Phosphoric Acid & Polyphosphoric Acids

Phosphoric acid imports are graded by P₂O₅ concentration and end use: fertilizer-grade acid below 65% P₂O₅ (2809200010), high-concentration acid at 65% or more (2809200020), non-fertilizer-grade acid (2809200030), and polyphosphoric acids (2809200040) used in lubricant additives and specialty chemicals. Mexico and Morocco are the leading US suppliers, reflecting proximity and large phosphate-rock processing capacity respectively, with Belgium and Israel also significant sources. Fertilizer-grade and food-grade phosphoric acid serve distinct markets, and importers should confirm purity specifications and any applicable EPA or FDA requirements for the intended end use.