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
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Dec-2006
Due Date
01-Dec-2006
Completion Date
01-Dec-2006

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SLOVENSKI STANDARD
SIST EN ISO 8988:2006
01-december-2006
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SIST EN ISO 8988:1999
3ROLPHUQLPDWHULDOL)HQROQHVPROH'RORþHYDQMHKHNVDPHWLOHQWHWUDPLQD0HWRGD
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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.
---------------------- 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)
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© 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.
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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
...

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