EN ISO 14896:2009

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
   4.1 Method A
   4.2 Method B
5 Application
6 Interferences
7 Sampling
8 Test conditions
9 Reagents
10 Apparatus
11 Method A - Toluene/dibutylamine with aqueous HCI
   11.1 Procedure
   11.2 Expression of results
   11.3 Precision and bias
   11.4 Test report
12 Method B - Toluene/TCB/DBA with methanolic HCI
   12.1 Procedure
   12.2 Expression of results
   12.3 Precision and bias
   12.4 Test report

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.