Tetramethylguanidine (TMG)
Tetramethylguanidine (TMG) is a strong organic base with a guanidine structure and four methyl groups, classified as a chemically defined imine-function compound under tariff item 2925.29.00. It is used as a catalyst and reagent in organic synthesis, and is not excluded by Chapter 29 notes.
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 a salt of an imine rather than the free base
Salts of imines are classified under the same heading but in the subheading for imine salts, which is numerically earlier.
If the guanidine structure is part of a nitrogen-containing heterocyclic ring
Cyclic compounds with nitrogen heteroatoms fall under heading 29.33, which is more specific than acyclic imines.
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
• Classify TMG under 2925.29.00 as an imine derivative and provide the CAS number (80-70-6) on the commercial invoice
• Verify that the product is not diluted with solvents beyond what is needed for safe transport, as per Chapter 29 note 1(e)
• Consult the CBSA tariff classification advice service if unsure about purity levels
Related Products under Tariff item 2925.29.00
1,3-Di-o-tolylguanidine
1,3-Di-o-tolylguanidine is an aromatic guanidine derivative used as a rubber accelerator and curing agent in industrial applications. It is classified under tariff item 2925.29.00 as an 'Other' imine-function compound, specifically a guanidine derivative.
2-(Benzylideneamino)phenol
2-(Benzylideneamino)phenol is an aromatic imine derivative of o-aminophenol used in chelating agent synthesis and as an analytical reagent. It is a separate chemically defined organic compound, classified under tariff item 2925.29.00.
3-Dimethylaminomethyleneiminophenol Hydrochloride
3-Dimethylaminomethyleneiminophenol hydrochloride is a hydrochloride salt of an aromatic imine derivative used in organic synthesis and as an intermediate for dyes and pharmaceuticals. It falls under tariff item 2925.29.00 as an 'Other' imine derivative.
4,4'-Methylenebis(N,N-dimethylaniline) Iminium Salt
4,4'-Methylenebis(N,N-dimethylaniline) Iminium Salt is an aromatic iminium salt used as an intermediate in dye manufacturing and photographic chemicals. It is a separate chemically defined organic compound, classified under tariff item 2925.29.00.
4-Nitrobenzylideneaniline
4-Nitrobenzylideneaniline is a nitro-substituted Schiff base imine with an electron-withdrawing group, classified under tariff item 2925.29.00 as an imine derivative. It is used in explosive detection and organic electronics, and is not excluded by Chapter 29 notes on halogenated derivatives.
99% Pure Tetramethylguanidine
99% Pure Tetramethylguanidine is a high-purity organic base used in pharmaceutical intermediate synthesis. It is a separate chemically defined imine derivative, classified under tariff item 2925.29.00.