TCEQ has recently finalised a DSD on 4,4-methylene diphenyl diisocyanate (MDI), 1,6-hexamethylene diisocyanate (HDI) and their isomers. DSDs are used by TCEQ to inform the derivation of inhalation Effect Screening Levels (ESLs), chemical concentrations in the air that are considered safe for the general population (including vulnerable sub-populations) and that also protect against “welfare effects” (e.g. on plants).

Texas Commission on Environmental Quality (2019). Development support document. 4,4-Methylene Diphenyl Diisocyanate (MDI), All Isomers and 1,6-Hexamethylene Diisocyanate (HDI), All Isomers. Final. December 9, 2019.


The above items were taken from the January/February 2020 issue of Toxicology and Regulatory News which is sent automatically to members of bibra.

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