Description

Silicotungstic Acid 26-Water is a highly versatile heteropoly acid catalyst and reagent, known for its strong acidity and redox properties. This compound is critical for driving complex organic syntheses and catalytic processes where high selectivity and activity are required. It is essential for manufacturers and research institutions in the chemical, pharmaceutical, and materials science sectors seeking efficient and reusable catalysts.

Application

• Homogeneous and Heterogeneous Catalysis: A powerful acid catalyst for esterification, alkylation, and condensation reactions in fine chemical synthesis.
• Electrolyte & Electrochemical Systems: Used in proton-conducting membranes for fuel cells and as an additive in electroplating baths.
• Analytical Chemistry Reagent: Acts as a precipitating agent for alkaloids and proteins, and as a staining agent in microscopy.
• Material Science & Coatings: Employed in the preparation of anti-corrosive coatings, functional thin films, and nanocomposite materials.
• Pharmaceutical Intermediates: Facilitates key synthetic steps in the production of active pharmaceutical ingredients (APIs).
• Environmental Technology: Investigated for use in photocatalytic degradation processes for wastewater treatment.

Basic Information

Product Name	Silicotungstic Acid 26-Water
CAS No.	59659-72-2
Molecular Formula	H4O40SiW12 · 26H2O or H4[SiW12O40] · 26H2O
Molecular Weight	3310.61 g/mol (Anhydrous basis: 2878.17 g/mol)
Synonyms	Tungstosilicic Acid; Silicon Tungstate; Dodecatungstosilicic Acid; STA; H4SiW12O40; Keggin-type Heteropoly Acid; 12-Tungstosilicic Acid; α-SiW12
EINECS	Contact for details

Quality Control

Our Silicotungstic Acid 26-Water is produced under stringent quality management protocols. Each batch undergoes comprehensive analytical testing to ensure consistent purity, catalytic activity, and chemical composition. A detailed Certificate of Analysis (COA) is provided with every shipment, documenting key parameters such as assay, heavy metal content, and loss on drying.

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 nature, the container must be kept tightly sealed to prevent moisture absorption and caking. Keep away from incompatible materials such as strong bases and organic materials.

Specification

Item	Specification
Appearance	White to pale yellow crystalline powder
Identification (IR)	Conforms
Assay (as H4SiW12O40)	≥ 98.0 %
Loss on Drying	≤ 25.0 %
Chloride (Cl)	≤ 0.005 %
Sulfate (SO4)	≤ 0.01 %
Heavy Metals (as Pb)	≤ 0.001 %
Iron (Fe)	≤ 0.001 %
Solubility (in Water)	Clear, colorless solution

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