1,3,5-Trioxane Crystals from Canada
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 — Canada → United States
13.7%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Acid stabilizer prevents depolymerization during shipping
• Melting point 62°C confirms crystalline form
• Distinguish from paraformaldehyde (Chapter 39)