Dimethoxymethane (Methylal) from Mexico
Dimethoxymethane, also known as methylal, is the dimethyl acetal of formaldehyde and an acyclic ether of monohydric methanol. Used as a solvent and chemical intermediate, it qualifies under HTS 2909.19.18.00 as an 'other' acyclic ether of monohydric alcohols per Chapter 29 definitions. This excludes it from cyclic acetal provisions.
Duty Rate — Mexico → United States
15.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Declare exact chemical composition and CAS number (109-87-5) on commercial invoice
• Provide flammability data and flash point for proper hazmat classification
• Avoid retail packaging that might reclassify under Chapter 38 preparations