Overview
Magnesium sulfate monohydrate (CAS 14168-73-1 ), also designated E518 , is an inorganic magnesium salt supplying both magnesium and sulfate ions across food, agricultural, and industrial applications.
It functions primarily as a mineral supplement, pH buffer, and nutrient source in formulations where controlled water content is critical compared to the heptahydrate form.
In food and beverage manufacturing, it acts as an acidity regulator and magnesium fortification agent in products such as sports drinks, infant formula, and functional foods.
Breweries use it to adjust sulfate levels in process water, directly influencing mineral profile and flavor development in finished beer. In agriculture, it supplies magnesium to correct soil deficiencies.
It is incorporated into foliar sprays and compound fertilizer blends. Pharmaceutical manufacturers use it as an excipient and mineral source in tablet and oral supplement formulations.
This is particularly useful where moisture-sensitive processing demands a lower-hydrate form. The product is supplied as a white powder or granule for various industrial requirements.
Standard grades include food-grade ( FCC , E518-compliant), USP / BP pharmaceutical grade, and technical grade for agricultural and industrial use.
Packaging typically ranges from 25 kg bags to bulk quantities depending on grade and application. This ensures stability and ease of handling for diverse manufacturing environments.
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Physical Properties
| Melting Point | 150 °C (dec.)(lit.) |
| Density | 2.57 g/mL at 25 °C(lit.) |
| Color | colorless monoclinic crystals, crystalline |
| Form | colorless monoclinic crystals |
| Water Solubility | H2O: 37.1% (67.5°C), 8% (170°C), 0.5% (240°C) [KIR81] |
Trade & Regulatory
| Storage Class | 11 - Combustible Solids |
| WGK (Germany) | 1 |
Other Names
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Chemical Properties
- CAS Number
- 14168-73-1
- EC Number
- 604-246-5
- Mol. Weight
- 138.39
- Category
- Vitamins & Nutrients