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2917.20.00.00/3,6-Endoxo-1,2,3,6-tetrahydrophthalic anhydride/Canada

3,6-Endoxo-1,2,3,6-tetrahydrophthalic anhydride from Canada

Bicyclic cyclenic anhydride featuring oxygen-bridged norbornene structure with fused phthalic anhydride. Covered by HTS 2917.20.00.00 as cyclenic polycarboxylic acid derivative. Key monomer for high-temperature resistant polymers.

Duty Rate — Canada → United States

14.2%

Rate breakdown

9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
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Import Tips

• Distinguish exo/endo isomers via NMR; both cyclenic but different reactivity profiles

• Provide Diels-Alder reaction synthesis documentation confirming structure

• Monitor double bond content as full hydrogenation changes to hexahydro version

3,6-Endoxo-1,2,3,6-tetrahydrophthalic anhydride from Canada — Import Duty Rate | HTS 2917.20.00.00