Frequent Questions

Part II - Sec. A. Chemical ID (Blocks 2.A.1-2.A.4)

A company notices that there are CASRNs for several gas streams listed in the Partially Exempt Petroleum Process Streams listed in §711.6(b)(1) that appear to be molecularly similar to its fractionated products propane, butane and ethane. However, the CASRNs that the company previously used to report these products are not listed as partially exempt. The CASRNs previously used in reporting by the company were: 74-98-6, Propane, C3H8; 106-97-8, Butane, C4C10; and 74-84-0, Ethane, C2H6. The CASRNS of molecularly similar partially exempt petroleum process streams are: 68476-49-3 Hydrocarbons,C2-4, C-3 rich; 68476-42-6 Hydrocarbons, C4-5; and 68606-25-7 Hydrocarbons, C2-4. The company wants to know whether or not these CASRNs would be considered synonyms and if they can use the CASRNs for the partially exempt process streams for their CDR submission.
How does a submitter determine the Chemical Abstracts Service Registry Number (CASRN) for a chemical substance and what if the submitter can’t find it?
If the substance is confidential, can the Accession Number or the Premanufacture Notice (PMN) case number be used instead?
It would be helpful if the Agency provided a cross-reference list of Premanufacture Notice (PMN) numbers.
The foreign manufacturer supplying a U.S. importer has chosen to keep the chemical substance or the component chemical substances in a mixture confidential and therefore an importer does not know the correct chemical identity(ies) of the chemical substance(s) it is reporting. How does the company report?

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