scope:

This International Standard specifies a gas-chromatographic method for determining monomeric diisocyanates such as toluene diisocyanate ¹⁾, hexamethylene diisocyanate, isophorone diisocyanate ²⁾, diphenylmethane diisocyanate³⁾ and other diisocyanates in isocyanate resins as defined in Clause 3 and in solutions prepared from such resins, insofar as these are used in the formulation of paints and similar coating materials.

1) The term "toluene diisocyanate" is used here and in the following text for 4-methyl-1,3-phenylene diisocyanate (2,4-toluene diisocyanate) and 2-methyl-1,3-phenylene diisocyanate (2,6-toluene diisocyanate).

2) The term "isophorone diisocyanate" is used here and in the following text for 2-isocyanatomethyl)- 3,5,5-trimethylcyclohexylisocyanate. The stereoisomers are identified at the appropriate points in the text by (I) and (II).

3) The term "diphenylmethane diisocyanate" is used here and in the following text for 4,4-diisocyanatodiphenylmethane, 2,4-diisocyanatodiphenylmethane and 2,2-diisocyanatodiphenylmethane.