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The Department of Toxic Substances Control (DTSC) held a public comment period, which ended June 6, 2017, for a rulemaking to add Spray Polyurethane Foam (SPF) Systems with Unreacted Methylene Diphenyl Diisocyanates (MDI) as a Priority Product to the Priority Product List in regulation 69511, Article 11, Chapter 55, Division 4.5 of Title 22, CCR, due to potential worker and consumer exposure. SPF systems are typically used for insulation and roofing in order to increase a building's energy efficiency, but the use of SPF containing unreacted MDI are associated with adverse health effects. Priority Product listing for MDI will require manufacturers to identify if the chemical is necessary and if there are any safer alternatives.

For more information regarding the Priority Product rulemaking program updates, please visit the DTSC-CalSAFER website or Trinity's Bakersfield office at (661) 282-2200.