Description

Sodium Phosphite is an inorganic salt widely recognized for its utility as a reducing agent and corrosion inhibitor. Its effectiveness in stabilizing formulations and preventing oxidative degradation makes it a critical component in several high-value industrial processes. Key industries that rely on this compound include water treatment, polymer manufacturing, and specialty chemical synthesis.

Application

• Water Treatment: Acts as a powerful reducing agent and oxygen scavenger in boiler feedwater and cooling systems to prevent corrosion and scale formation.
• Polymer & Plastics Industry: Serves as a stabilizer and antioxidant in the production of polyamides (nylon) and other polymers to enhance thermal stability and prevent yellowing.
• Chemical Synthesis: Used as a reducing agent in organic synthesis and as a precursor for the manufacture of other phosphite salts and flame retardants.
• Agriculture: Functions as a source of phosphorus and as a buffering agent in certain fertilizer and pesticide formulations.
• Metal Surface Treatment: Employed in electroplating baths and metal finishing processes to improve coating quality and adhesion.
• Oilfield Chemicals: Utilized as a component in drilling fluid additives for its corrosion inhibition properties.

Basic Information

Product Name	Sodium Phosphite
CAS No.	15475-67-9
Molecular Formula	Na2HPO3 • xH2O
Molecular Weight	125.96 g/mol (anhydrous basis)
Synonyms	Disodium hydrogen phosphite; Disodium phosphite; Phosphorous acid, disodium salt; Sodium hydrogen phosphite; Disodium monohydrogen phosphite; Na2HPO3; Disodium phosphonate
EINECS	239-500-2

Quality Control

Our Sodium Phosphite is manufactured under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise chemical and physical specifications. A Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to guarantee traceability and compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Due to its hygroscopic (moisture-sensitive) nature, the material must be stored in a cool, dry, and well-ventilated area. Ideal storage temperature is between 15°C and 25°C. Keep the container tightly sealed when not in use to prevent absorption of atmospheric moisture, which can lead to caking or reduced efficacy.

Specification

Item	Specification
Appearance	White crystalline powder or granules
Identification (IR)	Conforms
Assay (as Na2HPO3)	≥ 98.0 %
pH (5% solution)	8.0 - 10.0
Water Insolubles	≤ 0.1 %
Chloride (as Cl)	≤ 0.01 %
Sulfate (as SO4)	≤ 0.05 %
Heavy Metals (as Pb)	≤ 10 ppm

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