Chapter 35
Albuminoidal Substances; Glues
By TariffCenter Research Team · Updated 2026-04-09 · Source: USITC Harmonized Tariff Schedule
At a glance
Chapter 35 contains 47 HTS lines covering albuminoidal substances; glues. General U.S. duty rates: Free to 6.5%. Section 301 surcharges apply on selected lines for imports from China. Reciprocal tariffs apply following the February 2026 SCOTUS ruling.
3501 — Casein, caseinates and other casein derivatives; casein glues
#Heading 3501 contains 7 HTS lines. General U.S. duty rates: Free–6%. Section 301 surcharges (7.5%–100%) and Section 122 surcharge (15%) apply to selected lines.
3501
Casein, caseinates and other casein derivatives; casein glues:
Free
3501.10
Casein:
Free
3501.10.10.00
Milk protein concentrate
0.37¢/kg
3501.10.50.00
Other
Free
3501.90
Other:
Free
3501.90.20.00
Casein glues
6%
3501.90.60.00
Other
0.37¢/kg
| HS Code | Description | General Rate | Special Rates |
|---|---|---|---|
| 3501 | Casein, caseinates and other casein derivatives; casein glues: | Free | 301: 25%S122: 10% |
| 3501.10 | Casein: | Free | 301: 25%S122: 10% |
| 3501.10.10.00 | Milk protein concentrate | 0.37¢/kg | 301: 25%S122: 10%hts_special: Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) |
| 3501.10.50.00 | Other | Free | 301: 25%S122: 10% |
| 3501.90 | Other: | Free | 301: 25%S122: 10% |
| 3501.90.20.00 | Casein glues | 6% | 301: 25%S122: 10%hts_special: Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) |
| 3501.90.60.00 | Other | 0.37¢/kg | 301: 25%S122: 10%hts_special: Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) |
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
#Heading 3502 contains 5 HTS lines. General U.S. duty rates: Free. Section 301 surcharges (7.5%–100%) and Section 122 surcharge (15%) apply to selected lines.
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:
Free
3502.11.00.00
Dried
47.6¢/kg
3502.19.00.00
Other
9.7¢/kg
3502.20.00.00
Milk albumin, including concentrates of two or more whey proteins
Free
3502.90.00.00
Other
Free
| HS Code | Description | General Rate | Special Rates |
|---|---|---|---|
| 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: | Free | 301: 25%S122: 10% |
| 3502.11.00.00 | Dried | 47.6¢/kg | 301: 25%S122: 10%hts_special: Free (A+,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P, PA,PE,S,SG) |
| 3502.19.00.00 | Other | 9.7¢/kg | 301: 25%S122: 10%hts_special: Free (A+,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P, PA,PE,S,SG) |
| 3502.20.00.00 | Milk albumin, including concentrates of two or more whey proteins | Free | 301: 25%S122: 10% |
| 3502.90.00.00 | Other | Free | 301: 25%S122: 10% |
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
#Heading 3503 contains 8 HTS lines. General U.S. duty rates: Free. Section 301 surcharges (7.5%–100%) and Section 122 surcharge (15%) apply to selected lines.
3503.00
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:
Free
3503.00.10.00
Fish glue
1.2¢/kg + 1.5%
3503.00.20.00
Valued under 88 cents per kg
1.2¢/kg + 3.2%
3503.00.40.00
Valued 88 cents or more per kg
2.8¢/kg + 3.8%
3503.00.55
Other
2.8¢/kg + 3.8%
3503.00.55.10
Edible gelatin
Free
3503.00.55.20
Photographic gelatin
Free
3503.00.55.50
Other
Free
| HS Code | Description | General Rate | Special Rates |
|---|---|---|---|
| 3503.00 | 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: | Free | 301: 25%S122: 10% |
| 3503.00.10.00 | Fish glue | 1.2¢/kg + 1.5% | 301: 25%S122: 10%hts_special: Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) |
| 3503.00.20.00 | Valued under 88 cents per kg | 1.2¢/kg + 3.2% | 301: 25%S122: 10%hts_special: Free (A+,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P, PA,PE,S,SG) |
| 3503.00.40.00 | Valued 88 cents or more per kg | 2.8¢/kg + 3.8% | 301: 25%S122: 10%hts_special: Free (A+,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM, P, PA,PE,S,SG) |
| 3503.00.55 | Other | 2.8¢/kg + 3.8% | 301: 25%S122: 10%hts_special: Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) |
| 3503.00.55.10 | Edible gelatin | Free | 301: 25%S122: 10% |
| 3503.00.55.20 | Photographic gelatin | Free | 301: 25%S122: 10% |
| 3503.00.55.50 | Other | Free | 301: 25%S122: 10% |
3504 — Peptones and their derivatives; other protein substances and their derivatives, not elsewhere specified or included; hide powder, whether or not chromed
#Heading 3504 contains 6 HTS lines. General U.S. duty rates: Free–5%. Section 301 surcharges (7.5%–100%) and Section 122 surcharge (15%) apply to selected lines.
3504.00
Peptones and their derivatives; other protein substances and their derivatives, not elsewhere specified or included; hide powder, whether or not chromed:
Free
3504.00.10.00
Protein isolates
5%
3504.00.50
Other
4%
3504.00.50.10
Certified organic
Free
3504.00.50.50
Other
Free
3504.00.50.80
Other
Free
| HS Code | Description | General Rate | Special Rates |
|---|---|---|---|
| 3504.00 | Peptones and their derivatives; other protein substances and their derivatives, not elsewhere specified or included; hide powder, whether or not chromed: | Free | 301: 25%S122: 10% |
| 3504.00.10.00 | Protein isolates | 5% | 301: 25%S122: 10%hts_special: Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) |
| 3504.00.50 | Other | 4% | 301: 25%S122: 10%hts_special: Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) |
| 3504.00.50.10 | Certified organic | Free | 301: 25%S122: 10% |
| 3504.00.50.50 | Other | Free | 301: 25%S122: 10% |
| 3504.00.50.80 | Other | Free | 301: 25%S122: 10% |
3505 — Dextrins and other modified starches (for example, pregelatinized or esterified starches); glues based on starches, or on dextrins or other modified starches
#Heading 3505 contains 8 HTS lines. General U.S. duty rates: Free. Section 301 surcharges (7.5%–100%) and Section 122 surcharge (15%) apply to selected lines.
3505
Dextrins and other modified starches (for example, pregelatinized or esterified starches); glues based on starches, or on dextrins or other modified starches:
Free
3505.10.00
Dextrins and other modified starches
0.7¢/kg
3505.10.00.15
Derived from potato starch
Free
3505.10.00.20
Other
Free
3505.10.00.40
Derived from corn (maize) starch
Free
3505.10.00.45
Derived from potato starch
Free
3505.10.00.92
Other
Free
3505.20.00.00
Glues
2.1¢/kg + 2.9%
| HS Code | Description | General Rate | Special Rates |
|---|---|---|---|
| 3505 | Dextrins and other modified starches (for example, pregelatinized or esterified starches); glues based on starches, or on dextrins or other modified starches: | Free | 301: 25%S122: 10% |
| 3505.10.00 | Dextrins and other modified starches | 0.7¢/kg | 301: 25%S122: 10%hts_special: Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) |
| 3505.10.00.15 | Derived from potato starch | Free | 301: 25%S122: 10% |
| 3505.10.00.20 | Other | Free | 301: 25%S122: 10% |
| 3505.10.00.40 | Derived from corn (maize) starch | Free | 301: 25%S122: 10% |
| 3505.10.00.45 | Derived from potato starch | Free | 301: 25%S122: 10% |
| 3505.10.00.92 | Other | Free | 301: 25%S122: 10% |
| 3505.20.00.00 | Glues | 2.1¢/kg + 2.9% | 301: 25%S122: 10%hts_special: Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) |
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
#Heading 3506 contains 8 HTS lines. General U.S. duty rates: Free–6.5%. Section 301 surcharges (7.5%–100%) and Section 122 surcharge (15%) apply to selected lines.
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:
Free
3506.10
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:
Free
3506.10.10.00
Animal glue, including casein glue, but not including fish glue
6.5%
3506.10.50.00
Other
2.1%
3506.91
Adhesives based on polymers of headings 3901 to 3913 or on rubber:
Free
3506.91.10.00
Optically 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 panels
Free
3506.91.50.00
Other
2.1%
3506.99.00.00
Other
2.1%
| HS Code | Description | General Rate | Special Rates |
|---|---|---|---|
| 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: | Free | 301: 25%S122: 10% |
| 3506.10 | 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: | Free | 301: 25%S122: 10% |
| 3506.10.10.00 | Animal glue, including casein glue, but not including fish glue | 6.5% | 301: 25%S122: 10%hts_special: Free (A+,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) |
| 3506.10.50.00 | Other | 2.1% | 301: 25%S122: 10%hts_special: Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) |
| 3506.91 | Adhesives based on polymers of headings 3901 to 3913 or on rubber: | Free | 301: 25%S122: 10% |
| 3506.91.10.00 | Optically 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 panels | Free | 301: 25%S122: 10% |
| 3506.91.50.00 | Other | 2.1% | 301: 25%S122: 10%hts_special: Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) |
| 3506.99.00.00 | Other | 2.1% | 301: 25%S122: 10%hts_special: Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) |
3507 — Enzymes; prepared enzymes not elsewhere specified or included
#Heading 3507 contains 5 HTS lines. General U.S. duty rates: Free. Section 301 surcharges (7.5%–100%) and Section 122 surcharge (15%) apply to selected lines.
3507
Enzymes; prepared enzymes not elsewhere specified or included:
Free
3507.10.00.00
Rennet and concentrates thereof
Free
3507.90
Other:
Free
3507.90.20.00
Pencillin G amidase
Free
3507.90.70.00
Other
Free
| HS Code | Description | General Rate | Special Rates |
|---|---|---|---|
| 3507 | Enzymes; prepared enzymes not elsewhere specified or included: | Free | 301: 25%S122: 10% |
| 3507.10.00.00 | Rennet and concentrates thereof | Free | 301: 25%S122: 10% |
| 3507.90 | Other: | Free | 301: 25%S122: 10% |
| 3507.90.20.00 | Pencillin G amidase | Free | 301: 25%S122: 10% |
| 3507.90.70.00 | Other | Free | 301: 25%S122: 10% |
Frequently Asked Questions — Chapter 35
Sources & Methodology
- Base HTS rates: U.S. International Trade Commission — Harmonized Tariff Schedule (2025 edition, Chapter 35). “General rate” shows the min–max range across all 10-digit subheadings.
- Section 301 rates: Office of the U.S. Trade Representative — Section 301 action lists. Flags indicate HTS lines listed on USTR China 301 Lists 1–4B.
- Reciprocal tariffs: Based on the post-SCOTUS Section 122 framework (February 2026). See the TariffCenter Tariff Tracker for current program status.
- Verify before importing: U.S. Customs and Border Protection — Rulings Online or consult a licensed customs broker for binding classification rulings.
Glossary
- General rate (MFN rate)
- The base import duty applied to all World Trade Organization members under Most-Favored-Nation treatment. This is the standard rate shown in the General Rate column.
- Section 301 tariff (301: 7.5%–100%)
- An additional surcharge authorized under Section 301 of the Trade Act of 1974, imposed on selected imports from China. Rates vary by product list and category: Lists 1–3 at 25%, List 4A at 7.5%, with four-year review increases up to 100% on strategic sectors (EVs, semiconductors, solar, medical equipment). Applied on top of the MFN base rate.
- Section 122 surcharge (Sec. 122: 15%)
- A 15% global surcharge on all imports enacted under Section 122 authority after the February 2026 SCOTUS ruling struck down IEEPA-based reciprocal tariffs. USMCA-qualifying goods are exempt. Stacked on top of base and Section 301 rates.
- Section 232 tariff (S232)
- Tariffs on qualifying steel, aluminum, copper, and derivative products imposed under Section 232 of the Trade Expansion Act of 1962 on national security grounds. Rates now vary by product bucket and current Chapter 99 treatment.
- hts_special / Special rates
- Preferential duty rates available to imports from countries with Free Trade Agreements or other special trade programs with the U.S. Country codes: AU (Australia), BH (Bahrain), CA (Canada), CL (Chile), CO (Colombia), IL (Israel), JO (Jordan), KR (South Korea), MA (Morocco), MX (Mexico), OM (Oman), PA (Panama), PE (Peru), SG (Singapore). Free (AU,BH...) means duty-free treatment for those partners.