NF EN ISO 14896

NF EN ISO 14896

May 2009
Standard Current

Plastics - Polyurethane raw materials - Determination of isocyanate content

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.

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Main informations

Collections

National standards and national normative documents

Publication date

May 2009

Number of pages

16 p.

Reference

NF EN ISO 14896

ICS Codes

83.080.10   Thermosetting materials

Classification index

T52-130

Print number

1 - 20/04/2009

International kinship

European kinship

EN ISO 14896:2009
Sumary
Plastics - Polyurethane raw materials - Determination of isocyanate content

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.

Replaced standards (1)
NF EN ISO 14896
January 2002
Standard Cancelled
Plastics - Polyurethane raw materials - Determination of isocyanate content

<p> La présente Norme internationale prescrit deux méthodes pour la détermination de la teneur en isocyanate des iso-cyanates 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-phé nyl isocyan ate) 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. </p>

Table of contents
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  • Avant-propos
    iv
  • 1 Domaine d'application
    1
  • 2 Références normatives
    1
  • 3 Termes et définitions
    2
  • 4 Principe
    2
  • 4.1 Méthode A
    2
  • 4.2 Méthode B
    2
  • 5 Applicabilité
    2
  • 6 Interférences
    2
  • 7 Échantillonnage
    3
  • 8 Conditions d'essai
    3
  • 9 Réactifs
    3
  • 10 Appareillage
    4
  • 11 Méthode A - Toluène/dibutylamine avec HCI en solution aqueuse
    4
  • 11.1 Mode opératoire
    4
  • 11.2 Expression des résultats
    5
  • 11.3 Fidélité et biais
    6
  • 11.4 Rapport d'essai
    7
  • 12 Méthode B - Toluène/TCB/DBA avec HCI en solution méthanolique
    7
  • 12.1 Mode opératoire
    7
  • 12.2 Expression des résultats
    8
  • 12.3 Fidélité et biais
    9
  • 12.4 Rapport d'essai
    10
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