Concentrated phosphoric acid is approx. 85% H3PO4 (aqueous).

Assay (acidimetric): ≥ 99 %

Identity: passes test

Chloride (Cl): ≤ 2 ppm

Nitrate (NO₃): ≤ 2 ppm

Phosphite and Hypophosphite (as H₃PO₃): ≤ 500 ppm

Fluoride (F): ≤ 0.5 ppm

As (Arsenic): ≤ 1 ppm

Ca (Calcium): ≤ 20 ppm

Cd (Cadmium): ≤ 1 ppm

Co (Cobalt): ≤ 1 ppm

Cu (Copper): ≤ 1 ppm

Fe (Iron): ≤ 10 ppm

K (Potassium): ≤ 5 ppm

Mg (Magnesium): ≤ 1 ppm

Mn (Manganese): ≤ 1 ppm

Na (Sodium): ≤ 50 ppm

Ni (Nickel): ≤ 1 ppm

Pb (Lead): ≤ 1 ppm

Sb (Antimony): ≤ 1 ppm

Zn (Zinc): ≤ 1 ppm

Volatile acids (as CH₃COOH): ≤ 20 ppm

Substances reducing potassium permanganate (as O): ≤ 20 ppm