Definition of "diisocyanate" [diisocyanate]

• Any compound containing two isocyanate anions or functional groups, but especially such an organic compound used in the preparation of polyurethane (noun)

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• "On Friday afternoon, officials issued a new evacuation order because of a new chemical called toulene diisocyanate, which is used in plastic and other chemical manufacturing."
• "That unit, which will make methylene diphenyl diisocyanate (MDI), is scheduled to start up in early 2005."
• "The willful violations are for failing to conduct noise monitoring for employees who were exposed to noise levels at or above a time-weighted average of 120 dBA, to identify and evaluate respiratory hazards associated with methylene diphenyl diisocyanate and to provide a carbon monoxide monitor for employees utilizing compressed air from an oil lubricated compressor as breathing air during blasting operations."