2839.90.10.00
Silicates; commercial alkali metal silicates / Of potassium
Classification path
- Silicates; commercial alkali metal silicates
- Other
- Of potassium
Rates of duty
- General (MFN)
- 3.1%
- Column 2Cuba, North Korea, Russia, Belarus
- 25%
- Unit of quantity
- kg
Trade agreement rates
Related lines in heading 2839
About heading 2839
Silicates; commercial alkali metal silicates
Heading 2839 covers silicates and commercial alkali metal silicates. The heading is split first by metal: sodium silicates in 2839.11 and 2839.19, everything else in 2839.90. Sodium silicates are further split between sodium metasilicates and other sodium silicates, while the residual group is split between potassium and other.
Full guide to heading 2839Products in this heading
- Sodium metasilicate, anhydrous or hydrated
- Sodium silicate solution (water glass) used as a binder or detergent builder
- Sodium orthosilicate
- Potassium silicate used in welding electrode coatings
- Commercial alkali metal silicate mixtures sold dry
- Sodium silicate powder for cements and refractories
Frequently asked questions
What is the HTS code for sodium metasilicate?
Sodium metasilicates are classified under 2839.11.00.00, with a general (MFN) rate of 1.1%.
What is the duty on potassium silicate?
Potassium silicates fall under 2839.90.10.00, and the general (MFN) rate is 3.1%.
How do I classify a sodium silicate that is not a metasilicate?
Other sodium silicates go in 2839.19.00.00, which carries a general (MFN) rate of 1.1%. Silicates of metals other than sodium or potassium go in 2839.90.50.00 at a general (MFN) rate of 3.1%.
Source: USITC Harmonized Tariff Schedule, retrieved October 21, 2026.