Zinc Sulfide Crystals
Zinc sulfide (ZnS) crystals, a chemically defined inorganic compound, used in optical coatings, phosphors, and semiconductor applications. They are classified under tariff item 2830.90.00 as 'other' sulfides, provided they are not doped for electronics use.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If doped for electronics and cut into discs, wafers or similar forms
Chapter 28 Note 8 excludes such forms, directing them to heading 38.18.
If the crystals are finished optical elements
Chapter 28 Note 3(h) excludes optical elements of heading 90.01.
If the product is a luminophore (phosphor) of a kind used in coatings
Chapter 28 Note 3(d) excludes inorganic luminophores of heading 32.06.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• If the crystals are doped for electronics and cut into discs or wafers, they fall under heading 38.18, not this item
• Confirm the crystals are not optical elements of heading 90.01
• Keep records of the crystal form and any treatments applied
Related Products under Tariff item 2830.90.00
99.99% Pure Luminescent ZnS for OLED Displays
Ultra-pure zinc sulfide powder with a purity of at least 99.99%, designated for use as a luminescent material in OLED display manufacturing. This chemically defined compound of zinc and sulfur falls under tariff item 2830.90.00 as a sulphide other than those specifically enumerated elsewhere in Chapter 28.
Antimony Trisulfide Powder
Antimony trisulfide (Sb2S3) is a red pigment and friction material used in matches and ammunition primers. It qualifies under tariff item 2830.90.00 as an 'Other' chemically defined sulfide, distinct from the cadmium sulfides listed separately.
Bismuth Sulfide Flakes
Bismuth sulfide (Bi2S3) flakes used in thermoelectric materials and pigments. It is an 'Other' sulfide under tariff item 2830.90.00, chemically defined per Chapter 28 notes.
Cadmium Sulfide for Glass Coloring
Cadmium sulfide specifically for producing stable yellow colors in glass tableware and decorative bottles. This chemically defined sulphide is classifiable under tariff item 2830.90.00 as an other sulphide, as it is not a finished pigment preparation.
Cadmium Sulfide Luminescent Grade
Specially prepared cadmium sulfide activated for phosphorescence in glow-in-the-dark paints and safety markings. While activated, it may still be classifiable under tariff item 2830.90.00 if the activation does not render it a prepared luminophore of heading 32.06.
Cadmium Sulfide Pigment Grade
Cadmium sulfide in pigment-grade form, offering excellent lightfastness and opacity for high-end artists' oil paints and automotive coatings. This chemically defined inorganic sulfide of cadmium falls under tariff item 2830.90.00 as 'Other' sulphides, distinct from more specialized forms.