Overview
Silicotungstic acid (CAS 12027-38-2 ), also known as 12-tungstosilicic acid, is a heteropolyacid used industrially as a strong acid catalyst and analytical reagent.
Its combination of high proton activity and thermal stability makes it a practical choice for acid-catalyzed synthesis and precipitation-based analytical workflows.
In pharmaceutical manufacturing, it functions as a precipitating agent for alkaloid identification and quantification in quality control testing processes.
Catalyst applications include acid-catalyzed esterification, alkylation, and condensation reactions where a recoverable solid acid is preferred over mineral acids.
Research and fine chemical producers use it as a catalyst precursor for supported heteropolyacid systems on silica or alumina carriers for various industrial uses.
It also serves in electrochemical and materials research as a proton-conducting component in membrane and electrode formulations for advanced technology.
Silicotungstic acid is supplied as a crystalline solid or powder, typically as the hydrated form. Technical and reagent grades are the most commonly available.
Purity specifications range from technical quality up to ACS reagent grade for analytical applications. Packaging is offered in laboratory-scale or bulk quantities.
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Physical Properties
| Melting Point | >300 °C |
| Boiling Point | 210-220 °C @ Press: 1-2 Torr |
| Density | 2.099 g/cm³ |
| Color | White to Off-White |
| Form | Solid |
| Water Solubility | 3015.09g/L at 20℃ |
| Vapor Pressure | 0.024Pa at 25℃ |
Safety & Handling
Warning GHS07 GHS05 Hazard Statements H290 May be corrosive to metals H315 Causes skin irritation H319 Causes serious eye irritation H335 May cause respiratory irritation Precautionary Statements P234 Keep only in original packaging. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P271 Use only outdoors or in a well-ventilated area. P280 Wear protective gloves/protective clothing/eye protection/face protection. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P390 Absorb spillage to prevent material damage. P405 Store locked up. P406 Store in a corrosion-resistant/… container with a resistant inner liner. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| WGK (Germany) | 3 |
Other Names
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Chemical Properties
- CAS Number
- 12027-38-2
- EC Number
- 234-719-8
- Mol. Weight
- 2878.2
- Category
- Inorganic Acids