BS 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

Describes two methods for the measurement of the isocyanate content of aromatic isocyanates used as polyurethane raw materials.

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.