. Equipement électrique conforme à cette norme     est destiné   dans les  zones dangereuses dans lequel   les atmosphères explosives de gaz, causées  par des mélanges d'air et   de  gaz, de vapeurs ou de brouillards, existent dans des conditions atmosphériques normales. Les conditions  atmosphériques normales (relatives aux caractéristiques d'explosion  de l'atmosphère) dans lesquelles il peut  être supposé que l'appareil électrique peut être     utilisé sont   les suivantes:
- température de -20 °C à +60 °C;
- pression de 80 kPa (0,8 bar) à 110 kPa (1,1 bar) et;
- air avec teneur normale en oxygène, typiquement 21 % v/v.
La présente norme et les autres normes qui la complètent spécifient des exigences d'essai supplémentaires pour les équipements fonctionnant hors de la plage de température normale, une attention supplémentaire ultérieure et des essais complémentaires pouvant toutefois se révéler nécessaires pour les équipements fonctionnant hors de la plage de pression atmosphérique normale et de la teneur normale en oxygène, notamment pour les modes de protection qui dépendent de l'extinction d'une flamme tel qu'une "enveloppe antidéflagrante "d" (CEI 60079-1) ou de la limitation de l'énergie tel que la "sécurité intrinsèque "i"" (CEI 60079-11). Cette sixième édition annule et remplace la cinquième édition publiée en 2007 dont elle constitue une révision technique complète. Le contenu du corrigendum de novembre 2012, la feuille d'interprétation 1 de novembre 2013, le corrigendum de decembre 2013 et la feuille d'interprétation 2 d'octobre 2014 a été pris en considération dans cet exemplaire.

Veziva za barve in lake - Določanje prostega formaldehida v amino smolah - Titracijska metoda z natrijevim sulfitom (ISO 9020:1994, vključno s tehničnim popravkom 1:1996)

General Information

• Status: Withdrawn
• Publication Date: 21-Apr-1998
• Withdrawal Date: 02-May-2006
• ICS: 87.060.20 - Binders
• Technical Committee: CEN/TC 139 - Paints and varnishes
• Drafting Committee: CEN/TC 139 - Paints and varnishes
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 03-May-2006
• Completion Date: 03-May-2006
• Ref Project: SIST EN ISO 9020:1998 - Binders for paints and varnishes - Determination of free-formaldehyde content of amino resins - Sodium sulfite titrimetric method (ISO 9020:1994, including Technical Corrigendum 1:1996)

Relations

• Replaced By: EN ISO 11402:2005 - Phenolic, amino and condensation resins - Determination of free-formaldehyde content (ISO 11402:2004)
• Effective Date: 22-Dec-2008

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 9020:1998
01-avgust-1998
9H]LYD]DEDUYHLQODNH'RORþDQMHSURVWHJDIRUPDOGHKLGDYDPLQRVPRODK
7LWUDFLMVNDPHWRGD]QDWULMHYLPVXOILWRP,62YNOMXþQRVWHKQLþQLP
SRSUDYNRP
Binders for paints and varnishes - Determination of free-formaldehyde content of amino
resins - Sodium sulfite titrimetric method (ISO 9020:1994, including Technical
Corrigendum 1:1996)
Bindemittel für Beschichtungsstoffe - Bestimmung des Gehaltes an freiem Formaldehyd
in Aminharzen - Titrimetrisches Verfahren mit Natriumsulfit (ISO 9020:1994,
einschließlich Technische Korrektur 1:1996)
Liants pour peintures et vernis - Dosage du formaldéhyde libre dans les résines
aminoplastes - Méthode titrimétrique au sulfite de sodium (ISO 9020:1994, Rectificatif
technique 1:1996 inclus)
Ta slovenski standard je istoveten z: EN ISO 9020:1998
ICS:
87.060.20 Veziva Binders
SIST EN ISO 9020:1998 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 9020:1998

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SIST EN ISO 9020:1998

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SIST EN ISO 9020:1998

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SIST EN ISO 9020:1998

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SIST EN ISO 9020:1998

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SIST EN ISO 9020:1998
INTERNATIONAL IS0
9020
STANDARD
First edition
1994-02-l 5
Binders for paints and varnishes -
Determination of free-formaldehyde
content of amino resins - Sodium sulfite
titrimetric method
- Dosage du formald6hyde libre dans /es
Liants pour peintures et vemis
Gsines aminoplas tes - MBthode titrimbtrique au sulfite de sodium
Reference number
IS0 9020: 1994(E)

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SIST EN ISO 9020:1998
IS0 9020:1994(E)
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
(I EC) 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 9020 was prepared by Technical Committee
lSO/TC 35, Paints and varnishes, Subcommittee SC 10, Test methods for
binders for paints and varnishes.
0 IS0 1994
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 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
II

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SIST EN ISO 9020:1998
INTERNATIONAL STANDARD 0 IS0 IS0 9020: 1994(E)
Determination of
Binders for paints and varnishes -
Sodium
free-formaldehyde content of amino resins -
sulfite titrimetric method
.
1 Scope
This International Standard specifies a titrimetric method for determining the free-formaldehyde content of amino
resins. It is applicable to resins resulting from the polycondensation of urea and melamine with formaldehyde and
to furan resins resulting from the polycondensation of furfuryl alcohol with formaldehyde without further modifi-
cation.
The method is not applicable to furan resins modified with phenolic resins.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the possi-
bility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain
registers of currently valid International Standards.
IS0 385-l : 1984, Laboratory glassware - Burettes - Part I: General requirements.
IS0 648: 1977, Laboratory glassware - One-mark pipettes.
IS0 842: 1984, Raw materials for paints and varnishes - Sampling.
IS0 3696: 1987, Water for analytical laboratory use - Specification and test methods.
3 Principle
The method is based on the following reactions:
pH = 9,2 to 9,4
a) CH,O + Na,SO, (excess) + H,O > HOCH,-SO,Na + NaOH
15 min
pH = 9,2 to 9,4
b) ROCH,OH + Na,SO, (excess) + H,O > HOCH,-SO,Na + ROH + NaOH
15 min
0 “C
c) >N-CH,OH + Na,SO, -> no reaction under the test conditions

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SIST EN ISO 9020:1998
IS0 9020: 1994(E)
25
45
PH I
d) Excess Na,SO, + I, + H,O
> Na,SO, + 2 HI
Ri 45
I
PH
e) HOCH,-SO,Na + I, > no reaction under the test conditions
pH = 9 to 10
f) HOCH,-SO,Na + Na,CO, > CH,O + Na,SO, + NaHCO,
g) Na,SO, + I, + H,O -> Na,SO, + 2 HI
Free formaldehyde and alcohol formaldehyde semiacetals in a test portion are reacted with excess sodium sulfite
solution at a temperature of 0 “C to form hydroxymethane sulfonate. The excess sodium sulfite is titrated with
iodine solution. The hydroxymethane sulfonate is decomposed with sodium carbonate solution and the sodium
sulfite liberated is titrated with iodine solution.
4 Reagents and materials
During the analysis, use only reagents of recognized analytical grade and only water of at least grade 3 purity as
defined in IS0 3696.
4.1 Sodium sulfite solution, c(Na,SO,) = 1 mol/l.
4.2 Acetic acid, c(CH,COOH) = 1 mol/l.
4.3 Sodium carbonate solution, c(Na,CO,) = 100 g/l.
4.4 Buffer solution.
Dissolve 12,37 g of boric acid in water in a 1 000 ml one-mark volumetric flask, add 100 ml of 1 mol/l sodium
hydroxide solution, dilute to the mark with water and mix well.
Before use, cool the solution to 0 “C.
4.5 Iodine, standard volumetric solution, c(Y&) = 0,l mol/l, i.e. 12,690 g/l. If necessary, standardize the solution
against standard volumetric sodium thiosulfate solution, c(Na,S,O,) = 0,l mol/l.
4.6 Dichloromethane, neutral (pH = 7).
Before use, cool the dichloromethane to 0 “C.
4.7 Starch, dissolved in hot water to give a IO g/l solution, or powdered starch, soluble in cold water (so-called
Zulkovsky starch is suitable).
4.8 Water containing ice, prepared from water of at least grade 3 purity as defined in IS0 3696.
4.9 Ice, finely divided
...