Product means the compound or chemical(s) that are produced or manufactured as the intended output of a process unit. Impurities and wastes are not considered products.
40 CFR § 63.1361
Terms used in this subpart are defined in the CAA, in subpart A of this part, or in this section. If the same term is defined in subpart A of this part and in this section, it shall have the meaning given in this section for the purposes of this subpart MMM.