Consultation on the Proposed Risk Management Measures for Siloxanes D4 and D5


Closed Consultation

Date: August 2010
Place: Toronto, ON

The RCEN selected five (5) delegates to take part in an Environment Canada (EC) consultation to discuss the proposed risk management measures for D4 and D5. The intent of this consultation was to encourage discussion and to give interested and affected parties an opportunity to provide input into the D4 and D5 proposed management measures. The consultation focused on environmental and economic issues associated with the proposed management measures.

Please note that three (3) additional delegates have been selected to participate, should the EC budget be able to accommodate them.

Selected ENGO Delegates:

Additional ENGO Delegates:

Read the Report: ENGO Consolidated Report on Proposed Risk Management Measures for Octamethylcyclotetrasiloxane (D4)

The consultation took place in Toronto, ON, with the following representation:

  • NGOs with experience in assessing and managing toxic substances, such as D4 and D5
  • Industry and/or associations involved in the manufacture, import or use of D4 or D5 in miscellaneous industry sectors (Silicon manufacturers, personal care products formulators, etc.)
  • Other interested stakeholders
  • Federal, Provincial and Territory Governments

The consultation aimed to inform interested stakeholders of the proposed management measures, provide an opportunity for stakeholders to contribute to their development, and ensure that any questions or concerns from interested stakeholders are identified.

Background Information
The final screening assessment reports concluded that D4 and D5 are entering or may be entering the environment in a quantity or a concentration or under conditions that have or may have an immediate or long-term harmful effect on the environment or its biological diversity, but are not entering the environment in a quantity or a concentration or under conditions that constitute or may constitute a danger in Canada to human life or health.

As proposed in the Risk Management Approach for D4 and D5, published in January 2009, the Government of Canada indicated it would consider:

  • Regulations limiting the quantity or concentration of D4 and D5 that may be contained in certain personal care products and, where appropriate, in other consumer products that are manufactured in and imported into Canada, and
  • Regulations establishing maximum D4 and D5 concentrations in final industrial effluent and requiring the implementation of an environmental management system to ensure that best practices are adopted at facilities where D4 and D5 are used.

These proposed measures are intended to achieve the lowest level of release of D4 and D5 to water that is technically and economically feasible.

The proposed measures are expected to affect the following sectors: 

  • soap, cleaning compound and toilet preparation manufacturing;
  • pharmaceutical and medicine manufacturing;
  • paints, coatings and adhesive manufacturing;
  • plastic and rubber product manufacturing;
  • chemical manufacturing and distribution.

Information relevant to this consultation will be sent to RCEN delegates by email 10 days before the meeting.

The final screening assessment reports for these substances and the Proposed Risk Management Approach are available at:

RCEN E-Bulletin


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