Tetrahydrofuran (THF)
Tetrahydrofuran is a saturated heterocyclic compound containing a five-membered furan ring with one oxygen hetero-atom, used as a solvent in chemical reactions and polymer manufacturing. It falls under HTS 2932.19.51.00 as a hydrogenated furan ring compound with oxygen hetero-atom only. This classification covers unfused furan ring structures per Chapter 29 notes.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing stabilizers or impurities exceeding 1%
Blends with additives for safety/transport fall under prepared chemical mixtures in Chapter 38, not pure compounds.
If acetal-functionalized derivative
Acetals of furfuryl alcohol classified by oxygen function in heading 2909 rather than ring structure.
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Import Tips & Compliance
• Provide Certificate of Analysis confirming purity >99% and absence of impurities to verify chemical identity under Chapter 29 note (a)
• Ensure proper UN 2924 hazardous material labeling and shipping papers for flammable liquid Class 3
• Avoid misclassification as mixtures; pure THF qualifies, but solvent blends may shift to Chapter 38
Related Products under HTS 2932.19.51.00
Furfural
Furfural is an unsaturated heterocyclic aldehyde derived from agricultural waste, featuring an unfused furan ring with oxygen hetero-atom, used in resins and flavor production. Classified under HTS 2932.19.51.00 as 'other' furan ring compounds per Chapter 29 hierarchy. Meets criteria for separate chemically defined organic compounds.
2-Methylfuran
2-Methylfuran is a simple alkyl-substituted furan ring compound with oxygen hetero-atom only, used as a biofuel component and flavoring agent. Falls under HTS 2932.19.51.00 as an unfused furan ring 'other' compound. Qualifies as chemically defined per Chapter 29 note (a).
Furfuryl Alcohol
Furfuryl alcohol contains an unfused furan ring with a hydroxymethyl substituent and oxygen hetero-atom only, used in foundry resins and polymers. HTS 2932.19.51.00 applies as hydrogenated-capable furan 'other' compound. Excludes alcoholates per Chapter 29 note (D).
2,5-Dimethylfuran
2,5-Dimethylfuran features an unfused furan ring with symmetric methyl substitutions at positions 2 and 5, used in organic synthesis. Classified HTS 2932.19.51.00 as oxygen-only heteroatom furan 'other'. Chemically defined isomer mixture excluded unless acyclic.
2-Furoic Acid
2-Furoic acid contains a carboxylic acid function attached to unfused furan ring with oxygen hetero-atom only, used in pharmaceuticals. HTS 2932.19.51.00 as furan 'other' per numerical classification rule. Acid function subordinate to ring structure.
Tetrahydrofurfuryl Alcohol
Tetrahydrofurfuryl alcohol is the hydrogenated alcohol derivative of furfuryl alcohol with unfused oxygen-heteroatom ring. Used as green solvent in coatings. HTS 2932.19.51.00 covers hydrogenated furan structures meeting Chapter 29 purity criteria.