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2920.90.51.00/Boric Acid Trimethyl Ester/Mexico

Boric Acid Trimethyl Ester from Mexico

Trimethyl borate, ester of boric acid and methanol, used as boron source in ceramics, flame retardants, and organic synthesis. HTS 2920.90.51.00 covers esters of boron inorganic acid (nonmetal). Volatile liquid intermediate.

Duty Rate — Mexico → United States

13.7%

Rate breakdown

9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
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Import Tips

• Hydrolyzes in air; import under nitrogen requires special packaging declaration

• Boron content assay confirms inorganic acid ester status