Tetrahydrofuran (THF) ACS Grade
Tetrahydrofuran (THF) is a five-membered heterocyclic ring containing one oxygen hetero-atom, used as solvent in Grignard reactions. HTS 2932.99.90 covers this as other oxygen heterocyclic not specified elsewhere. ACS grade ensures high purity meeting chemically defined compound criteria.
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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 furan derivative with specific substitution
Certain substituted furans have earlier subheadings in 2932 per numerical order precedence.
If acyclic ether impurity predominates
Must be predominantly heterocyclic; significant acyclic impurities shift to Chapter 29 acyclic ethers.
If for use as paint stripper solvent
Specific use solvents formulated for industry fall in 3814 rather than general chemicals.
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Import Tips & Compliance
• ACS certification mandatory; provides analytical data confirming >99.9% purity for Chapter 29 classification
• Peroxide inhibitor (BHT) must be declared as stabilizer only; excess levels trigger note (g) exclusion
Related Products under HTS 2932.99.90
Trioxane Pharmaceutical Intermediate
Trioxane is a heterocyclic compound with oxygen hetero-atoms forming a six-membered ring, used as an intermediate in pharmaceutical synthesis. It falls under HTS 2932.99.90 as a heterocyclic compound with oxygen hetero-atoms only, not elsewhere specified in heading 2932. This classification applies to pure chemical forms without additional functional groups that would shift it to other subheadings.
Morpholine Industrial Grade
Morpholine is a six-membered heterocyclic ring with one oxygen and one nitrogen hetero-atom, but classified here due to oxygen hetero-atom specification. Used in rubber curing and corrosion inhibitors. HTS 2932.99.90 as other oxygen-containing heterocycles.
Crown Ether 18-Crown-6
18-Crown-6 is a macrocyclic polyether with six oxygen hetero-atoms in 18-membered ring, used for phase transfer catalysis. HTS 2932.99.90 covers as other oxygen heterocyclic compounds. Excluded from acyclic ethers of heading 2909.
Epichlorohydrin (Pure)
Epichlorohydrin is a three-membered epoxide ring with oxygen hetero-atom and chloromethyl group, precursor for epoxy resins. Despite epoxide note exclusion, classified 2932.99.90 as halogenated oxygen heterocycle. Chapter notes distinguish from simple epoxides.
Diglyme (Diethylene Glycol Dimethyl Ether)
Diglyme is a heterocyclic diether with oxygen hetero-atoms in flexible ring conformation, used in organometallic chemistry. HTS 2932.99.90 as other oxygen heterocycles distinguished from acyclic ethers.
2-Methyltetrahydrofuran
2-Methyltetrahydrofuran (2-MeTHF) is a five-membered oxygen heterocyclic ring with methyl substitution, bio-based solvent alternative to THF. Classified HTS 2932.99.90 as substituted oxygen heterocycle.