These siloxanes are known as octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6). Industry and government-initiated environmental monitoring programs have produced a robust data set that demonstrates that:
- Siloxanes pose negligible or no risk to the environment
- No regulatory restrictions are warranted
Global governments are using real-world data to drive chemical assessments. For example, Environment Canada reviewed the scientific data and environmental monitoring results available for D4 and determined that no restrictions were needed on product use or product concentration limits for D4 in any application. Canada’s Minister of the Environment also ruled that no regulatory restrictions on the siloxane known as D5 need to be imposed after it was found by an independent panel of expert toxicologists to pose no risk to the environment now, nor should it pose any risk in the future. Environment Canada also found that D6 did not meet the criteria for listing as a toxic chemical under the Canadian Environmental Protection Act (CEPA) regulation.
Australia reviewed the scientific data and monitoring results available for D4, D5, and D6. The conclusions reached by their evaluation was in agreement with Canada’s assessment and risk management decisions for these three materials.