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substance
A chemical element or compound, e.g., lead (a chemical element), lead oxide (a compound), polyvinyl chloride (a compound).
NOTE Registry numbers of the Chemical Abstracts System of the American Chemical Society (CAS numbers) have been assigned to all chemical elements and most of their compounds and should be used for their identification. CAS numbers are provided in Annex F of JIG101.
References
JIG101, 5/05User login
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