When procuring magnesium sulfate for industrial, agricultural, or other applications, buyers often encounter two primary forms: Magnesium Sulfate Anhydrous (CAS 7487-88-9) and Magnesium Sulfate Heptahydrate (CAS 10034-99-8). Understanding the distinctions between these forms is crucial for selecting the most suitable product and ensuring optimal performance. As a prominent manufacturer and supplier, we offer both, providing insights to help you buy the right material for your needs.

The fundamental difference lies in their hydration state. Magnesium Sulfate Anhydrous, as its name suggests, contains no water molecules. Its formula is simply MgSO₄. In contrast, Magnesium Sulfate Heptahydrate, commonly known as Epsom salt, has seven molecules of water of crystallization incorporated into its structure, giving it the formula MgSO₄·7H₂O. This difference in water content affects their molecular weight and their characteristics.

Magnesium Sulfate Anhydrous has a higher percentage of magnesium and sulfur by weight compared to the heptahydrate form. This makes it a more concentrated source of these essential nutrients. Consequently, anhydrous magnesium sulfate is often preferred in applications where minimizing water content is important, such as in certain drying agents or specific chemical synthesis processes. Its dry, powdery form is also advantageous for some industrial formulations.

Magnesium Sulfate Heptahydrate, while having a lower concentration of Mg and S per unit weight, is generally more accessible and commonly used in many applications, including agriculture, pharmaceuticals, and personal care. Its crystalline structure makes it easy to handle, and its high solubility in water is a significant advantage for liquid applications like fertigation or topical soaks. For many agricultural uses, the convenience and cost-effectiveness of the heptahydrate form often make it the preferred choice.

When selecting between the two, consider your specific application's requirements for magnesium and sulfur concentration, water content, solubility, and handling characteristics. As a dedicated supplier, we can provide detailed specifications for both anhydrous and heptahydrate forms to help you make an informed decision. We assure consistent quality and competitive prices for all our Magnesium Sulfate products, sourced directly from our manufacturing facilities in China. Partner with us to secure the most appropriate magnesium sulfate for your business needs.