Consultation document on Octamethylcyclotetrasiloxane(D4): chapter 1

1. Introduction

1.1 Purpose and Scope of the Consultation

The substance Octamethylcyclotetrasiloxane, Chemical Abstract Service Registry Number (CAS RN) 556-67-2, referred to throughout this document as “D4”, was included in Batch2 of the Challenge initiative under the Chemicals Management Plan.

The final screening assessment report concluded that D4 is 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 is 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.  Therefore, it was concluded that D4 met the criteria in paragraph 64 (a) of the Canadian Environmental Protection Act, 1999 (CEPA 1999). The Proposed Order to add D4 to Schedule 1 of CEPA 1999 was published on May 16, 2009.

The proposed environmental objective for D4 is to prevent or minimize releases of D4 to the aquatic environment (EC & HC 2009).  In order to achieve the lowest level of release of D4 to water that is technically and economically feasible, the Government of Canada is considering:

The consultation paper aims to:

Interested stakeholders may include non-government organizations, provincial, territorial and federal government departments, and various companies.

More specifically, for the proposed measures on products, stakeholders include manufacturers, importers and retailers in the cosmetic and toiletry industry.

For the proposed measure on industrial effluents, stakeholders include manufacturers and formulators of soap and cleaning compounds, cosmetic and toiletry, pharmaceutical and medicine products, paints, coatings and adhesives, plastic and rubber products, and chemical manufacturers and distributers.

1.2 Objectives

The main objective of this consultation is to invite stakeholders to provide their comments and feedback on the proposed risk management instruments for D4.  

The specific objectives are to:  

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