BIIR Irregular Lumps
Irregular lumps of brominated isobutene-isoprene rubber (BIIR) obtained directly from polymerization. They are in primary forms as defined in Chapter Note 3(b) and are uncompounded, qualifying as 'other' synthetic rubber under tariff item 4002.39.00.
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 lumps are of styrene-butadiene rubber (SBR) rather than BIIR
SBR is classified under a different subheading within heading 40.02.
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
• Ensure the lumps are uncompounded with no added vulcanizing agents or fillers, as per Chapter Note 5
• Keep shipping documents showing the rubber's origin and polymer type to support classification
• Verify the duty rate with the CBSA tariff lookup before shipment
Related Products under Tariff item 4002.39.00
BIIR Rubber Bale
Brominated isobutene-isoprene rubber (BIIR) compressed into rectangular bales for storage and transport. These bales are primary forms under Chapter Note 3(b) and are uncompounded, falling under tariff item 4002.39.00 as 'other' synthetic rubber.
Butyl Rubber Latex Dispersion
A liquid dispersion of butyl rubber (IIR) in water, used for dipping and coating applications. This latex is a primary form under Chapter Note 3(a) and is uncompounded, qualifying for tariff item 4002.39.00 as 'other' synthetic rubber.
Butyl Rubber Solution Paste
A viscous paste solution of butyl rubber in an organic solvent, used for cement applications. This is a primary form under Chapter Note 3(a) as a solution, and it is uncompounded, falling under tariff item 4002.39.00 as 'other' synthetic rubber.
Butyl VM-6131 Masterbatch Pellets
Butyl VM-6131 masterbatch pellets containing minimal permitted stabilizers for pharmaceutical applications. These pellets are in primary forms under Chapter Note 3(b) and retain their raw material character, qualifying for tariff item 4002.39.00.
Chlorobutyl Rubber Scrap-Free Crumbs
Processed chlorobutyl rubber (CIIR) crumbs from calendaring, usable as a primary input without being waste. These crumbs are in bulk primary forms under Chapter Note 3(b) and are uncompounded, falling under tariff item 4002.39.00.
CIIR Bulk Powder
Bulk chlorobutyl rubber (CIIR) powder for dry blending. This powder is a primary form under Chapter Note 3(b) and is uncompounded, qualifying for tariff item 4002.39.00 as 'other' synthetic rubber.