Magnesium Chloride Hexahydrate (CAS 7791-18-6) is deliquescent inorganic magnesium salt crystal, available in flake, granular and powder forms. It is widely used as de-icing agent, dust-control agent, food coagulant (E511), feed additive, raw material for magnesium oxide production, water-treatment chemical, building additive and biochemical reagent. Available in Industrial Grade, Food Grade (E511), Feed Grade, USP/Ph.Eur Pharma 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 Magnesium Chloride HexahydrateCAS Number 7791-18-6
EINECS‑EC 232-094-6
Synonyms Magnesium dichloride hexahydrate; MgCl₂·6H₂OMolecular Formula MgCl2⋅6H2O
Molecular Weight 203.30 g/mol
Chemical Family Inorganic hydrated magnesium chloride salt
Available Grade Industrial Grade; Food Grade(E511); Feed Grade; USP-Ph.Eur Pharma Grade
Regulatory Status REACH registered; Non-CMR, Non-PFAS, Non-nano; FCC compliant for food applicationPhysical & Chemical Characteristics
Physical form White / colourless deliquescent flakes, granules or crystalline powder
Odour Odourless, bitter salty taste
Melting behaviour Decomposes at ~117 °C, loses crystal water upon heating
Density (20 °C) 1.569-1.570 g/cm³
Solubility in water Highly soluble (~1670 g/L @20℃), aqueous solution weakly acidicSolubility Soluble in ethanol; insoluble in most organic solvents
pH (50 g/L solution,25 °C) 4.5-7.0
Bulk density 700-900 kg/m³ (flake / granule)
Processing hint Strongly deliquescent; absorbs moisture rapidly in humid air. Avoid strong alkali which precipitates magnesium hydroxide.
Quality Requirements
| Test Parameter | Industrial Grade | Food Grade(E511) | Feed Grade | USP/Ph.Eur Pharma Grade | Test Method |
|---|---|---|---|---|---|
| Assay (MgCl₂·6H₂O) | ≥98.0 % | 99.0‑101.0 % | ≥98.5 % | 99.0‑102.0 % | Complexometric titration |
| Water‑insoluble matter | ≤0.10 % | ≤0.05 % | ≤0.10 % | ≤0.005 % | Gravimetry |
| pH (50 g/L,25℃) | 4.5‑7.0 | 4.5‑7.0 | 4.5‑7.0 | 4.5‑7.0 | Potentiometry |
| Sulfate (SO₄²⁻) | ≤0.30 % | ≤0.05 % | ≤0.10 % | ≤0.02 % | Turbidimetry |
| Bromide (Br⁻) | ‑ | ≤0.50 % | ‑ | ≤0.20 % | Titration |
| Heavy Metals (as Pb) | ≤20 ppm | ≤10 ppm | ≤15 ppm | ≤5 ppm | AAS |
| Arsenic (As) | ‑ | ≤2 ppm | ≤3 ppm | ≤2 ppm | AAS |
| Iron (Fe) | ≤0.05 % | ≤0.01 % | ≤0.03 % | ≤0.005 % | AAS |
Main Functions & Recommended Applications
Road & Environment: Anti‑icing / de‑icing agent, dust‑suppression agent for roads and mining sites.
Food Industry: Food additive E511, coagulating agent for tofu and soybean‑based food products (food grade required).
Feed Industry: Magnesium nutrition supplement for animal feed premix.
Building Material: Raw material for magnesium cement, fire‑proof board production.
Water‑treatment & Chemical: Magnesium source for waste‑water treatment; starting raw material for manufacturing magnesium oxide and other magnesium chemicals.
Biochemical & Pharma: Raw material for buffer solution, pharmaceutical excipient (pharmacopoeia grade required).
Important note:
Magnesium chloride hexahydrate is highly deliquescent. Exposure to humid atmosphere causes caking. When mixed with strong alkali, magnesium hydroxide precipitate will form. 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.
Shelf-life: 24 months under original sealed storage.
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