Anhydrous Magnesium Chloride (CAS 7786-30-3) is anhydrous inorganic magnesium salt, white highly hygroscopic solid, no crystal water. Different from magnesium chloride hexahydrate (7791-18-6), it is suitable for anhydrous reaction systems, production of metallic magnesium, catalyst, desiccant, raw material for high-purity magnesium chemicals, oil-field chemicals and organic synthesis auxiliary. Available in Industrial Grade, Synthesis Grade / Anhydrous High‑Purity Grade. TNJ Chemical is a professional manufacturer and exporter since 2001. We guarantee high-quality products, competitive prices and thoughtful service. If you want to buy or have any other inquiries, please contact sales@tnjchem.com
General Product Data
Product Name Anhydrous Magnesium Chloride
CAS Number 7786-30-3
EINECS‑EC 232-094-6Synonyms Magnesium dichloride anhydrous; MgCl₂
Molecular Formula MgCl2
Molecular Weight 95.21 g/mol
Chemical Family Anhydrous inorganic magnesium halide salt
Available Grade Industrial Grade; Synthesis High-Purity Grade
Regulatory Status REACH registered; Non-CMR, Non-PFAS, Non-nano; extremely hygroscopic
Physical & Chemical Characteristics
Physical form White / off-white granular or powdery solid
Odour Odourless
Melting Point 714 °C
Boiling Point 1412 °C
Density (20 °C) 2.32 g/cm³
Solubility in water Freely soluble, strong exothermic dissolution, aqueous solution acidic
Solubility Soluble in ethanol; insoluble in ether, hydrocarbon solventspH (50 g/L aqueous solution) 4.0-6.0
Bulk density 800-1100 kg/m³
Processing hint Extremely hygroscopic, rapidly absorbs moisture from air. Must be stored under dry seal. Reacts with strong alkali to precipitate magnesium hydroxide.Quality Requirements
| Test Parameter | Industrial Grade | Synthesis High‑Purity Grade | Test Method |
|---|---|---|---|
| Assay (MgCl₂) | ≥98.0 % | ≥99.0 % | Complexometric titration |
| Water content | ≤1.0 % | ≤0.30 % | Karl‑Fischer Titration |
| Water‑insoluble matter | ≤0.20 % | ≤0.05 % | Gravimetry |
| Sulfate (SO₄²⁻) | ≤0.20 % | ≤0.05 % | Turbidimetry |
| Iron (Fe) | ≤0.05 % | ≤0.010 % | AAS |
| Heavy Metals (as Pb) | ≤15 ppm | ≤5 ppm | AAS |
| Calcium (Ca) | ≤0.30 % | ≤0.10 % | AAS |
Main Functions & Recommended Applications
Metallurgical Industry: Raw material for electrolytic production of metallic magnesium.
Chemical Synthesis: Anhydrous magnesium source for organic synthesis, Lewis acid catalyst, desiccant for organic solvent drying.Oil‑field Chemical: Clay stabilizer for drilling fluid under anhydrous system requirements.
Material manufacturing: Raw material for manufacturing high‑purity magnesium oxide and other magnesium fine chemicals.
Building industry: Raw material for anhydrous magnesium cement formulations.Important note:
Anhydrous magnesium chloride is highly hygroscopic, exposure to air will absorb water quickly and cause caking. Not interchangeable with magnesium chloride hexahydrate for anhydrous reactions. End‑user shall validate suitability for own formulation and final application. Refer to SDS for full safety guidance.
Logistics & Storage Information
Packaging options: 25 kg PP woven bag with inner PE liner; or as per request.
Lead‑time: Samples: 7‑15 working days against deposit.
Storage condition: Keep container tightly closed. Store in cool, dry, well‑ventilated warehouse, keep away from heat source, alkali and oxidizing agents. Strictly avoid moisture ingress.
Shelf-life: 24 months under original sealed storage.
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