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TSCA Chemical Substance Inventory

List of Active Substances Exempt from the TSCA Inventory Notifications (Active-Inactive) Rule

The Toxic Substance Control Act (TSCA), as amended by the Frank R. Lautenberg Chemical Safety for the 21st Century Act, requires EPA to designate certain substances reported under 40 CFR 711 as active substances for the purposes of TSCA section 6(b) prioritization for risk evaluations. The Agency has developed a list of active chemical substances that are exempt from reporting under the TSCA Inventory Notifications (Active-Inactive) rule. The Exemption List of Active Substances includes chemical substances reported under the 2012 and 2016 Chemical Data Reporting (CDR) rule, and in Notices of Commencement received since June 21, 2006. With respect to confidential information, persons who manufactured or processed a chemical substance on the confidential portion of the Inventory that was added to the Inventory prior to June 22, 2016 must submit a request to EPA if they wish to maintain an existing claim for protection against disclosure of the specific chemical identity of the substance as confidential.  

Learn more about the TSCA Inventory Notifications (Active-Inactive) rule.

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Download the Exemption List of Active Substances

A Microsoft Excel version and a generic comma-delimited "CSV" text version of the Exemption List of Active Substances is available for users to download. If you don't have Microsoft Excel, you can use the CSV file. 

Both the Microsoft Excel file, titled Exempt_012018.xlsx, and the CSV version, titled Exempt_012018.csv, contain the following chemical substances that were reported under the 2012 and 2016 CDR, and in Notices of Commencement received since June 21, 2006:

  • Non-confidential chemical substances, as identified by Chemical Abstract Service (CAS) Registry Number and Chemical Abstracts (CA) Index Name; and
  • Non-confidential data for confidential chemical substances, as identified by EPA accession number and generic chemical name.

​For all files, users may need to adjust formatting, including column widths.

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Learn how the data is formatted to help you search 

You can perform basic searches or sort the information contained in both the Microsoft Excel and CSV versions of the Exemption List of Active Substances in different ways.

  • Use a basic "find" search function and type in a part of a chemical name or CAS Registry Number.
  • You may be able to do different or more complex searches or sorts -- see your own software help system or your local computer support personnel for additional instructions.

The following data fields are provided for each chemical substance:

Field
ID
Data Data Must Be Present? Multiple Values Possible?
ACCNO EPA Accession Number N N
CASRN Chemical Abstracts Service (CAS) Registry Number N N
ChemName or GN Preferred Chemical Abstract (CA) Index Name or Generic Name * Y N
CS Commercial Status Designation** Y N
PMNNO PMN Number/Form Number N N
*      These data can be greater than 256 characters in length.
**    Chemical substances reported for the 2012 and 2016 Chemical Data Reporting cycles, and in Notices of Commencement received since June 21, 2006, are marked “active.” 

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