Hypophosphorous Acid
HPA, Phosphinic Acid
- CAS
- 6303-21-5
- EC
- 228-601-5
- Sectors
- Electronics & Solar PV, Pharma & Healthcare, Textiles, Leather & Paper
Hypophosphorous Acid (CAS 6303-21-5), also known as phosphinic acid, is an inorganic acid that occurs as a colorless, oily liquid or hygroscopic crystals, is stable in solution and soluble in water and alcohols, and acts as a powerful reducing agent in electroless nickel plating, pharmaceutical synthesis and textile bleaching.
Typical Properties
| Molecular formula | H3O2P |
|---|---|
| Molecular weight | 66 g/mol |
| Appearance | colourless liquid |
| Form | hygroscopic crystals or colorless oily liquid |
| Color | Colorless |
| Melting point | 26.5 °C |
| Boiling point | 108 °C (759.8513 mmHg) |
| Density | 1.479 g/cm³ @ Temp: 20 °C |
| Water solubility | SOLUBLE |
| pH | pKa1= 1.00(25°C) |
| GHS signal word | Danger · Corrosive |
| HS code | 28111990 |
| Grades available | Technical 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.
Hypophosphorous Acid
Applications
Used as a reducing agent in electroless nickel plating, polymerization inhibitors, and pharmaceutical synthesis. Also employed in the production of phosphinate salts and as a bleaching agent in textiles.
Safety & Risks
Corrosive and may release phosphine gas upon heating or contact with oxidizers. Use acid-resistant protective equipment and store under proper ventilation.
Packaging
Supplied in 25–250 kg HDPE drums or IBC tanks. Store cool, dry, and away from strong oxidizing agents and metals.