Description

Silicotungstic Acid CAS NO 12520-88-6 is a heteropoly acid of tungsten and silicon, known for its strong acidity and utility as a versatile catalyst. This compound is valued for its high thermal stability and reusability in demanding chemical processes. It is essential for manufacturers and research laboratories in the chemical synthesis, petrochemical, and material science sectors.

Application

• Homogeneous and Heterogeneous Catalyst for esterification, alkylation, and condensation reactions in fine chemical synthesis.
• Acid Catalyst in Petrochemicals for processes such as fuel upgrading and cracking.
• Component in Analytical Chemistry as a reagent for the precipitation and detection of alkaloids and proteins.
• Precursor for Functional Materials used in the preparation of electrochromic devices, sensors, and anti-corrosion coatings.
• Cross-linking Agent in polymer chemistry to modify the properties of various resins and composites.
• Research & Development for exploring new catalytic systems and energy-related applications.

Basic Information

Product Name	Silicotungstic Acid
CAS No.	12520-88-6
Molecular Formula	H4O40SiW12 (Common Hydrate: H4[SiW12O40]·xH2O)
Molecular Weight	2878.17 g/mol (Anhydrous)
Synonyms	Tungstosilicic Acid; Silicon Tungstate; Dodecatungstosilicic Acid; STA; H4SiW12O40; Keggin-type Heteropoly Acid; 12-Tungstosilicic Acid; α-Keggin Acid
EINECS	235-719-9

Quality Control

Our Silicotungstic Acid is manufactured under a strict quality management system. Each batch is tested to ensure it meets high-purity standards for catalytic and research applications. A comprehensive Certificate of Analysis (COA) detailing assay, impurity profile, and physical properties is provided with every shipment.

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 (moisture-sensitive) nature, the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which can affect product performance.

Specification

Item	Specification
Appearance	White to pale yellow crystalline powder
Identification (IR)	Conforms to standard
Assay (as H4SiW12O40)	≥ 99.0%
Loss on Drying	≤ 2.0 %
Chloride (Cl)	≤ 0.005%
Sulfate (SO4)	≤ 0.01%
Heavy Metals (as Pb)	≤ 10 ppm
Solubility (in Water)	Clear, colorless solution

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