Phosphoric Acid (Food Grade)
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Huanggang Quanwang Chemical Co. , Ltd. , is a specialized manufacturer of Phosphoric Acid (Food Grade) (15000 tons per year) and Hypophosphorous Acid (3000 tons per year) in China. We also produce Sodium Hypophosphite (5000 tons per year) , Tetrakis Hydroxymethyl Phosphonium Sulfate (THPS) (2500 tons per year) and Tricalcium Phosphate (Feed Grade) (5000 tons per year) .
Phosphoric Acid (Food Grade)
Appearance Clear to yellowish liquid
H3PO4 85.0 % min
Fluoride, as F 0.001% max
Chloride, as Cl 0.0005 % max
Sulfate 0.005% max
Fe 0.002% max
Arsenic, as As 1ppm max
Heavy metals, as Pb 10ppm max
Easy Oxidized Matter, as H3PO3 0.012% max
Package: In 200L drum or 1000L IBC
Phosphoric acid may be used as a "rust converter", by direct application to rusted iron, steel tools, or surfaces. The phosphoric acid converts reddish-brown iron(III) oxide (rust) to black ferric phosphate, FePO4.
"Rust converter" is sometimes a greenish liquid suitable for dipping (in the same sort of acid bath as is used for pickling metal) , but it is more often formulated as a gel, commonly called naval jelly. It is sometimes sold under other names, such as "rust remover" or "rust killer". As a thick gel, it may be applied to sloping, vertical, or even overhead surfaces.
After treatment, the black ferric-phosphate coating can be scrubbed off, leaving a fresh metal surface. Multiple applications of phosphoric acid may be required to remove all rust. The black phosphate coating can also be left in place, where it will provide moderate further corrosion resistance. (Such protection is also provided by the superficially similar Parkerizing and blued electrochemical conversion coating processes. )
Processed food use
Food-grade phosphoric acid (additive E338) is used to acidify foods and beverages such as various colas, but not without controversy regarding its health effects. It provides a tangy or sour taste and, being a mass-produced chemical, is available cheaply and in large quantities. The low cost and bulk availability is unlike more expensive seasonings that give comparable flavors, such as citric acid which is obtainable from lemons and limes. (However most citric acid in the food industry is not extracted from citrus fruit, but fermented by Aspergillus niger mold from scrap molasses, waste starch hydrolysates and phosphoric acid. )
Phosphoric acid is used as the electrolyte in phosphoric-acid fuel cells. It is also used as an external standard for phosphorus-31 Nuclear magnetic resonance (NMR) .
Phosphoric acid is used as a cleaner by construction trades to remove mineral deposits, cementitious smears, and hard water stains. It is also used as a chelant in some household cleaners aimed at similar cleaning tasks.
Hot phosphoric acid is used in microfabrication to etch silicon nitride (Si3N4) . It is highly selective in etching Si3N4 instead of SiO2, silicon dioxide. 
Phosphoric acid is used as a flux by hobbyists (such as model railroaders) as an aid to soldering.
Phosphoric acid is also used in hydroponics pH solutions to lower the pH of nutrient solutions. While other types of acids can be used, phosphorus is a nutrient used by plants, especially during flowering, making phosphoric acid particularly desirable. General Hydroponics pH Down liquid solution contains phosphoric acid in addition to citric acid and ammonium bisulfate with buffers to maintain a stable pH in the nutrient reservoir.
Phosphoric acid is used as an electrolyte in copper electropolishing for burr removal and circuit board planarization.
Phosphoric acid is used with distilled water (2-3 drops per gallon) as an electrolyte in oxyhydrogen (HHO) generators.
Phosphoric acid is used as a pH adjuster in cosmetics and skin-care products. 
Phosphoric acid is used as a chemical oxidizing agent for activated carbon production. 
Phosphoric acid is also used for High Performance Liquid Chromatography.
Phosphoric acid can be used as an additive to stabilize acidic aqueous solutions within a wanted and specified pH range
Phosphoric acid is the key ingredient that gives the bite taste in widely consumed Coca-Cola and Pepsi sodas.