Description

Diammonium Hydrogen Phosphite is an inorganic salt of phosphorous acid, offering a stable and soluble source of phosphite ions. This compound is valued for its role as a highly effective nutrient source and systemic fungicide in modern agriculture, promoting plant health and resilience. It serves as a critical raw material for formulators in the agrochemical, water treatment, and specialty chemical industries seeking reliable phosphorus chemistry.

Application

• Agrochemical Formulations: A key active ingredient and phosphorus source in fertilizers and foliar sprays to correct deficiencies and enhance crop yield and quality.
• Fungicide and Biostimulant: Used in systemic fungicide products to control oomycete diseases (e.g., downy mildew, late blight) while stimulating plant defense mechanisms.
• Water Treatment: Acts as a corrosion inhibitor and scale preventative in industrial water cooling and boiler systems.
• Chemical Synthesis: Serves as a phosphorus precursor in the manufacture of other phosphite salts, flame retardants, and stabilizers.
• Nutrient Solutions: A component in hydroponic and fertigation systems for precise delivery of phosphorus to plants.
• Preservative & Stabilizer: Used in certain industrial processes and material formulations to prevent oxidative degradation.

Basic Information

Product Name	Diammonium Hydrogen Phosphite
CAS No.	51503-61-8
Molecular Formula	(NH4)2HPO3
Molecular Weight	134.07 g/mol
Synonyms	Diammonium phosphite; Ammonium phosphite, dibasic; Ammonium hydrogen phosphite; Phosphorous acid, diammonium salt; Diammonium phosphonate; DAP; DAPh; (NH4)2HPO3
EINECS	257-218-9

Quality Control

Our Diammonium Hydrogen Phosphite is manufactured under a strict quality management system. Each batch is tested to ensure it meets precise specifications for purity, composition, and physical properties. Certificates of Analysis (COA) documenting key parameters such as assay, heavy metal content, and solubility are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and must be kept in original packaging or a suitable moisture-proof container to prevent caking and degradation.

Specification

Item	Specification
Appearance	White crystalline powder or granules
Identification (IR)	Conforms
Assay (as (NH4)2HPO3)	≥ 98.0 %
pH (10% solution)	6.0 - 7.5
Water Insolubles	≤ 0.1 %
Heavy Metals (as Pb)	≤ 10 ppm
Loss on Drying	≤ 0.5 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.