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
110%
Rate breakdown
9903.04.6094.5%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
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