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Other Names: Ortho phosphoric acid, phosphoric anhydride. Phosphorus pentoxide, formula P2O5, absorbs moisture to form phosphoric acid H3PO4.
Viscosity: At ambient temperatures, viscosity varies from thin at the 50 and 75% strengths to a syrupy liquid at the 85% strength, to crystals at 100% phosphoric acid.
Sp. Gr.: Solid - 1.8
Remarks: Phosphoric acid is a clear, colorless, odorless, sparkling liquid, or a transparent, crystalline solid, depending on the concentration and the temperature. The percent concentration of acid is frequently given as a percentage of P2O5, e.g., 75% phosphoric acid contains 54% P2O5, 58% phosphoric acid contains 42% P2O5. Phosphoric acid is used in making fertilizers, soaps and detergents, in pickling and rust-proofing of metals, in pharmaceuticals, sugar refining, water treatment, animal feeds, waxes and polishes and in foods. CAUTION! Phosphoric acid causes skin irritation. Some phosphoric acids contain impurities which can affect corrosive and abrasive nature of the acid.
Pump Notes: Stainless steel construction is satisfactory. PTFE or Kalrez® elastomers are recommended as is a mechanical shaft seal.
Kalrez® is a registered trademark of DuPont Dow Elastomers®, L.L.C.