Sulfonamides
19 declarable lines
Heading 2935 covers sulfonamides, a group of organic chemicals in chapter 29 that contain the sulfonamide (SO2NH) function. The heading splits first by specific perfluorooctane sulfonamides in lines 2935.10 through 2935.50, then by named and residual sulfonamides under 2935.90, including fast color bases and salts and pharmaceutical anti-infective agents. Most lines carry a 6.5% general (MFN) rate, while several named drug lines and one named chemical line are Free.
Products in this heading
- Sulfamethazine
- Sulfathiazole
- Sulfasalazine (salicylazosulfapyridine)
- Sulfadiazine
- Asulam (methyl-4-aminobenzenesulfonylcarbamate)
- o-Toluenesulfonamide
- N-Ethyl perfluorooctane sulfonamide
- Fast color bases and fast color salts
How to choose the right subheading
- Confirm the product is a sulfonamide, meaning it carries the sulfonamide function, and is a separate chemically defined organic compound.
- Check whether it is a perfluorooctane sulfonamide: those are named in 2935.10 through 2935.50 and are chosen by exact chemical name.
- Check whether the product is a drug, and if so whether it is an anti-infective agent, which drives the 2935.90.29 through 2935.90.48 lines.
- Check whether it is a fast color base or fast color salt, which falls in 2935.90.20.00.
- If no named line fits, use the residual lines, ending with 2935.90.95.00 for other products.
Often confused with
- Heading 2904Sulfonated derivatives of hydrocarbons such as sulfonated naphthalene
Sulfonated hydrocarbons are classified in 2904, not as sulfonamides.
- Heading 2930Organo-sulfur compounds such as thiols and sulfides that have no sulfonamide group
These are sulfur-function compounds but not sulfonamides.
- Heading 2925Saccharin and its salts
Saccharin is a carboxyimide-function compound, not a sulfonamide.
- Heading 2941Penicillins and other antibiotics
Antibiotics are classified in 2941 even when chemically related.
- Heading 2936Vitamins such as thiamine
Vitamins and provitamins go to 2936.
Frequently asked questions
What is the HTS code for sulfamethazine?
Sulfamethazine as an anti-infective drug is classified under 2935.90.30.00. The general (MFN) rate for that line is Free.
What is the duty on o-toluenesulfonamide?
o-Toluenesulfonamide is classified under 2935.90.15.00. The general (MFN) rate for that line is 6.5%.
How do I classify a perfluorooctane sulfonamide?
Match the exact chemical name to the named lines 2935.10.00.00 through 2935.40.00.00, each at a general (MFN) rate of 6.5%. Perfluorooctane sulfonamides not named in those lines go under 2935.50.00.00, also at 6.5%.
Guide written from the official schedule text. Rates quoted are general (MFN) rates; check the line page for trade agreement rates and the classification of your exact product.
All lines in heading 2935
- 2935.10.00.00N-Methyl perfluorooctane sulfonamide6.5%
- 2935.20.00.00N-Ethyl perfluorooctane sulfonamide6.5%
- 2935.30.00.00N-Ethyl -N-(2-hydroxyethyl)perfluorooctane sulfonamide6.5%
- 2935.40.00.00N-(2-hydroxyethyl)-N-methyl perfluorooctane sulfonamide6.5%
- 2935.50.00.00Sulfonamides / Other perfluorooctane sulfonamides6.5%
- 2935.90.06.004-Amino-6-chloro-m-benzenedisulfonamide and Methyl-4-aminobenzenesulfonylcarbamate (Asulam)6.5%
- 2935.90.10.002-Amino-N-ethylbenzenesulfonanilide; 5-Amino-α,α,α-trifluorotoluene-2,4-disulfonamide; Benzenesulfonamide; Benzenesulfonyl hydrazide; 2-Chloro-4-amino-5-hydroxybenzenesulfonamide; 2,5-Dimethoxysulfanilanilide; and Metanilamide6.5%
- 2935.90.13.00(5‐[2‐Chloro‐4‐ (trifluoromethyl)phenoxy]‐N‐ (methylsulfonyl)‐2‐nitrobenzamide) (Fomesafen); N‐(2,6‐Dichloro‐3‐ methylphenyl)‐5‐ amino‐1,3,4‐triazole‐2‐sulfonamide; 2,4‐Dichloro‐5‐ sulfamoylbenzoic acid; N‐Ethyl‐o‐ toluenesulfonamide; N‐Ethyl‐p‐toluenesulfonamide; 7-(Hexadecylsulfonylamino) ‐1H‐indole; Methyl 5‐{[(4,6‐dimethoxy‐2‐pyrimidinyl)amino]‐ carbonylaminosulfonyl} ‐3‐chloro‐1‐methyl‐1H‐pyrazole‐4‐carboxylate (Halosulfuron methyl); and Mixtures of ortho‐ and para-toluenesulfonamidesFree
- 2935.90.15.00Sulfonamides / o-Toluenesulfonamide6.5%
- 2935.90.20.00Fast color bases and fast color salts6.5%
- 2935.90.29.00Sulfonamides / Drugs / Anti-infective agents / AcetylsulfaguanidineFree
- 2935.90.30.00Sulfonamides / Drugs / Anti-infective agents / SulfamethazineFree
- 2935.90.32.00Acetylsulfisoxazole; Sulfacetamide, sodium; and Sulfamethazine, sodium6.5%
- 2935.90.33.00Sulfathiazole and Sulfathiazole, sodiumFree
- 2935.90.42.00Salicylazosulfapyridine (Sulfasalazine); Sulfadiazine; Sulfaguanidine; Sulfamerizine; and SulfapyridineFree
- 2935.90.48.00Sulfonamides / Drugs / Anti-infective agents / Other6.5%
- 2935.90.60.00Sulfonamides / Drugs / Other6.5%
- 2935.90.75.00Products described in additional U.S. note 3 to section VI6.5%
- 2935.90.95.00Sulfonamides / Other6.5%