Description

Sodium Silicotungstate is an inorganic heteropoly acid salt known for its strong acidic and catalytic properties. This compound is valued for its versatility as a catalyst and reagent in specialized chemical synthesis and analytical procedures. It serves critical functions in industries such as chemical manufacturing, materials science, and research & development, where precise and efficient catalytic processes are required.

Application

• Heterogeneous Catalyst: Used in acid-catalyzed organic reactions, including esterification, alkylation, and dehydration processes.
• Analytical Reagent: Employed as a selective precipitating agent for the detection and isolation of alkaloids, proteins, and other basic organic compounds.
• Material Science: Acts as a precursor or additive in the synthesis of advanced functional materials and coatings.
• Ion Exchange & Separation: Utilized in selective ion exchange processes and chromatography for the separation of specific cations.
• Corrosion Inhibitor: Incorporated into formulations to provide protective coatings on metal surfaces.
• Research & Development: Serves as a model compound in studies of polyoxometalate chemistry and for developing new catalytic systems.

Basic Information

Product Name	Sodium Silicotungstate
CAS No.	12027-47-3
Molecular Formula	Na4SiW12O40 • xH2O
Molecular Weight	Contact for details (Anhydrous approx. 2876.1 g/mol)
Synonyms	Silicotungstic Acid Sodium Salt; Sodium Silicotungstate Hydrate; Sodium Tungstosilicate; Sodium 12-Tungstosilicate; STS; Silicowolframic Acid Sodium Salt; Sodium Silicon Tungstate; NaSiW
EINECS	234-722-4

Quality Control

Our Sodium Silicotungstate is manufactured under a rigorous quality management system. Each batch is tested to ensure it meets precise chemical and physical specifications. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to guarantee consistency and reliability for your industrial and research applications.

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 product is hygroscopic (moisture-sensitive) and must be kept in a dry environment to prevent caking and degradation.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (as Na4SiW12O40)	≥ 98.0 %
Loss on Drying	≤ 2.0 %
Chloride (Cl)	≤ 0.01 %
Sulfate (SO4)	≤ 0.02 %
Heavy Metals (as Pb)	≤ 10 ppm
Insoluble Matter	≤ 0.1 %

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