Description

Disodium Hydrogen Phosphate Dihydrate is a high-purity inorganic salt widely used as a buffering agent, emulsifier, and nutrient source. Its consistent quality and reliable performance make it a critical raw material for ensuring process stability and product efficacy across multiple industries. This compound is essential for manufacturers in the pharmaceutical, food & beverage, and industrial water treatment sectors who require precise pH control and mineral supplementation.

Application

• Pharmaceutical Buffer & Excipient: Used in the formulation of injectables, oral solutions, and tablets to maintain stable pH and as a source of phosphorus.
• Food Additive (E339(ii)): Functions as an emulsifying salt in processed cheeses, a pH regulator in beverages, and a mineral supplement.
• Industrial Water Treatment: Acts as a corrosion inhibitor and scale control agent in boiler water and cooling systems.
• Laboratory Reagent: Serves as a standard buffer component in analytical chemistry and molecular biology applications.
• Detergent & Cleaning Agent Builder: Enhances cleaning efficiency by sequestering water hardness ions in industrial and institutional formulations.
• Textile Processing: Used in dyeing and finishing processes as a pH stabilizer and weighting agent.
• Ceramics & Metal Surface Treatment: Employed in electroplating baths and as a component in ceramic glazes.

Basic Information

Product Name	Disodium Hydrogen Phosphate Dihydrate
CAS No.	10028-24-7
Molecular Formula	Na2HPO4·2H2O
Molecular Weight	177.99 g/mol
Synonyms	DSP Dihydrate; Disodium Phosphate Dihydrate; Sodium Phosphate Dibasic Dihydrate; sec-Sodium Phosphate Dihydrate; Na2HPO4.2H2O; E339(ii); Sorensen's Phosphate Buffer Salt; Disodium Orthophosphate Dihydrate
EINECS	231-448-7 (Anhydrous basis)

Quality Control

Our Disodium Hydrogen Phosphate Dihydrate is manufactured under a strict quality management system. We offer grades compliant with major pharmacopoeial standards including USP-NF, Ph. Eur., BP, and JP, as well as FCC for food applications. Every batch undergoes rigorous analytical testing to ensure identity, purity, and conformance to specifications. Certificates of Analysis (COA) are provided and traceability is maintained for full supply chain accountability.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed after opening to prevent caking and absorption of atmospheric moisture. Keep away from strong acids.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms
Assay (Na2HPO4·2H2O)	98.0 - 102.0 %
pH (5% solution, 25°C)	8.5 - 9.5
Loss on Drying	19.0 - 21.0 %
Water Insoluble Matter	≤ 0.2 %
Chloride (Cl)	≤ 0.05 %
Sulfate (SO4)	≤ 0.05 %
Heavy Metals (as Pb)	≤ 10 ppm
Arsenic (As)	≤ 3 ppm

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