Sign in Book a demo

HTS 3913Natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms

Product or HTS code

Rate lines5

Code	Description	General	Special	Column 2	Units	Calculate
3913.10.00.00	3913.10.00.00Alginic acid, its salts and estersGeneral 4.2% · Special Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) · Column 2 25% · kg	4.2%	Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG)	25%	kg
3913.90	3913.90Other
3913.90.10.00	3913.90.10.00Chemical derivatives of natural rubberGeneral Free · Column 2 20% · kg	Free		20%	kg
3913.90.20	3913.90.20Polysaccharides and their derivativesGeneral 5.8% · Special Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) · Column 2 50%	5.8%	Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	50%
3913.90.20.15	3913.90.20.15Xanthan gumGeneral 5.8% · Special Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) · Column 2 50% · kg	5.8%	Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	50%	kg
3913.90.20.90	3913.90.20.90OtherGeneral 5.8% · Special Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) · Column 2 50% · kg	5.8%	Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	50%	kg
3913.90.50.00	3913.90.50.00OtherGeneral 6.5% · Special Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG) · Column 2 2.2¢/kg + 33.5% · kg	6.5%	Free (A*,AU,BH,CL,CO,D,E,IL,JO,K,KR,MA,OM,P,PA,PE,S,SG)	2.2¢/kg + 33.5%	kg

2026 HTS Revision 21 (October 9, 2026)

Duty by country of origin

Rate line	China23.56% of imports	Austria17.16% of imports	Sweden15.21% of imports	Norway5.7% of imports	Japan5.11% of imports	France4.96% of imports	Italy4.15% of imports	United Kingdom3.86% of imports	Denmark2.76% of imports	Switzerland2.37% of imports
3913.10.00.00Alginic acid, its salts and esters	From 16.7%9903.05.31Depends on product facts	10%9903.05.39	10%9903.05.39	16.7%9903.05.60	12.5%9903.05.49	10%9903.05.39	10%9903.05.39	14.2%9903.05.81	10%9903.05.39	12.5%9903.05.74
3913.90.10.00Chemical derivatives of natural rubber	37.5%9903.05.319903.88.02	10%9903.05.39	10%9903.05.39	12.5%9903.05.60	12.5%9903.05.49	10%9903.05.39	10%9903.05.39	10%9903.05.81	10%9903.05.39	12.5%9903.05.74
3913.90.20.15Xanthan gum	From 43.3%9903.05.319903.88.03AD/CVD may apply	10%9903.05.39	10%9903.05.39	18.3%9903.05.60	12.5%9903.05.49	10%9903.05.39	10%9903.05.39	15.8%9903.05.81	10%9903.05.39	12.5%9903.05.74
3913.90.20.90Other	From 43.3%9903.05.319903.88.03AD/CVD may apply	10%9903.05.39	10%9903.05.39	18.3%9903.05.60	12.5%9903.05.49	10%9903.05.39	10%9903.05.39	15.8%9903.05.81	10%9903.05.39	12.5%9903.05.74
3913.90.50.00Other	44%9903.05.319903.88.02	10%9903.05.39	10%9903.05.39	19%9903.05.60	12.5%9903.05.49	10%9903.05.39	10%9903.05.39	16.5%9903.05.81	10%9903.05.39	12.5%9903.05.74

Total duty on a $10,000 ocean shipment entered 2026-10-13, before customs fees. Origins are the leading sources of US imports under this heading in 2025 (US Census Bureau).