Description

Sodium Metatungstate is a high-density, water-soluble inorganic salt of tungsten. This compound is valued for its ability to form extremely dense aqueous solutions, making it a critical material for separation and analysis processes. It is primarily utilized by industries and research laboratories involved in mineral processing, environmental science, and materials characterization.

Application

• As a heavy liquid for mineral separation and density gradient centrifugation in geology and mining.
• Preparation of high-density media for particle analysis and sink-float testing.
• Used in the formulation of catalysts for various chemical synthesis processes.
• As a tungsten source in the preparation of other tungsten compounds and materials.
• Employed in electron microscopy as a staining or contrasting agent for biological samples.
• Potential use in radiation shielding materials due to the high atomic number of tungsten.
• In ceramic and glass manufacturing to modify properties like density and refractive index.

Basic Information

Product Name	Sodium Metatungstate
CAS No.	12141-67-2
Molecular Formula	Na6[H2W12O40] • xH2O
Molecular Weight	Approx. 2986.2 (Anhydrous)
Synonyms	Sodium Polytungstate; Sodium Tungstate(VI) Metatungstate; SPT; Sodium Metatungstate Hydrate; Sodium Tungstate Metatungstate; Sodium 12-Tungstometallate; Sodium Dodecatungstometallate; Sodium Metatungstate Solution
EINECS	235-223-7

Quality Control

Our Sodium Metatungstate is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure consistent purity, density, and solution clarity. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with every shipment to guarantee compliance with your technical requirements.

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 maintain stability. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	White crystalline powder or colorless solution
Assay (as Na6W12O40)	≥ 98.0%
Density of Aqueous Solution (20°C)	Up to 3.1 g/cm³ (Grade Dependent)
pH (5% Solution)	3.0 - 5.0
Chloride (Cl)	≤ 0.01%
Sulfate (SO4)	≤ 0.01%
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.