Carbonyl Sulfide
Carbonyl sulfide (COS) is a colorless, poisonous gas used as a pesticide fumigant and chemical intermediate. It is classified under tariff item 2811.19.00 as an 'other inorganic oxygen compound of non-metals' because Chapter 28 Note 2 specifically lists carbon oxysulphide as classifiable in this chapter.
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 the product is formulated as a pesticide preparation for retail sale
Insecticides put up in measured doses or for retail sale are classified in Chapter 38, not Chapter 28.
If the product is carbon disulphide rather than carbonyl sulfide
Carbon disulphide is specifically classified in heading 28.13.
If the product is a thiocarbonyl halide rather than carbonyl sulfide
Thiocarbonyl halides are listed in Chapter 28 Note 2(e) under heading 28.53.
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
• Carbonyl sulfide is a regulated pesticide in Canada; you must have a Pest Control Products Act registration number or an appropriate exemption before importation
• The CBSA will require the product to be identified as carbon oxysulphide, which is specifically mentioned in Chapter 28 Note 2(e)
• Ensure proper dangerous goods documentation, as COS is flammable and toxic (UN 2204)
Related Products under Tariff item 2811.19.00
33% Hydrobromic Acid in Acetic Acid
A 33% hydrobromic acid solution in glacial acetic acid is a chemically defined inorganic acid, but the solvent is not water. Under Chapter Note 1(c), it qualifies if the acetic acid is a normal and necessary method of putting up for safety or transport and does not render the product suitable for specific use.
48% Hydrobromic Acid Solution
A 48% aqueous solution of hydrogen bromide gas (HBr) is a chemically defined inorganic acid in water. It is classified under this tariff item as an other inorganic acid of a non-metal, per Chapter Note 1(b).
Anhydrous Hydrobromic Acid Gas Cylinder
Anhydrous HBr gas in steel cylinders is a chemically defined inorganic acid in gaseous form. It is classified under this tariff item as an other inorganic acid of a non-metal, as it is not excluded by Chapter Notes.
Anhydrous Sulfamic Acid Flakes
Anhydrous sulfamic acid flakes are a dry, crystalline form of sulfamic acid (H3NSO4) used for analytical chemistry and laboratory reagent applications. It is classified under tariff item 2811.19.00 as an 'other inorganic acid' because it is a separate chemically defined compound of sulfur, nitrogen, hydrogen and oxygen.
Antimonic Acid Colloidal
Colloidal antimonic acid (HSbO3·nH2O) used in flame retardants and catalysts. It is an inorganic oxygen compound of a non-metal, chemically defined despite its colloidal form, and classifiable under this tariff item as an 'other inorganic acid'.
Arsenic Acid Anhydride Powder
Anhydrous arsenic acid powder, also known as arsenic pentoxide when dehydrated, is a chemically defined inorganic compound used in electronics etching. It is classified as an inorganic acid of a non-metal under Chapter 28, meeting the criteria of Note 1(a) to Chapter 28.