Albuminoidal substances; modified starches; glues; enzymes

The 7 headings of chapter 35

• 3501: Casein, caseinates and other casein derivatives; casein glues (4 codes, General duty Free to 6%, some per unit)
• 3502: Albumins (including concentrates of two or more whey proteins, containing by weight more than 80 percent whey proteins, calculated on the dry matter), albuminates and other albumin derivatives (4 codes, General duty Free, some per unit)
• 3503: Gelatin (including gelatin in rectangular (including square) sheets, whether or not surfaceworked or colored) and gelatin derivatives; isinglass; other glues of animal origin, excluding casein glues of heading 3501 (6 codes, General duty 1.5% to 3.8%, some per unit)
• 3504: Peptones and their derivatives; other protein substances and their derivatives, not elsewhere specified or included; hide powder, whether or not chromed (4 codes, General duty 4% to 5%)
• 3505: Dextrins and other modified starches (for example, pregelatinized or esterified starches); glues based on starches, or on dextrins or other modified starches (6 codes, General duty Free to 2.9%, some per unit)
• 3506: Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg (5 codes, General duty Free to 6.5%)
• 3507: Enzymes; prepared enzymes not elsewhere specified or included (4 codes, General duty Free)

Where it sits in the schedule

Chapter 35 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.