Polyurethanes are produced by reacting diisocyanates with polyols. Other chemicals, such as catalysts, surfactants or flame retardants, may be included in the process. Atmospheric emissions of the diisocyanates MDI and TDI during isocyanate production or other applications are low, as they are carried out in closed equipment with controls on all vents.
Large quantities of MDI and TDI are routinely transported in a variety of dedicated containers ranging from ships' tanks to plastic drums. In the unlikely event of a spill to the aquatic or soil environments, the MDI or TDI reacts to form inert polyureas. Also, MDI and TDI react with water to form predominantly insoluble inert solid polyureas and release carbon dioxide. Of course, a spill should be addressed appropriately in compliance with U.S. environmental laws and in accordance with the manufacturer’s MSDS.
MDI and TDI present on soil as the result of a spill reacts with moisture in the environment and slowly forms solid polyureas, which can be expected to be essentially unreactive.
Facilities that manufacture, process or otherwise use MDI or PMDI and exceed the threshold limits required by the U.S. Environmental Protection Agency (EPA), are required by EPA to submit a Form A or Form R by July 1st of each year to the EPA and the designated state agency. To aid in the reporting of TRI forms, CPI offers a Regulatory Compliance Assistance Program (RCAP). This program offers some assistance to RCAP software users. For assistance or questions regarding MDI, PMDI or TRI reporting, contact CPI RCAP Software User Support.
MDI Emissions Estimator Software
This software provides a fast and convenient method to estimate MDI emissions from typical process applications and activities.
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