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

1,3,5-Trioxane Crystals from Japan

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 — Japan → United States

12.5%

Rate breakdown

9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%

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Import Tips

• Acid stabilizer prevents depolymerization during shipping

• Melting point 62°C confirms crystalline form

• Distinguish from paraformaldehyde (Chapter 39)