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This document proposes to amend the U.S. Customs and Border Protection (CBP) regulations regarding the requirement to file a Toxic Substances Control Act (TSCA) certification when importing into the customs territory of the United States chemicals in bulk form or as part of mixtures and articles containing a chemical or mixture. The proposed regulations include an electronic option for filing TSCA certifications, consistent with the Security and Accountability for Every Port Act of 2006. This document also proposes to clarify and add certain definitions and to eliminate the paper-based blanket certification process. The document was prepared in consultation with the Environmental Protection Agency (EPA), the agency with primary responsibility for implementing TSCA.