33 CFR 151.47: Allowed Category D NLSs, excluding oil-like

Last reviewed: October 14, 2026

This section lists Category D NLSs, other than Oil-like Category D NLSs, that the Coast Guard allows to be carried. The list includes many chemicals, edible oils, other oils and waxes. Some entries point to another entry with a "see" cross-reference.

What it says

  1. The Coast Guard allows the Category D NLSs on this list, other than Oil-like Category D NLSs, to be carried.

    “The following is a list of Category D NLSs other than Oil-like Category D NLSs that the Coast Guard allows to be carried:”

  2. Ammonium nitrate solution is on the list only at 45% or less.

    “Ammonium nitrate solution (45% or less)”

  3. Ammonium sulfate solution is on the list only at 20% or less.

    “Ammonium sulfate solution (20% or less)”

  4. Citric acid is on the list only at 70% or less.

    “Citric acid (70% or less)”

  5. Glyphosate solution is on the list only when it does not contain surfactant.

    “Glyphosate solution (not containing surfactant)”

  6. Some entries refer the reader to a group entry, such as the Poly(2-8)alkylene glycol monoalkyl(C1-C6) ether entry for diethylene glycol ethyl ether.

    “Diethylene glycol ethyl ether, see Poly(2-8)alkylene glycol monoalkyl(C1-C6) ether”

Common questions

Which Category D NLSs does the Coast Guard allow to be carried?

The Coast Guard allows the Category D NLSs on this section's list, other than Oil-like Category D NLSs, to be carried.

“The following is a list of Category D NLSs other than Oil-like Category D NLSs that the Coast Guard allows to be carried:”

Is citric acid on the Category D NLS list?

Yes, citric acid is listed, with the limit of 70% or less.

“Citric acid (70% or less)”

Is glyphosate solution allowed as a Category D NLS?

It is listed only when it does not contain surfactant.

“Glyphosate solution (not containing surfactant)”

Where is diethylene glycol ethyl ether listed?

Its entry says to see the Poly(2-8)alkylene glycol monoalkyl(C1-C6) ether entry.

“Diethylene glycol ethyl ether, see Poly(2-8)alkylene glycol monoalkyl(C1-C6) ether”

The text of 33 CFR 151.47

Electronic Code of Federal Regulations (eCFR), current as of April 16, 2026 · Read it on eCFR

Category D NLSs other than oil-like Category D NLSs that may be carried under this part

The following is a list of Category D NLSs other than Oil-like Category D NLSs that the Coast Guard allows to be carried:

Acetophenone Acrylonitrile-Styrene copolymer dispersion in Polyether polyol iso- & cyclo-Alkane (C10-C11) Alkenyl(C11 + )amine Alkyl(C8 + )amine, Alkenyl (C12 + ) acid ester mixture Alkyl dithiothiadiazole (C6-C24) Alkyl ester copolymer (C4-C20) Alkyl(C8-C40) phenol sulfide Aluminum sulfate solution Ammonium hydrogen phosphate solution Ammonium nitrate solution (45% or less) Ammonium nitrate, Urea solution (2% or less NH3) Ammonium phosphate, Urea solution Ammonium polyphosphate solution Ammonium sulfate solution (20% or less) Amyl alcohol (iso-, n-, sec-, primary) Animal and Fish oils, n.o.s.

(see also Oil, edible) Animal and Fish acid oils and distillates, n.o.s.

Aryl polyolefin (C11-C50) Brake fluid base mixtures Butylene glycol iso-Butyl formate n-Butyl formate gamma-Butyrolactone Calcium hydroxide slurry Calcium long chain alkyl sulfonate (C11-C50) Calcium long chain alkyl(C11-C40) phenate Calcium long chain alkyl phenate sulfide (C8-C40) Caprolactam solutions Chlorine chloride solution Citric acid (70% or less) Coconut oil fatty acid methyl ester Copper salt of long chain (C17 + ) alkanoic acid Cyclohexanol Decahydronaphthalene Diacetone alcohol Dialkyl(C8-C9) diphenylamines Dialkyl(C7-C13) phthalates Diethylene glycol Diethylene glycol butyl ether acetate, see Poly(2-8) alkylene glycol monoalkyl(C1-C6) ether acetate Diethylene glycol dibutyl ether Diethylene glycol ethyl ether, see Poly(2-8)alkylene glycol monoalkyl(C1-C6) ether Diethylene glycol ethyl ether acetate, see Poly(2-8)alkylene glycol monoalkyl(C1-C6) ether acetate Diethylene glycol methyl ether acetate, see Poly(2-8)alkylene glycol monoalkyl(C1-C6) ether acetate Diethylene glycol phenyl ether Diethylene glycol phthalate Di-(2-ethylhexyl)adipate 1,4-Dihydro-9,10-dihydroxy anthracene, disodium salt solution Diisobutyl ketone Diisodecyl phthalate, see Dialkyl(C7-C13) phthalates Diisononyl adipate Diisononyl phthalate, see Dialkyl(C7-C13) phthalates 2,2-Dimethylpropane-1,3-diol Dinonyl phthalate, see Dialkyl(C7-C13) phthalates Dipropylene

glycol dibenzoate Dipropylene glycol methyl ether, see Poly(2-8)alkylene glycol monoalkyl(C1-C6) ether Ditridecyl phthalate, see Dialkyl(C7-C13) phthalates Diundecyl phthalate, see Dialkyl(C7-C13) phthalates Dodecenylsuccinic acid, dipotassium salt solution Ethoxylated long chain (C16 + ) alkyloxyalkanamine Ethoxy triglycol (crude) 2-Ethyl-2-(hydroxymethyl)propane-1,3-diol, C8-C10 ester Ethyl acetate Ethyl acetoacetate Ethyl butanol Ethylenediaminetetraacetic acid, tetrasodium salt solution Ethylene glycol Ethylene glycol acetate Ethylene glycol dibutyl ether Ethylene glycol methyl butyl ether Ethylene glycol phenyl ether Ethylene glycol phenyl ether, Diethylene glycol phenyl ether mixture 2-Ethylhexanoic acid, see Octanoic acid Ethyl propionate Ferric hydroxyethylethylene diamine triacetic acid, trisodium salt solution Formamide Glycerine (83%), Dioxanedimethanol (17%) mixture Glycerol monooleate Glyoxal solution (40% or less) Glyphosate solution (not containing surfactant) Heptanoic acid Hexamethylenediamine adipate Hexamethylenetetramine solutions Hexanoic acid Hexanol N-(Hydroxyethyl)ethylenediamine triacetic acid, trisodium salt solution Isophorone Lactic acid Latex (ammonia (1% or less) inhibited) Long chain alkaryl sulfonic acid (C16-C60) Magnesium long chain alkaryl sulfonate (C11-C50) Magnesium long chain alkyl phenate sulfide (C8-C20) 3-Methoxybutyl acetate Methyl acetoacetate Methyl alcohol Methyl amyl

ketone Methyl butenol Methyl butyl ketone Methyl isobutyl ketone Methyl tert-butyl ether Methyl butynol Methyl propyl ketone N-Methyl-2-pyrrolidone Myrcene Naphthalene sulfonic acid-formaldehyde copolymer, sodium salt solution Nonanoic acid (all isomers) Nonanoic, Tridecanoic acid mixture Nonyl methacrylate Noxious Liquid Substance, (17) n.o.s.

Octadecenoamide solution Octanoic acid Oil, edible: Babassu Beechnut Castor Cocoa butter Coconut Cod liver Corn Cottonseed Fish Groundnut Hazelnut Nutmeg butter Olive Palm Palm kernel Peanut Poppy Raisin seed Rapeseed Rice bran Safflower Salad Sesame Soya bean Sunflower seed Tucum Vegetable Walnut Oil, misc: Animal, n.o.s.

Coconut oil, esterified Coconut oil, fatty acid methyl ester Lanolin Linseed Neatsfoot Oiticica Palm oil, fatty acid methyl ester Palm oil, methyl ester Perilla Pilchard Soya bean (epoxidized) Sperm Tung Whale Olefin/Alkyl ester copolymer (molecular weight 2000 + ) Oleic acid Palm kernel acid oil, methyl ester Palm stearin Pentaethylenehexamine Pentanoic acid Poly(2-8)alkylene glycol monoalkyl(C1-C6) ether, Including: Diethylene glycol butyl ether Diethylene glycol ethyl ether Diethylene glycol n-hexyl ether Diethylene glycol methyl ether Diethylene glycol n-propyl ether Dipropylene glycol butyl ether Dipropylene glycol methyl ether Polypropylene glycol methyl ether Triethylene glycol butyl ether Triethylene glycol ethyl ether Triethylene glycol methyl ether Tripropylene glycol methyl ether Poly(2-8)alkylene glycol monoalkyl(C1-C6) ether acetate, Including: Diethylene glycol butyl ether acetate Diethylene glycol ethyl ether acetate Diethylene glycol methyl ether acetate Polyalkylene glycols, Polyalkylene glycol monoalkyl ethers mixtures Polypropylene glycol methyl ether, see Poly(2-8)alkylene glycol monoalkyl(C1-C6) ether Polyalkyl(C10-C20) methacrylate Polybutenyl succinimide Polyether (molecular weight 2000 + ) Polyethylene glycol monoalkyl ether Polyolefin amide alkeneamine (C17 + ) Polyolefin amide alkeneamine (C28 + ) Polyolefin amide alkeneamine borate (C28-C250) Polyolefin amide alkeneamine polyol Polyolefin anhydride Polyolefin ester (C28-C250) Polyolefin phenolic amine (C28-C250) Polyole

fin phosphorosulfide, barium derivative Polypropylene glycol n-Propyl acetate Propylene glycol monoalkyl ether, Including: n-Propoxypropanol Propylene glycol n-butyl ether Propylene glycol ethyl ether Propylene glycol methyl ether Propylene glycol ethyl ether, see Propylene glycol monoalkyl ether Propylene glycol methyl ether, see Propylene glycol monoalkyl ether Propylene glycol methyl ether acetate Propylene glycol phenyl ether Sodium acetate solution Sodium benzoate solution Sodium carbonate solution Soybean oil (epoxidized) Sulfohydrocarbon (C3-C88) Sulfonated polyacrylate solution Sulfolane Sulfurized fat (C14-C20) Sulfurized polyolefinamide alkene(C28-C250)amine Tallow Tallow fatty acid Tetrasodium salt of Ethylenediaminetetraacetic acid solution Triethylene glycol butyl ether, see Poly(2-8)alkylene glycol monoalkyl(C1-C6) ether Triethylene glycol ethyl ether, see Poly(2-8)alkylene glycol monoalkyl(C1-C6) ether Triethylene glycol methyl ether, see Poly(2-8)alkylene glycol monoalkyl(C1-C6) ether Triethyl phosphate Trimethylol propane polyethoxylate Tripropylene glycol methyl ether, see Poly(2-8)alkylene glycol monoalkyl(C1-C6) ether Trisodium salt of N-(Hydroxyethyl)-ethylenediamine triacetic acid solution Urea, Ammonium mono- and di-hydrogen phosphate, Potassium chloride solution Urea, Ammonium nitrate solution (2% or less NH 3) Urea, Ammonium phosphate solution Vegetable oils, n.o.s.

(see also Oil, edible) Vegetable acid oils and distillates, n.o.s.

Waxes: Candelilla Carnauba

The plain-English explanation on this page was written with AI from the regulation text above and checked automatically before publishing: every quote appears in the text, every number comes from it, and a second model confirmed each statement adds nothing the text doesn't say. Regulation text current as of April 16, 2026. The regulation text governs. RegKnot is not affiliated with the U.S. Coast Guard.