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| Product Name | Phosphotungstic Acid Hydrate (PTA) (Synonyms: Tungstophosphoric Acid Hydrate; 12-Phosphotungstic Acid; 12-Tungstophosphoric Acid; Dodecatungstophosphoric Acid) |
| CAS NO. | 12501-23-4 |
| Formula & Molecular Weight | H3[PW12O40]·xH2O Molecular weight: 2880.05 on anhydrous basis; actual formula weight varies with hydration level. |
| Structure | Keggin-type heteropoly acid structure |
| Typical Appearance | White to off-white crystalline powder or crystals. Phosphotungstic acid hydrate is hygroscopic and its hydration level may vary depending on grade and storage conditions. |
| Available Grade Profiles | Standard Crystal Grade:WO3 ≥81%, suitable for industrial acid, oxidation and solid-acid catalysis. High-WO3 / Low-Impurity Grade:Higher WO3 content and tighter control of selected metallic and ionic impurities may be available subject to specification review and current supply confirmation. Final specification and availability must be confirmed before quotation. |
| Key Applications |
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| Packaging & Storage | Packaging:Commercial packaging is selected according to product grade, quantity and dangerous-goods requirements. Industrial phosphotungstic acid is available in bulk packaging such as UN-approved pail cans; final packaging should be confirmed with the quotation. Storage:Keep tightly sealed in a cool, dry place. Protect from moisture because phosphotungstic acid hydrate is hygroscopic. Avoid incompatible materials and follow the actual shipment SDS. |
Royalchem suppliesPhosphotungstic Acid Hydrate (CAS 12501-23-4)for industrial heteropoly-acid catalysis and specialty chemical applications. Standard crystal grades withWO3 ≥81%and higher-WO3 / low-impurity specifications may be available depending on customer requirements and current supply conditions. We can support commercial inquiries withbatch-specific COA, SDS, specification comparison and international logistics coordination.
Contact Royalchem with your required WO3 content, impurity limits, quantity and application for specification matching and quotation.
| Parameter | Reference Specification |
| WO₃ | ≥81.0% |
| Na | ≤10 ppm |
| Cl | ≤10 ppm |
| SO₄ | ≤20 ppm |
| Fe | ≤10 ppm |
| Pb | ≤20 ppm |
| NH₄ | ≤20 ppm |
Reference industrial specification only. Final commercial specification and analytical results must follow the applicable supplier specification and batch COA.
| Acid Catalyst | Phosphotungstic acid is a strong Brønsted heteropoly acid and is used in catalyst systems requiring high acidity for organic and fine-chemical transformation. |
| Oxidation Catalyst | Used directly or as a component of catalytic systems in selected oxidation processes. Catalyst performance depends on substrate, oxidant, solvent, support and process conditions. |
| Supported / Solid Acid Catalyst | Phosphotungstic acid may be supported on inorganic or porous materials to create heterogeneous solid-acid catalyst systems and facilitate catalyst separation and reuse. |
| Laboratory & Analytical Uses | Phosphotungstic acid is also used in microscopy, histology staining and precipitation chemistry. These applications remain valid but are treated as secondary to the industrial catalyst positioning of this page. |
| What is Phosphotungstic Acid Hydrate? | Phosphotungstic Acid Hydrate is a Keggin-type heteropoly acid with the general formula H₃[PW₁₂O₄₀]·xH₂O. It is widely used as an acid, oxidation and solid-acid catalyst. |
| Can Royalchem provide COA and SDS? | Yes. Batch-specific COA, SDS and specification confirmation can be provided for commercial orders. For catalyst applications, please provide the required WO₃ content, trace-impurity limits, quantity and intended process when requesting a quotation. |
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