DOPO Derivative 3,9-Dimethylspiro Phosphonate
This DOPO derivative is precisely 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide, a non-halogenated organo-phosphorus compound used in flame-retardant synthesis. It is classified under tariff item 2931.48.00 as the specific named compound.
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 |
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the product is a different DOPO derivative
Other organo-phosphorus derivatives are classified under this item.
If the product is not the specific compound
Other organo-inorganic compounds fall under this residual item.
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
• Clarify the chemical identity to the CBSA, as DOPO derivatives can vary; this specific compound is the named one
• Provide the chemical structure and CAS number to avoid confusion with other DOPO-based products
• Check if the product is regulated as a flame retardant under Canadian chemical regulations
Related Products under Tariff item 2931.48.00
3,9-Dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide
This is the pure chemical compound 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide, a non-halogenated organo-phosphorus derivative. It is a separate chemically defined organic compound with phosphorus atoms directly linked to carbon, falling under heading 29.31 and specifically under tariff item 2931.48.00.
Antioxidant 552 (3,9-Dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide)
Antioxidant 552 is the commercial grade of 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide, a non-halogenated organo-phosphorus stabilizer used in polymers. Even as a commercial product, it is the same chemically defined compound and is classified under tariff item 2931.48.00.
CAS 65481-32-7 3,9-Dimethylspiro[5.5]undecane Phosphonate Dioxide
This is the pure compound identified by CAS 65481-32-7, which is 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide. It is a non-halogenated organo-phosphorus compound used as a building block for ligands, and it falls under tariff item 2931.48.00.
Spiro Phosphonate Monomer for Polymer Synthesis
This research-grade spiro phosphonate monomer is chemically 3,9-dimethyl-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane 3,9-dioxide, used in copolymer production. It is a non-halogenated organo-phosphorus compound and is classified under tariff item 2931.48.00.