Plastics - Polyurethane raw materials - Determination of isocyanate content (ISO 14896:2009)

ISO 14896:2009 specifies two methods for the measurement of the isocyanate content of aromatic isocyanates used as polyurethane raw materials. Method A is primarily applicable to refined toluene diisocyanate (TDI), methylene-bis-(4-phenylisocyanate) (MDI) and their prepolymers. Method B is applicable to refined, crude or modified isocyanates derived from toluene diisocyanate, methylene-bis-(4-phenylisocyanate) and polymethylene polyphenylisocyanate. It can also be used for isomer mixtures of toluene diisocyanate, methylene-bis-(4-phenylisocyanate) and polymethylene polyphenylisocyanate. Other aromatic isocyanates may be analysed by this method if precautions are taken to verify suitability. It is not applicable to blocked isocyanates.

Kunststoffe - Polyurethanrohstoffe - Bestimmung des Isocyanatanteils (ISO 14896:2009)

Diese Internationale Norm legt zwei Verfahren zur Bestimmung des Isocyanatanteils von aromatischen Isocyanaten fest, die als Polyurethanrohstoff verwendet werden. Verfahren A ist in erster Linie auf reines Toluoldiisocyanat (TDI), 4,4´-Methylendi-(phenylisocyanat) (MDI) und deren Vorpolymere anwendbar. Ver-fahren B ist auf reine, rohe oder modifizierte, von Toluoldiisocyanat, 4,4´-Methylendi-(phenylisocyanat) und Polymethylenpolyphenylisocyanat abgeleitete Isocyanate anwendbar. Es kann auch bei Isomergemischen von Toluoldiisocyanat, 4,4´-Methylendi-(phenylisocyanat) und Polymethylenpolyphenylisocyanat Anwendung finden. Wenn die Eignung des Verfahrens vorsorglich nachgewiesen wurde, dürfen auch andere aromatische Isocyanate damit analysiert werden. Das Verfahren ist nicht auf inaktivierte Isocyanate anwendbar.

Plastiques - Matières premières des polyuréthannes - Détermination de la teneur en isocyanate (ISO 14896:2009)

L'ISO 14896:2009 spécifie deux méthodes pour la détermination de la teneur en isocyanate des isocyanates aromatiques utilisés comme matières premières pour polyuréthannes. La méthode A est principalement applicable au toluylène-diisocyanate (TDI), au méthylène-bis-(4-phénylisocyanate) (MDI) purifiés et à leurs prépolymères. La méthode B est applicable aux isocyanates purifiés, bruts ou modifiés dérivés du toluylène-diisocyanate, du méthylène-bis-(4-phénylisocyanate) et du polyméthylène polyphénylisocyanate. Cette méthode peut également être utilisée avec les mélanges d'isomères de toluylène-diisocyanate, de méthylène-bis-(4-phénylisocyanate) et de polyméthylène polyphénylisocyanate. D'autres isocyanates aromatiques peuvent être analysés selon cette méthode si l'on prend soin de vérifier son adéquation. La présente méthode n'est pas applicable aux isocyanates séquencés.

Polimerni materiali - Surovine za poliuretane - Določevanje izocianata (ISO 14896:2009)

General Information

Status
Published
Publication Date
14-Feb-2009
Technical Committee
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
15-Feb-2009
Completion Date
15-Feb-2009

RELATIONS

Buy Standard

Standard
EN ISO 14896:2009
English language
16 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN ISO 14896:2009
01-maj-2009
1DGRPHãþD
SIST EN ISO 14896:2002
3ROLPHUQLPDWHULDOL6XURYLQH]DSROLXUHWDQH'RORþHYDQMHL]RFLDQDWD ,62

Plastics - Polyurethane raw materials - Determination of isocyanate content (ISO
14896:2009)

Kunststoffe - Polyurethanrohstoffe - Bestimmung des Isocyanatanteils (ISO 14896:2008)

Plastiques - Matières premières des polyuréthannes - Détermination de la teneur en

isocyanate (ISO 14896:2009)
Ta slovenski standard je istoveten z: EN ISO 14896:2009
ICS:
83.080.10 Duromeri Thermosetting materials
SIST EN ISO 14896:2009 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 14896:2009
---------------------- Page: 2 ----------------------
SIST EN ISO 14896:2009
EUROPEAN STANDARD
EN ISO 14896
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2009
ICS 83.080.10 Supersedes EN ISO 14896:2001
English Version
Plastics - Polyurethane raw materials - Determination of
isocyanate content (ISO 14896:2009)

Plastiques - Matières premières des polyuréthannes - Kunststoffe - Polyurethanrohstoffe - Bestimmung des

Détermination de la teneur en isocyanate (ISO 14896:2009) Isocyanatanteils (ISO 14896:2008)

This European Standard was approved by CEN on 19 January 2009.

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 CEN Management Centre 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 CEN Management Centre has the same status as the

official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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: Avenue Marnix 17, B-1000 Brussels

© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14896:2009: E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 14896:2009
EN ISO 14896:2009 (E)
Contents Page

Foreword ..............................................................................................................................................................3

---------------------- Page: 4 ----------------------
SIST EN ISO 14896:2009
EN ISO 14896:2009 (E)
Foreword

This document (EN ISO 14896:2009) 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 NBN.

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 August 2009, and conflicting national standards shall be withdrawn at

the latest by August 2009.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 14896:2001.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, 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 the United Kingdom.
Endorsement notice

The text of ISO 14896:2009 has been approved by CEN as a EN ISO 14896:2009 without any modification.

---------------------- Page: 5 ----------------------
SIST EN ISO 14896:2009
---------------------- Page: 6 ----------------------
SIST EN ISO 14896:2009
INTERNATIONAL ISO
STANDARD 14896
Third edition
2009-02-15
Plastics — Polyurethane raw materials —
Determination of isocyanate content
Plastiques — Matières premières des polyuréthannes — Détermination
de la teneur en isocyanate
Reference number
ISO 14896:2009(E)
ISO 2009
---------------------- Page: 7 ----------------------
SIST EN ISO 14896:2009
ISO 14896:2009(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.

COPYRIGHT PROTECTED DOCUMENT
© ISO 2009

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 copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2009 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 14896:2009
ISO 14896:2009(E)
Contents Page

Foreword............................................................................................................................................................ iv

1 Scope ..................................................................................................................................................... 1

2 Normative references ........................................................................................................................... 1

3 Terms and definitions........................................................................................................................... 2

4 Principle................................................................................................................................................. 2

4.1 Method A................................................................................................................................................ 2

4.2 Method B................................................................................................................................................ 2

5 Application ............................................................................................................................................ 2

6 Interferences ......................................................................................................................................... 2

7 Sampling................................................................................................................................................ 3

8 Test conditions ..................................................................................................................................... 3

9 Reagents................................................................................................................................................ 3

10 Apparatus .............................................................................................................................................. 4

11 Method A — Toluene/dibutylamine with aqueous HCI ..................................................................... 4

11.1 Procedure .............................................................................................................................................. 4

11.2 Expression of results ........................................................................................................................... 5

11.3 Precision and bias ................................................................................................................................ 6

11.4 Test report ............................................................................................................................................. 6

12 Method B — Toluene/TCB/DBA with methanolic HCI ....................................................................... 7

12.1 Procedure .............................................................................................................................................. 7

12.2 Expression of results ........................................................................................................................... 8

12.3 Precision and bias ............................................................................................................................... 8

12.4 Test report ............................................................................................................................................. 9

© ISO 2009 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 14896:2009
ISO 14896:2009(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 14896 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 12, Thermosetting

materials.

This third edition cancels and replaces the second edition (ISO 14896:2006), of which it constitutes a minor

revision, the main purpose of which was to combine the standard with its amendment

(ISO 14896:2006/Amd.1:2007), thereby adding a new subclause (12.1.8).
iv © ISO 2009 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 14896:2009
INTERNATIONAL STANDARD ISO 14896:2009(E)
Plastics — Polyurethane raw materials — Determination of
isocyanate content

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 lnternational Standard specifies two methods for the measurement of the isocyanate content of aromatic

isocyanates used as polyurethane raw materials. Method A is primarily applicable to refined toluene

diisocyanate (TDI), methylene-bis-(4-phenylisocyanate) (MDI) and their prepolymers. Method B is applicable

to refined, crude or modified isocyanates derived from toluene diisocyanate, methylene-

bis-(4-phenylisocyanate) and polymethylene polyphenylisocyanate. It can also be used for isomer mixtures of

toluene diisocyanate, methylene-bis-(4-phenylisocyanate) and polymethylene polyphenylisocyanate. Other

aromatic isocyanates may be analysed by this method if precautions are taken to verify suitability. It is not

applicable to blocked isocyanates.
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
ISO 648, Laboratory glassware — Single-volume pipettes
ISO 3696, Water for analytical laboratory use — Specification and test methods

ISO 4787, Laboratory glassware — Volumetric glassware — Methods for use and testing of capacity

ISO 4788, Laboratory glassware — Graduated measuring cylinders
ISO 6353-1, Reagents for chemical analysis — Part 1: General test methods

ISO 6353-2, Reagents for chemical analysis — Part 2: Specifications — First series

ISO 6353-3, Reagents for chemical analysis — Part 3: Specifications — Second series

ISO 14898:1999, Plastics — Aromatic isocyanates for use in the production of polyurethane — Determination

of acidity
© ISO 2009 – All rights reserved 1
---------------------- Page: 11 ----------------------
SIST EN ISO 14896:2009
ISO 14896:2009(E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
polyurethane

polymer prepared by the reaction of an organic di- or polyisocyanate with compounds containing two or more

hydroxyl groups

NOTE Polyurethanes may be thermosetting, thermoplastic, rigid or soft and flexible, cellular or non-cellular.

3.2
assay
percent by mass of a specific isocyanate present in a sample
3.3
isocyanate content
NCO content
percent by mass of the NCO groups present in a sample
3.4
amine equivalent
mass of sample that will combine with 1 gram-equivalent of dibutylamine
4 Principle
4.1 Method A

The isocyanate sample is reacted with an excess of dibutylamine in toluene to form the corresponding

substituted urea. After cooling to room temperature, acetone is added as a co-solvent, then the reaction

mixture is back-titrated with standardized aqueous HCI using potentiometric or colorimetric end point

determination.
4.2 Method B

The isocyanate sample is reacted with an excess of dibutylamine in a toluene/trichlorobenzene solvent to form

the corresponding substituted urea. After cooling to room temperature, the reaction mixture is diluted with

methanol and back-titrated potentiometrically or colorimetrically with methanolic hydrochloric acid. See also

12.1.8.
5 Application

These test methods can be used for research or for quality control purposes to characterize isocyanates used

in polyurethane products.
6 Interferences

Phosgene, the carbamyl chloride of the isocyanate, hydrogen chloride and any other acidic or basic

compounds will interfere. In refined isocyanates, these impurities are usually present in such small amounts

that they do not affect the determination; however, some crude or modified isocyanates may contain acidities

of up to approximately 0,3 %, so the value reported for the NCO content of unrefined isocyanates should

preferably be designated as “corrected” or “uncorrected” for acidity.
2 © ISO 2009 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 14896:2009
ISO 14896:2009(E)
7 Sampling

Since organic isocyanates react with atmospheric moisture, take special precautions in sampling (see

warning). Usual sampling methods (for example, sampling an open drum with a thief), even when conducted

rapidly, can cause contamination of the sample with insoluble ureas; therefore, blanket the sample with a dry

inert gas (e.g. nitrogen, argon or dried air) at all times.

WARNING — Organic isocyanates are hazardous when absorbed through the skin, or when the

vapours are breathed. Provide adequate ventilation and wear protective gloves and eyeglasses.

8 Test conditions

Since isocyanates react with moisture, keep the laboratory humidity low, preferably below 50 % relative

humidity.
9 Reagents
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.