1,3,5-Trioxane Crystals from China
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 — China → United States
3.7%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Acid stabilizer prevents depolymerization during shipping
• Melting point 62°C confirms crystalline form
• Distinguish from paraformaldehyde (Chapter 39)