On 3 March 2023, the German Ordinance on Facilities Handling Substances That Are Hazardous to Water (AwSV) List of published water hazard class (WGK) classifications was updated. The following substances were newly assigned a WGK:

1. Reaction products of 1,3-Diisocyanatomethylbenzene and aliphatic polyalcohols, polyether polyols or polyester polyols (average MW > 3500 g/mol, residual 1,3-Diisocyanatomethylbenzene < 5%)

   WGK 1 (slightly hazardous to water)

2. Reaction products of 5-Isocyanato-1-(isocyanatomethyl)-1,3,3-trimethylcyclohexane and aliphatic polyalcohols, polyether polyols or polyester polyols (average MW > 7000 g/mol, residual 5-Isocyanato-1-(isocyanatomethyl)-1,3,3-trimethylcyclohexane < 5%)

   WGK 1 (slightly hazardous to water)