Benzenamine, N-phenyl-, Reaction Products with Styrene and 2,4,4-Trimethylpentene
The Benzenamine, N-phenyl-, Reaction Products with Styrene and 2,4,4-Trimethylpentene (BNST) is an antioxidant used as an additive in vehicle engine oil and in some commercial and industrial lubricants. Available information suggests that there may also be a minor use of BNST as an additive in rubber applications for industrial equipment and machinery and in rubber parts used in vehicles. BNST is manufactured and imported in Canada.
On August 1, 2009, the Ministers of the Environment and of Health published, in Part I of the Canada Gazette, their final decision on the screening assessment of BNST. The screening assessment report concluded that BNST may be entering the environment in a quantity or concentration or under conditions that have or may have an immediate or long-term harmful effect on the environment or its biological diversity. Additionally, BNST meets the criteria for persistence and bioaccumulation as set out in the Persistence and Bioaccumulation Regulations. Based on the conclusions of the assessment, a Final Order adding BNST to the List of Toxic Substances in Schedule 1 under the Canadian Environmental Protection Act, 1999 (CEPA 1999) was published in Part II of the Canada Gazette on March 2, 2011.
The Risk Management Approach for BNST, published on August 1, 2009, outlines the proposed risk management actions. Proposed in the Risk Management Approach is the addition of BNST to the Prohibition of Certain Toxic Substances Regulations to prohibit the manufacture, use, sale, offer for sale or import of BNST and products containing it.
The proposed Prohibition of Certain Toxic Substances Regulations, 2012 including controls on BNST was published in the Canada Gazette, Part I on July 23, 2011, for a 75-day comment period.
On January 2, 2013, the Prohibition of Certain Toxic Substances Regulations, 2012 was published in the Canada Gazette, Part II. The Regulations repeal and replace the Prohibition of Certain Toxic Substances Regulations, 2005.
For more information on this substance, please visit the Chemical Substances website.
- Screening Assessment for the Challenge (Benzenamine, N-phenyl-, Reaction Products with Styrene and 2,4,4-Trimethylpentene)
- CEPA 1999 Schedule 1 - List of Toxic Substances - This substance has been added to the List of Toxic Substances
This substance is entering the environment from the following source(s):
Risk Management Strategy
Click on the following link to view strategies and actions recommended to manage risks associated with the substance:
Risk Management Tool(s)
Tool(s) developed to manage risks associated with the substance:
Risk Management Supporting Activities
Activities supporting the development or implementation of the risk management tool(s):
Forms related to the Prohibition of Certain Toxic Substances Regulations, 2012:
- Schedule 3: Information Related to the Use of Certain Toxic Substances in a Laboratory for Analysis, in Scientific Research or as a Laboratory Analytical Standard
- Schedule 4: Information to be Contained in an Application for a Permit
Consultation (past and present) on the substance:
- Summary of Public Comments Received on the Government of Canada’s Draft Screening Assessment Reports and Risk Management Scope Document for BNST
- Consultation Document on the Risk Management Measure for BNST (Consultation Period closed)
- Response to Comments Received on the Consultation Document on the Risk Management Measure for BNST
- Responses to public comments received on the proposed Prohibition of Certain Toxic Substances Regulations, 2012
Chemicals Management Division
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