Precursor.
Precursor. Means any chemical reactant which takes part, at any stage in the production, by whatever method, of a toxic chemical. The term includes any key component of a binary or multicomponent chemical system.
Source
15 CFR § 710.1
Scoping language
The following are definitions of terms used in the CWCR (parts 710 through 729 of this subchapter, unless otherwise noted):