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
16.2%
Rate breakdown
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Acid stabilizer prevents depolymerization during shipping
• Melting point 62°C confirms crystalline form
• Distinguish from paraformaldehyde (Chapter 39)