SIST EN ISO 8988:2006

Plastics - Phenolic resins - Determination of hexamethylenetetramine content - Kjeldahl method, perchloric acid method and hydrochloric acid method (ISO 8988:2006)

This International Standard specifies three methods for the determination of the hexamethylenetetramine ("hexa") content of phenolic resins. The three methods are equivalent. The Kjeldahl method described in Clause 3 is not applicable if there are other components containing nitrogen in the phenolic resin. The perchloric acid method and the hydrochloric acid method described in Clause 4 and Clause 5, respectively, are only applicable if there are no other basic or acidic additives in the resin. If the resin contains additives which can be oxidized by perchloric acid, only the hydrochloric acid method (Clause 5) is applicable.

Kunststoffe - Phenolharze - Bestimmung des Hexamethylentetramingehaltes - Kjeldahl-Verfahren, Perchlorsäureverfahren und Salzsäureverfahren (ISO 8988:2006)

Diese Internationale Norm legt drei Verfahren zur Bestimmung des Hexamethylentetramin-(Hexa)-Gehaltes von Phenolharzen fest. Die drei Verfahren sind gleichwertig. Das im Abschnitt 3 beschriebene Kjeldahl-Verfahren ist nicht anwendbar, wenn im Phenolharz weitere stickstoffhaltige Bestandteile vorhanden sind. Die in Abschnitt 4 und Abschnitt 5 beschriebenen Perchlorsäure- und Salzsäureverfahren sind nur dann anwendbar, wenn im Harz keine weiteren basischen oder sauren Zusatzstoffe enthalten sind. Wenn das Harz Zusatzstoffe enthält, die durch die Perchlorsäure oxidiert werden können, ist nur das Salzsäureverfahren (siehe Abschnitt 5) anwendbar.

Plastiques - Résines phénoliques - Détermination de la teneur en hexaméthylenetétramine - Méthode Kjeldahl, méthode a l'acide perchlorique et méthode a l'acide chlorhydrique (ISO 8988:2006)

L'ISO 8988:2006 spécifie trois méthodes pour la détermination de la teneur en hexaméthylènetétramine des résines phénoliques: la méthode de Kjeldahl, la méthode à l'acide perchlorique et la méthode à l'acide chlorhydrique.

Polimerni materiali - Fenolne smole - Določevanje heksametilentetramina - Metoda po Kjeldahlu, s perklorno kislino in klorvodikovo kislino (ISO 8988:2006)

General Information

• Status: Published
• Publication Date: 30-Nov-2006
• ICS: 83.080.10 - Thermosetting materials
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2006
• Due Date: 01-Dec-2006
• Completion Date: 01-Dec-2006
• Ref Project: EN ISO 8988:2006 - Plastics - Phenolic resins - Determination of hexamethylenetetramine content - Kjeldahl method, perchloric acid method and hydrochloric acid method (ISO 8988:2006)

Relations

• Replaces: SIST EN ISO 8988:1999 - Plastics - Phenolic resins - Determination of hexamethylenetetramine content - Kjeldahl method and perchloric acid method (ISO 8988:1995)
• Effective Date: 01-Dec-2006

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 8988:2006
01-december-2006
1DGRPHãþD
SIST EN ISO 8988:1999
3ROLPHUQLPDWHULDOL)HQROQHVPROH'RORþHYDQMHKHNVDPHWLOHQWHWUDPLQD0HWRGD
SR.MHOGDKOXVSHUNORUQRNLVOLQRLQNORUYRGLNRYRNLVOLQR,62
Plastics - Phenolic resins - Determination of hexamethylenetetramine content - Kjeldahl
method, perchloric acid method and hydrochloric acid method (ISO 8988:2006)
Kunststoffe - Phenolharze - Bestimmung des Hexamethylentetramingehaltes - Kjeldahl-
Verfahren, Perchlorsäureverfahren und Salzsäureverfahren (ISO 8988:2006)
Plastiques - Résines phénoliques - Détermination de la teneur en
hexaméthylenetétramine - Méthode Kjeldahl, méthode a l'acide perchlorique et méthode
a l'acide chlorhydrique (ISO 8988:2006)
Ta slovenski standard je istoveten z: EN ISO 8988:2006
ICS:
83.080.10 Duromeri Thermosetting materials
SIST EN ISO 8988:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

EUROPEAN STANDARD
EN ISO 8988
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2006
ICS 83.080.10 Supersedes EN ISO 8988:1997
English Version
Plastics - Phenolic resins - Determination of
hexamethylenetetramine content - Kjeldahl method, perchloric
acid method and hydrochloric acid method (ISO 8988:2006)
Plastiques - Résines phénoliques - Détermination de la Kunststoffe - Phenolharze - Bestimmung des
teneur en hexaméthylènetétramine - Méthode Kjeldahl, Hexamethylentetramingehaltes - Kjeldahl-Verfahren,
méthode à l'acide perchlorique et méthode à l'acide Perchlorsäureverfahren und Salzsäureverfahren (ISO
chlorhydrique (ISO 8988:2006) 8988:2006)
This European Standard was approved by CEN on 26 August 2006.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8988:2006: E
worldwide for CEN national Members.

---------------------- Page: 2 ----------------------

EN ISO 8988:2006 (E)





Foreword


This document (EN ISO 8988:2006) has been prepared by Technical Committee ISO/TC 61
"Plastics" in collaboration with Technical Committee CEN/TC 249 "Plastics", the secretariat of
which is held by IBN.

This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by March 2007, and conflicting national
standards shall be withdrawn at the latest by March 2007.

This document supersedes EN ISO 8988:1997.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,
Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.


Endorsement notice

The text of ISO 8988:2006 has been approved by CEN as EN ISO 8988:2006 without any
modifications.

2

---------------------- Page: 3 ----------------------

INTERNATIONAL ISO
STANDARD 8988
Third edition
2006-09-01


Plastics — Phenolic resins —
Determination of hexamethylenetetramine
content — Kjeldahl method, perchloric
acid method and hydrochloric acid
method
Plastiques — Résines phénoliques — Détermination de la teneur en
hexaméthylènetétramine — Méthode Kjeldahl, méthode à l'acide
perchlorique et méthode à l'acide chlorhydrique




Reference number
ISO 8988:2006(E)
©
ISO 2006

---------------------- Page: 4 ----------------------

ISO 8988:2006(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.


©  ISO 2006
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 either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland

ii © ISO 2006 – All rights reserved

---------------------- Page: 5 ----------------------

ISO 8988:2006(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Kjeldahl method. 1
4 Perchloric acid method . 3
5 Hydrochloric acid method . 5
6 Test report . 7

© ISO 2006 – All rights reserved iii

---------------------- Page: 6 ----------------------

ISO 8988:2006(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. 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.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 8988 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 12, Thermosetting
materials.
This third edition cancels and replaces the second edition (ISO 8988:1995), which has been technically
revised to include a hydrochloric acid method.

iv © ISO 2006 – All rights reserved

---------------------- Page: 7 ----------------------

INTERNATIONAL STANDARD ISO 8988:2006(E)

Plastics — Phenolic resins — Determination of
hexamethylenetetramine content — Kjeldahl method, perchloric
acid method and hydrochloric acid method
SAFETY STATEMENT — Persons using this document should be familiar with normal laboratory
practice, if applicable. This document does not purport to address all of the safety concerns, if any,
associated with its use. It is the responsibility of the user to establish appropriate safety and health
practices and to ensure compliance with any regulatory requirements.
1 Scope
This International Standard specifies three methods for the determination of the hexamethylenetetramine
(“hexa”) content of phenolic resins. The three methods are equivalent. The Kjeldahl method described in
Clause 3 is not applicable if there are other components containing nitrogen in the phenolic resin. The
perchloric acid method and the hydrochloric acid method described in Clause 4 and Clause 5, respectively,
are only applicable if there are no other basic or acidic additives in the resin. If the resin contains additives
which can be oxidized by perchloric acid, only the hydrochloric acid method (Clause 5) is applicable.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 385, Laboratory glassware — Burettes
3 Kjeldahl method
WARNING — For safety reasons, the Kjeldahl determination must be carried out in a well ventilated
fume cupboard.
3.1 General
This clause specifies a method for the determination of total nitrogen, expressed as hexamethylenetetramine,
in phenolic resins. The method is applicable to hexamethylenetetramine contents of W 0,5 % (by mass).
3.2 Principle
The hexamethylenetetramine in a test portion is converted to ammonium bisulfate by decomposition in hot
concentrated sulfuric acid in the presence of a catalyst.
The ammonium bisulfate is converted to sodium sulfate and ammonia by reaction with sodium hydroxide.
The ammonia is distilled off and collected in hydrochloric acid.
The exce
...