Boron-bearing minerals mined and concentrated before export — including colemanite, ulexite, and tincal — fall here, along with natural boric acid at or below 85% purity on a dry-weight basis; borates recovered directly from natural brine are excluded. The US is itself a major boron producer, so import volumes tend to reflect specialty grades or concentrate qualities not readily available domestically. Downstream buyers include glass and fiberglass manufacturers, ceramic producers, and agricultural micronutrient formulators, making grade consistency and moisture content critical specification points at entry.

AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.