Overview
Sodium molybdate (CAS 7631-95-0 ) is an inorganic molybdenum salt used across industrial and agricultural sectors primarily as a corrosion inhibitor, micronutrient source, and catalyst component.
The anhydrous form is distinguished from the common dihydrate in procurement contexts, with buyers sourcing each for different formulation requirements in various manufacturing processes.
In water treatment and closed-loop cooling systems, it functions as a non-chromate corrosion inhibitor, protecting metal surfaces in recirculating water circuits where regulatory pressure has phased out chromate alternatives.
Coatings and anticorrosive primer formulations incorporate it as a pigment extender and passivating agent, particularly in industrial protective coatings for steel substrates and heavy machinery.
In agriculture and animal feed, it supplies molybdenum as a trace element, which is critical for nitrogen fixation in legume crops and enzyme function in livestock nutrition and health.
Metalworking lubricants and extreme-pressure fluid formulations use it to reduce friction and surface wear under high-load conditions, ensuring the longevity of industrial equipment and tools.
Sodium molybdate is supplied as a white crystalline powder or granule, most commonly as the dihydrate form. Standard commercial grades include technical, feed-grade, and reagent-grade options.
Purity levels typically range from 98% to 99.5%+. Packaging ranges from 25 kg bags to bulk quantities depending on the specific grade and the intended industrial or agricultural application.
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Physical Properties
| Melting Point | 689 °C |
| Density | 3.78 g/mL at 25 °C(lit.) |
| Appearance | solid |
| Color | White |
| Odor | odorless |
| Form | Powder |
| Water Solubility | It is soluble in water. |
| Refractive Index | 1.714 |
Safety & Handling
Warning GHS07 GHS06 GHS08 Hazard Statements H301 Toxic if swallowed H315 Causes skin irritation H319 Causes serious eye irritation H332 Harmful if inhaled H335 May cause respiratory irritation H341 Suspected of causing genetic defects H351 Suspected of causing cancer H361 Suspected of damaging fertility or the unborn child H372 Causes damage to organs through prolonged or repeated exposure H373 May causes damage to organs through prolonged or repeated exposure Precautionary Statements P203 Obtain, consult and follow expert instructions for use. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P280 Wear protective gloves/protective clothing/eye protection/face protection. P317 Get emergency medical help. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P316 Get emergency medical help immediately. 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
| Storage Class | 13 - Non Combustible Solids |
| WGK (Germany) | 1 |
Other Names
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Chemical Properties
- CAS Number
- 7631-95-0
- EC Number
- 231-551-7
- Mol. Weight
- 205.93
- Category
- Pigments & Colorants