Pentanes plus,

Pentanes plus, or C5 + , is a mixture of hydrocarbons that is a liquid at ambient temperature and pressure, and consists mostly of pentanes (five carbon chain) and higher carbon number hydrocarbons. Pentanes plus includes, but is not limited to, normal pentane, isopentane, hexanes-plus (natural gasoline), and plant condensate.

Source

40 CFR § 98.6

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Scoping language

All terms used in this part shall have the same meaning given in the Clean Air Act and in this section.

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