Phosphoric Acid
Orthophosphoric Acid, Hydrogen Phosphate
- CAS
- 7664-38-2
- EC
- 231-633-2
- Food Code
- E338
- Sectors
- Food & Nutrition, Agriculture, Lubricants & Metalworking
Phosphoric Acid (CAS 7664-38-2), also known as orthophosphoric acid, is an inorganic acid supplied as a solid or viscous liquid with a color value of ≤10 APHA, carrying the food additive code E338 and used in food acidification, fertilizer production and metal treatment. It is one of the most important inorganic acids with applications across multiple industries.
Typical Properties
| Molecular formula | H3O4P |
|---|---|
| Molecular weight | 98 g/mol |
| Form | Solid or Viscous Liquid |
| Color | ≤10(APHA) |
| Odor | Odorless |
| Melting point | 42.35 °C |
| Boiling point | 158 °C |
| Density | 1.834 g/cm³ @ Temp: 18 °C |
| Water solubility | MISCIBLE |
| pH | <0.5 (100g/l, H2O, 20°C) |
| GHS signal word | Danger · Corrosive, Acute toxicity, Irritant / harmful, Health hazard |
| HS code | 28092000 |
| Grades available | Food Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Phosphoric Acid
Applications
Used in fertilizer production, metal treatment, food acidification, and dental applications. It also serves as a pH adjuster and rust inhibitor.
Safety & Risks
Corrosive to skin and eyes; avoid inhalation of mist. Use with acid-resistant equipment and gloves.
Packaging
Supplied in 35 kg cans, 250 kg drums, or IBC tanks. Store cool, dry, and away from alkalis.