Description

Silicotungstic Acid Hydrate CAS NO 12027-38-2 is a heteropoly acid of tungsten and silicon, widely recognized as a versatile and efficient solid acid catalyst. Its high acidity, thermal stability, and reusability make it a valuable alternative to conventional liquid mineral acids in green chemistry processes. This compound is essential for R&D laboratories and industrial manufacturers in sectors such as fine chemical synthesis, petrochemical refining, and materials science.

Application

• Heterogeneous Acid Catalyst: Used in esterification, alkylation, and condensation reactions as a recyclable solid acid catalyst.
• Electrolyte & Electrochemistry: Employed in electroplating baths and as a proton-conducting material in fuel cells and sensors.
• Analytical Chemistry Reagent: Acts as a precipitating agent for alkaloids, proteins, and other basic organic compounds.
• Material Science & Coatings: Serves as a precursor for synthesizing tungsten-containing thin films, anti-corrosive coatings, and functional hybrid materials.
• Photocatalysis: Utilized in the development of composite photocatalysts for environmental remediation and water splitting applications.
• Chemical Synthesis Intermediate: A key starting material for producing other tungsten-based compounds and catalysts.

Basic Information

Product Name	Silicotungstic Acid Hydrate
CAS No.	12027-38-2
Molecular Formula	H4O40SiW12 · xH2O
Molecular Weight	2878.17 (Anhydrous basis)
Synonyms	Tungstosilicic Acid Hydrate; Dodecatungstosilicic Acid Hydrate; Silicon Tungstate Hydrate; STA; H4SiW12O40·xH2O; 12-Tungstosilicic Acid; Keggin-type Heteropoly Acid
EINECS	234-719-8

Quality Control

Our Silicotungstic Acid Hydrate is manufactured under strict quality management protocols. Each batch undergoes rigorous analytical testing to ensure consistent purity and performance, meeting the high standards required for research and industrial applications. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical characteristics is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Due to its hygroscopic (moisture-sensitive) nature, store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep the container tightly sealed when not in use to minimize exposure to atmospheric moisture.

Specification

Item	Specification
Appearance	White to pale yellow crystalline powder
Identification (IR)	Conforms
Assay (as H4SiW12O40)	≥ 99.0%
Water Content (KF)	≤ 2.0%
Chloride (Cl)	≤ 0.005%
Sulfate (SO4)	≤ 0.01%
Heavy Metals (as Pb)	≤ 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.