U.S. Code of Federal Regulations

Regulations most recently checked for updates: Jan 21, 2026

All TitlesTitle 27Chapter IPart 21Subpart E - Subpart E—Specifications for Denaturants
§ 21.91 - General.
§ 21.92 - Denaturants listed as U.S.P. or N.F.
§ 21.93 - Acetaldehyde.
§ 21.94 - Acetaldol.
§ 21.94-T - Alkylate.
§ 21.95 - Alpha terpineol.
§ 21.96 - Ammonia, aqueous.
§§ 21.97-21.98 - §[Reserved]
§ 21.99 - Brucine alkaloid.
§ 21.100 - n-Butyl alcohol.
§ 21.101 - tert-Butyl alcohol.
§ 21.102 - Caustic soda, liquid.
§§ 21.103-21.104 - §[Reserved]
§ 21.105 - Citronella oil, natural.
§ 21.105-T1 - Cornmint oil (Mentha arvensis and Mentha canadensis).
§ 21.105-T2 - Cyclohexane.
§ 21.106 - Diethyl phthalate.
§ 21.106-T - Distilled lime oil (Citrus aurantifolia).
§ 21.107 - Ethyl acetate.
§ 21.108 - Ethyl ether.
§ 21.108-T - Ethyl tertiary butyl ether.
§ 21.109 - Gasoline.
§ 21.110 - Gasoline, unleaded.
§ 21.111 - [Reserved]
§ 21.112 - Heptane.
§ 21.112-T1 - Hexane (mixed isomers).
§ 21.112-T2 - n-Hexane.
§ 21.112-T3 - High octane denaturant blend.
§ 21.113 - Isopropyl alcohol.
§ 21.114 - Kerosene.
§ 21.115 - Kerosene (deodorized).
§ 21.115-T1 - Lemon oil (Citrus limonium).
§ 21.115-T2 - L(-)-Carvone.
§ 21.116 - Methyl alcohol.
§ 21.117 - Methyl isobutyl ketone.
§ 21.118 - Methyl n-butyl ketone.
§ 21.118-T1 - Methyl tertiary butyl ether.
§ 21.118-T2 - Naphtha.
§ 21.118-T3 - Natural gasoline.
§ 21.119 - Nicotine solution.
§ 21.120 - Nitropropane, mixed isomers of.
§ 21.121 - Peppermint oil, Terpeneless.
§ 21.122 - Potassium Hydroxide.
§ 21.123 - Pyronate.
§ 21.124 - Quassin.
§ 21.124-T - Raffinate.
§ 21.125 - Rubber hydrocarbon solvent.
§ 21.126 - Safrole.
§ 21.127 - Shellac (refined).
§ 21.128 - [Reserved]
§ 21.129 - Spearmint oil, terpeneless.
§ 21.130 - Spike lavender oil, natural.
§ 21.130-T - Straight run gasoline.
§ 21.131 - Sucrose octaacetate.
§ 21.132 - Toluene.
§ 21.133 - Vinegar.
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