Analysis
HTS 2935.90.33 covers sulfathiazole and Sulfathiazole, sodium under heading 2935 (sulfonamides).
Within this group the rate runs from duty-free to 6.5%. Compared with 2935.90.95 (other: other), which pays 6.5%, a misclassification either way moves the duty by 6.5 percentage points.
The normal trade relations rate here is zero, shared by about 26% of the 1050 tariff lines in chapter 29, a useful check when a neighbouring dutiable line is a candidate. Free here means free of the base duty only: origin-specific Chapter 99 duties such as Section 301 can still be owed.
Census statistics map these goods to NAICS 325412 (Pharmaceutical Preparation Manufacturing), an industry of 1,436 US establishments employing 170,029 people. That concordance is how imports of this line are compared with US output.
Every edition we compared, from Jan 2023 to Oct 2026 (Rev. 22), shows the same general rate of Free.
Neighbouring lines
| Line | Description | General rate |
|---|---|---|
| 2935.90.06 | 4-Amino-6-chloro-m-benzenedisulfonamide and Methyl-4-aminobenzenesulfonylcarbamate (Asulam) | 6.5% |
| 2935.90.10 | 2-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 Metanilamide | 6.5% |
| 2935.90.13 | (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-toluenesulfonamides | Free |
| 2935.90.15 | o-Toluenesulfonamide | 6.5% |
| 2935.90.20 | Fast color bases and fast color salts | 6.5% |
| 2935.90.29 | Acetylsulfaguanidine | Free |
| 2935.90.30 | Anti-infective agents: sulfamethazine | Free |
| 2935.90.32 | Acetylsulfisoxazole; Sulfacetamide, sodium; and Sulfamethazine, sodium | 6.5% |
| 2935.90.42 | Salicylazosulfapyridine (Sulfasalazine); Sulfadiazine; Sulfaguanidine; Sulfamerizine; and Sulfapyridine | Free |
| 2935.90.48 | Anti-infective agents: other | 6.5% |
| 2935.90.60 | Drugs: other | 6.5% |
| 2935.90.75 | Products described in additional U.S. note 3 to section VI | 6.5% |
| 2935.90.95 | Other: other | 6.5% |