MAGNESIUM SULFATE- ▸ Desiccant: Dehydrating and drying agent for solvents and processes
- ▸ Fertilizers: Soluble magnesium and sulfur nutrient source
- ▸ Textiles: Weighting, dyeing, and printing aid for cotton and silk
- ▸ Leather: Tanning auxiliary
- ▸ Feed and food: Magnesium nutrient supplement
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 →Anhydrous magnesium sulfate (CAS 7487-88-9, MgSO4) is supplied as a USP-grade powder. It serves as a drying and dehydrating agent and is used across fertilizer manufacture, textile weighting and dyeing, leather tanning, and as a magnesium nutrient source in feed and food.
Frequently Asked Questions
What is anhydrous magnesium sulfate used for?
Anhydrous magnesium sulfate (CAS 7487-88-9, MgSO4) is used industrially as a drying and dehydrating agent for solvents and process streams, as a soluble magnesium and sulfur nutrient in fertilizers, as a weighting and dyeing aid in textile processing, as a tanning auxiliary in leather, and as a magnesium source in feed and food. We supply it as a USP-grade powder in bulk.
Is magnesium sulfate (USP) the same as Epsom salt?
Epsom salt is magnesium sulfate heptahydrate (MgSO4·7H2O), the hydrated crystalline form. The USP anhydrous powder we supply is the water-free form (MgSO4) with no waters of crystallization, so its magnesium content per unit weight is higher. Both share CAS-family identity but differ in hydration state, density, and handling.
What is the difference between magnesium sulfate and anhydrous magnesium sulfate?
The difference is bound water. Standard magnesium sulfate is typically the heptahydrate (MgSO4·7H2O); the anhydrous grade contains no waters of hydration, which is why it functions as an effective desiccant. Anhydrous powder carries a higher MgSO4 assay per kilogram and is preferred where moisture must be excluded.
Is anhydrous magnesium sulfate water soluble?
Yes. Magnesium sulfate is freely water soluble; the anhydrous form is strongly hygroscopic and dissolves readily, releasing heat as it hydrates. This solubility underlies its use as a drying agent and as a soluble Mg/S nutrient source. Consult the SDS for handling of the hygroscopic powder.
What is the cost of bulk anhydrous magnesium sulfate USP?
Bulk pricing depends on volume, packaging (bags, drums, supersacks), and delivery point. RawSource supplies USP anhydrous magnesium sulfate powder by the drum, tote, or truckload — request a bulk quote and we will return current pricing with a CoA and SDS.