SODIUM MOLYBDATE- ▸ Corrosion inhibition: Inhibitor in closed-loop cooling and water-treatment systems.
- ▸ Metal finishing: Bath additive for metal finishing and electroplating.
- ▸ Pigments: Used in the manufacture of pigments.
- ▸ Micronutrient fertilizer: Molybdenum source for crops.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →Sodium molybdate (CAS 7631-95-0, Na2MoO4) is a water-soluble molybdate salt. It is used as a corrosion inhibitor in cooling-water and metalworking systems, in pigment manufacture, as a metal-finishing bath additive, and as a molybdenum micronutrient in fertilizers.
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 231-551-7
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Solutions Using This Product
Process-solution guides on this site that specify this chemistry:
- Vapor Corrosion Inhibitors (VCI) for Metal Packaging (Industrial Manufacturing)
- Corrosion Inhibitors for Cooling Water (Steel & Copper) (Water Treatment)
- Corrosion Inhibitors for Machined Parts (Industrial Manufacturing)
Frequently Asked Questions
What is sodium molybdate used for?
Sodium molybdate (CAS 7631-95-0, Na2MoO4) is a water-soluble molybdate salt used as a corrosion inhibitor in closed-loop cooling and water-treatment systems, as a metal-finishing and electroplating bath additive, in pigment manufacture, and as a molybdenum micronutrient source in fertilizers. RawSource supplies it for water treatment, metal finishing, and agricultural applications.
What is the difference between sodium molybdate and sodium molybdate dihydrate?
The dihydrate (Na2MoO4·2H2O) carries two waters of crystallization, while the anhydrous form has none, so the dihydrate has a lower molybdenum content per unit weight. The dihydrate is the more common commercial form. Confirm which grade you need and check the assay on the CoA.
What is the molecular formula and CAS number for sodium molybdate?
The anhydrous salt is Na2MoO4 (MoNa2O4), CAS 7631-95-0; the dihydrate is Na2MoO4·2H2O. RawSource provides a CoA confirming the grade, hydrate, and assay for each lot.
How is sodium molybdate supplied in bulk, and what is the cost?
It is supplied as a crystalline powder in bags, drums, and pallet quantities. Bulk pricing depends on grade, hydrate, volume, and packaging — contact RawSource with your specification and volume for a current bulk quote, CoA, and SDS.
What grade of sodium molybdate is used for corrosion inhibition versus fertilizer?
Water-treatment and metal-finishing applications typically use a technical/industrial grade dosed as a corrosion inhibitor, while fertilizer use calls for an agricultural-grade molybdenum source; assay and impurity limits differ by application. RawSource can supply grades matched to your use — contact us with your application for the appropriate specification.
What is the REACH and TSCA regulatory status of Sodium Molybdate?
Sodium Molybdate (CAS 7631-95-0) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 231-551-7).