Description

Zinc Hydroxide Oxide Phosphite (Zn4(OH)O2(PO3)), Dihydrate is a specialized inorganic compound that functions as a multifunctional additive and precursor. This material matters for its unique combination of zinc, hydroxide, oxide, and phosphite groups, offering properties such as corrosion inhibition, flame retardancy, and potential as a functional filler. Industrial buyers in sectors like polymer manufacturing, corrosion-resistant coatings, and specialty ceramics seek this compound for its ability to enhance material performance and stability under demanding conditions.

Application

• Polymer Stabilizer & Flame Retardant: Acts as a synergistic additive in PVC, polyolefins, and engineering plastics to improve thermal stability and reduce flammability.
• Corrosion Inhibiting Pigment: Used in primer formulations for metals (e.g., steel, galvanized steel) to provide long-term protection against rust and oxidation.
• Ceramic Precursor & Functional Filler: Serves as a source material for producing specialty zinc phosphite ceramics or as a functional filler in composites to modify electrical or thermal properties.
• Wood Preservative Component: Incorporated into treatments to protect lumber from fungal decay and insect damage due to its biocidal zinc and phosphite ions.
• Lubricant Additive: Functions as an anti-wear and extreme pressure (EP) additive in grease and solid lubricant formulations.
• Catalyst Support or Precursor: Utilized in the preparation of heterogeneous catalysts for organic synthesis reactions.

Basic Information

Product Name	Zinc Hydroxide Oxide Phosphite (Zn4(OH)O2(PO3)), Dihydrate
CAS No.	55799-16-1
Molecular Formula	Zn4H4O10P2 • 2H2O or Zn4(OH)O2(PO3) • 2H2O
Molecular Weight	Approx. 548.40 g/mol (Dihydrate)
Synonyms	Zinc Hydroxide Phosphite Oxide; Basic Zinc Phosphite; Tetrazinc Dihydrogen Phosphite Oxide Dihydrate; Zinc Oxide Hydroxide Phosphite; Zinc Phosphite Hydroxide; Zn4(OH)O2(PO3)•2H2O; Phosphorous acid, zinc salt, basic; CAS 55799-16-1
EINECS	Contact for details

Quality Control

Our Zinc Hydroxide Oxide Phosphite Dihydrate is manufactured under a strict quality management system. Each batch undergoes rigorous testing to ensure consistency and compliance with agreed specifications, including assay (zinc and phosphite content), moisture loss, and impurity profiles. Certificates of Analysis (COA) documenting these results are provided with every shipment to guarantee traceability and 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed immediately after use to prevent absorption of atmospheric moisture, which can affect product performance and flow characteristics.

Specification

Item	Specification
Appearance	White to off-white powder
Identification (IR)	Conforms
Assay (as Zn4(OH)O2(PO3)•2H2O)	≥ 95.0 %
Zinc (Zn) Content	Contact for details
Phosphite (PO3) Content	Contact for details
Loss on Drying	≤ 5.0 %
Heavy Metals (as Pb)	≤ 20 ppm
Particle Size (D50)	Contact for details

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