Diammonium Hydrogen Phosphate CAS 7783-28-0

2.Physical and Chemical Properties

• Appearance: White crystalline powder or granules Melting point: Decomposes at approximately 155 °C Density: Approximately 1.619 g/cm³
• Solubility: Soluble in water (about 57.5 g/100 mL at 10 °C); insoluble in ethanol and acetone
• Aqueous solution: Slightly alkaline (1% solution pH about 7.8–8.0)
• Stability: Stable; hygroscopic

3.Main Functions and Applications (What are its uses?)

• Agriculture (core application): As a high-analysis nitrogen-phosphorus compound fertilizer containing about 21% nitrogen and 53% phosphorus (as P2O5), it is a fully water-soluble phosphate fertilizer especially suited to drip irrigation and foliar feeding. It promotes root development, flowering and fruit setting, markedly improving crop yield and quality.
• Industrial flame retardant: Widely used as a flame retardant for wood, paper and fibers and in fire-retardant coatings; upon heating it releases ammonia and phosphoric acid, forming a protective layer that isolates oxygen and retards combustion.
• Fermentation and microbiology: Serves as an excellent nitrogen and phosphorus source in microbial culture media, extensively used in the fermentation of yeast, antibiotics and amino acids to promote microbial growth and metabolite accumulation.
• Food: Used as a leavening agent, fermentation aid and yeast nutrient (E342) to improve the texture and volume of baked and fermented foods.
• Water treatment: Acts as a corrosion inhibitor and water stabilizer to prevent scaling and corrosion in pipelines and boilers.
• Electronics: Employed in the preparation of electronic-grade phosphates and in electroplating, meeting high-purity requirements.
• Analytical chemistry: Used as a buffering agent and precipitant.