Overview
Barium hydroxide monohydrate (CAS 22326-55-2 ) is a strong inorganic base supplied in solid form, distinct from the anhydrous and octahydrate variants in handling characteristics and water content.
It functions primarily as a pH regulator, alkaline catalyst, and precipitating agent across chemical manufacturing and industrial processing. In water treatment, it precipitates sulfate and heavy metal ions.
This enables effluent compliance in industrial discharge streams. Pharmaceutical manufacturers use it as a base catalyst in synthesis steps where controlled alkalinity and low ionic contamination are critical.
Mining and metallurgical operations apply it to adjust leach circuit pH and to remove sulfate from process water. This reduces scaling and corrosion in downstream equipment during processing.
In biotechnology and laboratory settings, it supports CO₂ absorption and reagent preparation where a reliable, consistent alkaline source is required for sensitive chemical reactions.
The product is supplied as a white powder or granule. Technical grade is the standard commercial form, with reagent and pharmaceutical grades available for higher-purity applications.
Packaging typically ranges from multi-wall bags to bulk quantities depending on application scale. All batches are manufactured to meet rigorous industrial and chemical safety specifications.
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Physical Properties
| Melting Point | 78 °C(lit.) |
| Density | 3.743 g/mL at 25 °C(lit.) |
| Color | White |
| Form | Crystalline |
| Water Solubility | Soluble in water. |
| Vapor Pressure | 300 hPa ( 78 °C) |
Trade & Regulatory
| UN Number | 3262 |
| ADR Class | 8 |
| Packing Group | III |
| Storage Class | 8B - Non-combustible corrosive hazardous materials |
| WGK (Germany) | 1 |
Other Names
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Chemical Properties
- CAS Number
- 22326-55-2
- EC Number
- 606-983-8
- Mol. Weight
- 189.36
- Category
- Alkalis & Bases