Volatile Methyl Siloxane

Short version:

• Exposures at the highest vapor concentrations cause uterine tumors in rats.
• They are concerned about the potential non-carcinogenic effects associated with D5 and its apparent persistence in the environment and animal and human tissues.
• It will not pose a risk to the public living near businesses.
• It has not undergone formal evaluation for identification as a Toxic Air Contaminant (TAC).

Full version:

Health and Environmental Impacts
California’s Office of Environmental Health Hazard Assessment (OEHHA) conducted an evaluation of the available D5 information and concluded that exposures of D5 at the highest achievable vapor concentrations cause uterine tumors in rats.

OEHHA is also concerned about the potential non-carcinogenic effects associated with D5 and its apparent persistence in the environment and animal and human tissues. However, available exposure information indicates that the use of D5 as an
alternative dry cleaning solvent will not pose a risk to the public living near businesses using D5. D5 has not undergone formal evaluation for identification as a TAC.

All these solvents adopted by the California OEHHA have been determined to create hazardous waste.