Miscellaneous chemical products

The 27 headings of chapter 38

• 3801: Artificial graphite; colloidal or semi-colloidal graphite; preparations based on graphite or other carbon in the form of pastes, blocks, plates or other semimanufactures (7 codes, General duty Free to 4.9%)
• 3802: Activated carbon; activated natural mineral products; animal black, including spent animal black (6 codes, General duty 2.5% to 5.8%)
• 3803: Tall oil, whether or not refined (1 code, General duty Free)
• 3804: Residual lyes from the manufacture of wood pulp, whether or not concentrated, desugared or chemically treated, including lignin sulfonates, but excluding tall oil of heading 3803 (2 codes, General duty Free to 3.7%)
• 3805: Gum, wood or sulfate turpentine and other terpenic oils produced by the distillation or other treatment of coniferous woods; crude dipentene; sulfite turpentine and other crude para-cymene; pine oil containing alpha-terpineol as the main constituent (3 codes, General duty Free to 5%)
• 3806: Rosin and resin acids, and derivatives thereof; rosin spirit and rosin oils; run gums (5 codes, General duty 3.7% to 6.5%)
• 3807: Wood tar; wood tar oils; wood creosote; wood naphtha; vegetable pitch; brewers' pitch and similar preparations based on rosin, resin acids or on vegetable pitch (1 code, General duty 0.1%)
• 3808: Insecticides, rodenticides, fungicides, herbicides, antisprouting products and plant-growth regulators, disinfectants and similar products, put up in forms or packings for retail sale or as preparations or articles (for example, sulfur-treated bands, wicks and candles, and flypapers) (38 codes, General duty Free to 6.5%)
• 3809: Finishing agents, dye carriers to accelerate the dyeing or fixing of dyestuffs and other products and preparations (for example, dressings and mordants), of a kind used in the textile, paper, leather or like industries, not elsewhere specified or included (6 codes, General duty 3% to 6.5%, some per unit)
• 3810: Pickling preparations for metal surfaces; fluxes and other auxiliary preparations for soldering, brazing or welding; soldering, brazing or welding powders and pastes consisting of metal and other materials; preparations of a kind used as cores or coatings for welding electrodes or rods (4 codes, General duty Free to 6.5%)
• 3811: Antiknock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive preparations and other prepared additives, for mineral oils (including gasoline) or for other liquids used for the same purposes as mineral oils (6 codes, General duty Free to 6.5%)
• 3812: Prepared rubber accelerators; compound plasticizers for rubber or plastics, not elsewhere specified or included; antioxidizing preparations and other compound stabilizers for rubber or plastics (10 codes, General duty Free to 6.5%)
• 3813: Preparations and charges for fire extinguishers; charged fire-extinguishing grenades (2 codes, General duty Free to 3.7%)
• 3814: Organic composite solvents and thinners, not elsewhere specified or included; prepared paint or varnish removers (4 codes, General duty 6% to 6.5%)
• 3815: Reaction initiators, reaction accelerators and catalytic preparations, not elsewhere specified or included (8 codes, General duty Free to 6.5%)
• 3816: Refractory cements, mortars, concretes and similar compositions, including dolomite ramming mix, other than products of heading 3801 (3 codes, General duty Free to 3%)
• 3817: Mixed alkylbenzenes and mixed alkylnaphthalenes, other than those of heading 2707 or 2902 (3 codes, General duty 6.5%)
• 3818: Chemical elements doped for use in electronics, in the form of discs, wafers or similar forms; chemical compounds doped for use in electronics (7 codes, General duty Free)
• 3819: Hydraulic brake fluids and other prepared liquids for hydraulic transmission, not containing or containing less than 70 percent by weight of petroleum oils or oils obtained from bituminous minerals (2 codes, General duty 6.5%)
• 3820: Antifreezing preparations and prepared deicing fluids (1 code, General duty 6.5%)
• 3821: Prepared culture media for development or maintenance of micro-organisms (including viruses and the like) or of plant, human or animal cells (2 codes, General duty 5%)
• 3822: Diagnostic or laboratory reagents on a backing, prepared diagnostic or laboratory reagents whether or not on a backing, whether or not put up in the form of kits, other than those of heading 3006; certified reference materials (8 codes, General duty Free)
• 3823: Industrial monocarboxylic fatty acids; acid oils from refining; industrial fatty alcohols (9 codes, General duty 2% to 5.1%, some per unit)
• 3824: Prepared binders for foundry molds or cores; chemical products and preparations of the chemical or allied industries (including those consisting of mixtures of natural products), not elsewhere specified or included (48 codes, General duty Free to 6.5%)
• 3825: Residual products of the chemical or allied industries, not elsewhere specified or included; municipal waste; sewage sludge; other wastes specified in note 6 to this chapter (9 codes, General duty Free)
• 3826: Biodiesel and mixtures thereof, not containing or containing less than 70 percent by weight of petroleum oils or oils obtained from bituminous materials (2 codes, General duty 4.6% to 6.5%)
• 3827: Mixtures containing halogenated derivatives of methane, ethane or propane, not elsewhere specified or included (20 codes, General duty 3.7% to 6.5%)

Where it sits in the schedule

Chapter 38 is in Section VI of the Harmonized System, chemical products (chapters 28 to 38). Rates are those printed in the 2026 HTS Revision 23; Chapter 99 duties (Section 232, Section 301, IEEPA) are charged on top and are not included.