Tris added to California Prop 65 carcinogen list

According to environmental groups that monitor their meetings, the State of California’s Carcinogen Identification Committee voted last week to add Tris, Tris(1,3-dichloro-2-propyl) phosphate or TDCPP, to the list of “chemicals known to the State of California to cause  cancer and birth defects or other reproductive harm”, commonly known as the Proposition 65 list.

TDCPP is very widely used as a fire retardant in polyurethane foam in car seats and upholstered furniture. The chemical is detected in indoor air and dust, in surface waters, and in human milk and adipose tissue.

The designation of TDCPP to the Prop 65 list is likely to mean that the State of California will require hazard labeling of all products that contain the substance.  Although Prop 65 applies only in California, decisions of the California Carcinogen Identification Committee often have an impact on toxic substance considerations across the continent.

GallonDaily notes that some fire retardant experts are reported to have stated that TDCPP provides little or no benefit when used as a fire retardant in polyurethane foam products.

A summary of the case against TDCPP, prepared by an official of the
Office of Environmental Health Hazard Assessment of the State of California, is at

A press release from one of the environmental groups that have been working on the Tris issue is at

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