Description

Silicotungstic Acid Hydrate is a versatile heteropoly acid catalyst and reagent, known for its strong acidity and redox properties. Its value lies in its high catalytic efficiency and stability, making it a preferred choice for demanding chemical synthesis and material science applications. This product is essential for industries including chemical manufacturing, pharmaceuticals, and materials research, where it serves as a catalyst, analytical reagent, and precursor for functional materials.

Application

• Homogeneous and Heterogeneous Catalyst: Widely used in organic synthesis reactions such as esterification, alkylation, and condensation due to its strong Brønsted acidity.
• Analytical Chemistry Reagent: Employed as a precipitating agent for the detection and quantification of alkaloids, proteins, and other basic compounds.
• Material Science Precursor: A key starting material for the preparation of tungsten-containing thin films, sensors, and anti-corrosion coatings.
• Electrolyte & Electrochemistry: Used in the formulation of electrolytes for fuel cells and electrochromic devices.
• Pharmaceutical Intermediate Synthesis: Facilitates specific acid-catalyzed steps in the synthesis of complex drug molecules.
• Textile & Dye Industry: Acts as a mordant in dyeing processes to improve color fastness.

Basic Information

Product Name	Silicotungstic Acid Hydrate
CAS No.	12027-43-9
Molecular Formula	H4O40SiW12 · xH2O
Molecular Weight	2878.17 (Anhydrous basis)
Synonyms	Tungstosilicic Acid Hydrate; Dodecatungstosilicic Acid Hydrate; Silicon Tungstate Hydrate; STA; H4SiW12O40 Hydrate; Keggin Acid; 12-Tungstosilicic Acid; α-Keggin Structure Heteropoly Acid
EINECS	234-719-8

Quality Control

Our Silicotungstic Acid Hydrate is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, composition, and performance. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profiles, and physical characteristics is provided with every shipment to guarantee traceability and compliance with your project 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 material is hygroscopic (moisture-sensitive) and should be kept under dry conditions to prevent caking or decomposition. Keep away from incompatible materials such as strong bases and reducing agents.

Specification

Item	Specification
Appearance	White to pale yellow crystalline powder
Identification (IR)	Conforms to standard
Assay (as H4SiW12O40)	≥ 98.0 %
Water of Hydration (Loss on Drying)	≤ 15.0 %
Chloride (Cl)	≤ 0.01 %
Sulfate (SO4)	≤ 0.02 %
Heavy Metals (as Pb)	≤ 0.002 %
Solubility (in Water)	Clear, colorless solution

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