Denatured alcohol has had substances added — under TTB-approved formulas — that render it unfit for beverage use. The specific denaturant and its concentration must meet TTB requirements. Alcohol that does not meet those criteria remains undenatured and falls under 220710 if at 80% or higher strength.

Fuel-grade ethanol from Brazil has historically been subject to tariff-rate quota provisions and has been the subject of trade-remedy scrutiny. Importers should verify the current duty treatment and any applicable TRQ thresholds at the time of entry, as these provisions can change.