Petroleum coke,

Petroleum coke, also known as petcoke, means a carbonization product of high-boiling hydrocarbon fractions obtained in petroleum processing (heavy residues). Petroleum coke is typically derived from oil refinery coker units or other cracking processes.

Source

40 CFR § 60.41Da

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Scoping language

As used in this subpart, all terms not defined herein shall have the meaning given them in the Act and in subpart A of this part.

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