Phosphoric acid, also known as orthophosphoric acid or phosphoric(V) acid, is a weak acid with the chemical formula H3PO4.
P 2017 (OTTO) Polyphosphoric acid, GR Cas 8017-16-1 - used in compound semiconductor processing, to etch Indium gallium arsenide selectively with respect to indium phosphide. P 2017 (OTTO) Polyphosphoric acid, GR Cas 8017-16-1 - used as a pH adjuster in cosmetics and skin-care products.