2932.99.90/1,3,5-Trioxane Crystals/Mexico

1,3,5-Trioxane Crystals from Mexico

1,3,5-Trioxane forms six-membered ring with three oxygen hetero-atoms from formaldehyde cyclization. Used in polymers despite chapter note exclusion reference. HTS 2932.99.90 as defined oxygen heterocycle.

Duty Rate — Mexico → United States

13.7%

Rate breakdown

9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico

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Import Tips

• Acid stabilizer prevents depolymerization during shipping

• Melting point 62°C confirms crystalline form

• Distinguish from paraformaldehyde (Chapter 39)