2621.90.00.00
Other
Classification path
- Other slag and ash, including seaweed ash (kelp); ash and residues from the incineration of municipal waste
- Other
Rates of duty
- General (MFN)
- Free
- Column 2Cuba, North Korea, Russia, Belarus
- Free
- Unit of quantity
- t
Related lines in heading 2621
About heading 2621
Other slag and ash, including seaweed ash (kelp); ash and residues from the incineration of municipal waste
Heading 2621 covers other slag and ash, including seaweed ash (kelp), and ash and residues from the incineration of municipal waste. It has two declarable lines: 2621.10.00.00 for municipal waste incineration ash and residues, and 2621.90.00.00 for other slag and ash, including seaweed ash. Both lines carry a general (MFN) rate of Free.
Full guide to heading 2621Products in this heading
- Municipal waste incinerator ash
- Municipal waste incinerator bottom ash
- Municipal waste incinerator fly ash
- Residues from municipal waste incineration
- Seaweed ash (kelp ash)
- Kelp ash used as a mineral or fertilizer ingredient
- Other slag and ash not covered by earlier headings
Frequently asked questions
What is the HTS code for municipal waste incinerator ash?
Ash and residues from the incineration of municipal waste are classified under 2621.10.00.00. The general (MFN) rate for that line is Free.
What is the duty on seaweed ash (kelp ash)?
Seaweed ash (kelp ash) is classified under 2621.90.00.00. The general (MFN) rate for that line is Free.
How do I classify other slag and ash that is not from municipal waste incineration?
Use 2621.90.00.00 for other slag and ash, including seaweed ash, when no more specific heading applies. The general (MFN) rate for that line is Free.
Source: USITC Harmonized Tariff Schedule, retrieved October 21, 2026.