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How Are Diisocyanates Regulated?




Unreacted Diisocyanates in Spray Polyurethane Foam and
Action from California’s Department of Toxic Substances Control (DTSC)

In March 2014, the California Department of Toxic Substances Control (DTSC) listed Spray Polyurethane Foam (SPF) Systems containing “unreacted” or “wet” diisocyanates as a test case for its new Safer Consumer Products Regulation. Diisocyanates are well-studied and regulatory limits exist for MDI, a diisocyanate, used in SPF.


The United States chemical industry is committed to complying with all federal, state and local regulations, and evaluates products before they reach the marketplace for health, safety and environmental compliance. Diisocyanates have been used since the late 1940s and their safety and environmental impact have been well studied. Diisocyanates are highly regulated chemicals under the authority of the U.S. Environmental Protection Agency (EPA), the Occupational Safety and Health Administration (OSHA) and other government agencies. Federal authorities have set exposure safety limits for diisocyanates emissions to protect both workers in production facilities and surrounding communities. The environment, health and safety benchmarks are based on science and reviewed by government officials with the goal of protecting workers and communities. Companies can face significant civil and criminal penalties for noncompliance.

To learn more about chemical safety policies and regulations, including the Toxic Substances Control Act (TSCA), visit the Chemical Safety section of the ACC Website. There you can learn more about chemical safety, including the federal laws that cover the safe use of chemical products. The Consumer SafetyProduct Safety and Workplace Safety sections of the ACC Website also provide useful information.

You may also want to visit the Consumer Safety and DiisocyanatesEnvironmental Stewardship and Frequently Asked Questions sections of this DII Website.

Federal Government Agencies:

A number of federal agencies also provide useful information about many chemicals, including DII. Here are links to some of the federal agencies:



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