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Chapter 35

Albuminoidal Substances; Modified Starches; Glues; Enzymes

49 tariff lines · 33 filing-ready 10-digit codes · codes begin with 35

Chapter 35 of the US Harmonized Tariff Schedule covers albuminoidal Substances; Modified Starches; Glues; Enzymes. Every code in this chapter starts with the digits 35. Work down the nested list below: the bold headings are broad categories, and the 10-digit statistical codes underneath them are what you actually declare to US Customs. Duty rates shown are the general (Column 1) rates that apply to most trading partners.

Codes in Chapter 35

3501Casein, caseinates and other casein derivatives; casein glues
HTS codeDescriptionLevelGeneral duty rate
3501.10Casein6-digit heading
3501.10.10.00Milk protein concentrate10-digit statistical code0.37¢/kg
3501.10.50.00Other10-digit statistical codeFree
3501.90Other6-digit heading
3501.90.20.00Casein glues10-digit statistical code6%
3501.90.60.00Other10-digit statistical code0.37¢/kg
3502Albumins (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
HTS codeDescriptionLevelGeneral duty rate
3502.11.00.00Dried10-digit statistical code47.6¢/kg
3502.19.00.00Other10-digit statistical code9.7¢/kg
3502.20.00.00Milk albumin, including concentrates of two or more whey proteins10-digit statistical codeFree
3502.90.00.00Other10-digit statistical codeFree
3503.00Gelatin (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
HTS codeDescriptionLevelGeneral duty rate
3503.00.10.00Fish glue10-digit statistical code1.2¢/kg + 1.5%
3503.00.20.00Valued under 88 cents per kg10-digit statistical code1.2¢/kg + 3.2%
3503.00.40.00Valued 88 cents or more per kg10-digit statistical code2.8¢/kg + 3.8%
3503.00.55Other8-digit subheading2.8¢/kg + 3.8%
3503.00.55.10Edible gelatin10-digit statistical code
3503.00.55.20Photographic gelatin10-digit statistical code
3503.00.55.50Other10-digit statistical code
3504.00Peptones and their derivatives; other protein substances and their derivatives, not elsewhere specified or included; hide powder, whether or not chromed
HTS codeDescriptionLevelGeneral duty rate
3504.00.10.00Protein isolates10-digit statistical code5%
3504.00.50Other8-digit subheading4%
3504.00.50.10Certified organic10-digit statistical code
3504.00.50.50Other10-digit statistical code
3504.00.50.80Other10-digit statistical code
3505Dextrins and other modified starches (for example, pregelatinized or esterified starches); glues based on starches, or on dextrins or other modified starches
HTS codeDescriptionLevelGeneral duty rate
3505.10.00Dextrins and other modified starches8-digit subheading0.7¢/kg
3505.10.00.15Derived from potato starch10-digit statistical code
3505.10.00.20Other10-digit statistical code
3505.10.00.40Derived from corn (maize) starch10-digit statistical code
3505.10.00.45Derived from potato starch10-digit statistical code
3505.10.00.92Other10-digit statistical code
3505.20.00.00Glues10-digit statistical code2.1¢/kg + 2.9%
3506Prepared 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
HTS codeDescriptionLevelGeneral duty rate
3506.10Products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg6-digit heading
3506.10.10.00Animal glue, including casein glue, but not including fish glue10-digit statistical code6.5%
3506.10.50.00Other10-digit statistical code2.1%
3506.91Adhesives based on polymers of headings 3901 to 3913 or on rubber6-digit heading
3506.91.10.00Optically clear free-film adhesives and optically clear curable liquid adhesives of a kind used solely or principally for the manufacture of flat panel displays or touch-sensitive screen panels10-digit statistical codeFree
3506.91.50.00Other10-digit statistical code2.1%
3506.99.00.00Other10-digit statistical code2.1%
3507Enzymes; prepared enzymes not elsewhere specified or included
HTS codeDescriptionLevelGeneral duty rate
3507.10.00.00Rennet and concentrates thereof10-digit statistical codeFree
3507.90Other6-digit heading
3507.90.20.00Pencillin G amidase10-digit statistical codeFree
3507.90.70Other8-digit subheadingFree
3507.90.70.10Enzymes – proteases, amylases, lipases, cellulases, pectinases, oxidases, and catalases10-digit statistical code
3507.90.70.80Other10-digit statistical code

Not sure which line applies?

Classification follows the General Rules of Interpretation: the most specific description wins, and you must use a 10-digit statistical code on the entry. When two lines look equally plausible, a CBP binding ruling is the only way to be certain.

How HTS codes are structuredEstimate duty

Source: USITC Harmonized Tariff Schedule, 2026 Basic Edition, Revision 16. Rate text is reproduced verbatim from the official export; category paths and duty estimates are derived.

Data loaded August 18, 2026.Check this chapter on hts.usitc.govReport an errorHow this data is built