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    Related: Nutrient Salt Potassium Sulfate Magnesium Chloride
    • Magnesium Sulfate Heptahydrate CAS 10034-99-8

    Magnesium Sulfate Heptahydrate CAS 10034-99-8

    Magnesium Sulfate Heptahydrate (CAS 10034-99-8) is a water-soluble inorganic compound serving as a critical micronutrient source in agricultural fertilizer additives and a coagulant in industrial processing. Commonly referred to in the trade as Epsom Salt or Bitter Salt, this crystalline solid functions to correct magnesium deficiencies in soil and catalyze enzymatic reactions in biochemical applications. As a stable Sulfuric acid magnesium salt heptahydrate, it ensures high solubility and bioavailability within liquid fertilizer formulations and technical mixtures. We ensure bulk supply capabilities for this material, providing access to competitive factory pricing and customized specifications to meet specific crystal size requirements. Full technical documentation, including MSDS, TDS, COA, is available to support compliance and safety protocols.

    • CAS: 10034-99-8
    • Synonyms: Epsom Salt, Magnesium sulphate heptahydrate, Sulfuric acid magnesium salt heptahydrate, Bitter Salt
    • Einecs: 231-298-2
    • Molecular Formula: 𝑀𝑔𝑆𝑂4⋅7𝐻2𝑂
    • Grade: Agriculture Grade, Industrial Grade, Food/Pharma Grade (Bath Salt)
    • Package: 25kg/50kg PP/PE bags, 1000kg/1200kg Jumbo bags, or customized branded packaging.
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    Product Description

    Magnesium Sulfate Heptahydrate (MgSO4⋅7H2OMgSO4​⋅7H2​O) is a highly soluble, neutral salt. Often referred to as Epsom Salt, our heptahydrate crystals are produced through the reaction of high-purity magnesium oxide or magnesium carbonate with sulfuric acid, followed by a meticulous crystallization and centrifugal drying process.

    Our crystals are available in multiple sizes—from fine powder to large 1-3mm “diamond” crystals—ensuring optimal performance for different applications. In agriculture, it provides essential Magnesium and Sulfur without altering soil pH. In the personal care industry, our high-purity grades are used globally for therapeutic bath salts due to their skin-soothing and muscle-relaxing properties.

    1 Physicochemical Properties
    2 Applications
    3 Storage Conditions
    4 Safety Precautions

    Physicochemical Properties

    PropertySpecification (99.5% Grade)Test Method
    Main Content (MgSO4·7H2O)≥ 99.5%Complexometric Titration
    Magnesium Oxide (MgO)≥ 16.2%Calculation
    Magnesium (Mg)≥ 9.8%ICP-AES
    Sulfur (S)≥ 12.9%ICP-AES
    AppearanceWhite Transparent CrystalsVisual
    pH (5% Water Solution)5.0 – 8.0pH Meter
    Iron (Fe)≤ 0.001%Colorimetry
    Chloride (Cl)≤ 0.01%Turbidimetry
    Heavy Metals (as Pb)≤ 0.0005%AAS
    Arsenic (As)≤ 0.0002%AAS
    Insoluble in Water≤ 0.01%Gravimetric
    Particle Size0.1-1mm / 1-3mm / 2-4mmSieve Analysis

    Applications

    1. Agriculture & Horticulture: A high-efficiency fertilizer used to correct magnesium and sulfur deficiencies in crops (citrus, tomatoes, peppers, roses). It is highly soluble and ideal for fertigation and foliar spraying.
    2. Personal Care & Spa: Used as premium Epsom Salt for bath soaks to relieve muscle soreness, reduce stress, and exfoliate skin.
    3. Industrial Applications: Used in leather tanning as a weighting agent, in the dyeing industry as a color-fixing agent, and in the production of magnesium soaps and detergents.
    4. Construction: Acts as a stabilizer in magnesium oxychloride cement and as a flame retardant in specific plastic and resin formulations.
    5. Water Treatment: Used in the treatment of printing and dyeing wastewater and as a mineral supplement in aquaculture.
    6. Pharmaceutical & Food: Used as a fermentation aid, a nutritional supplement, and a drying agent in organic synthesis.

    Storage Conditions

    • Environment: Store in a cool, dry, and well-ventilated area.
    • Protection: Magnesium Sulfate Heptahydrate can lose water of crystallization (effloresce) in very dry air or cake in high humidity. Keep bags tightly sealed when not in use.
    • Stacking: Store on pallets to avoid ground moisture. Do not stack too high to prevent pressure-induced caking of the bottom bags.
    • Avoid: Keep away from direct sunlight and incompatible materials like strong oxidizing agents.

    Safety Precautions

    • General Handling: Non-toxic and non-flammable. However, avoid generating dust during handling.
    • Personal Protection: Wear safety glasses and protective gloves to prevent mild skin or eye irritation. If dust is present, use a standard N95/P2 dust mask.
    • First Aid: In case of eye contact, rinse with plenty of water for 15 minutes. If skin irritation occurs, wash with soap and water.
    • Ingestion: If large quantities are swallowed, seek medical advice. It is commonly used as a laxative, but industrial grades should never be consumed.

    FAQ - Technical & Supply Chain

    • Q:

      What is Magnesium Sulfate Heptahydrate CAS 10034-99-8?

      A: Magnesium sulfate heptahydrate, commonly called Epsom salt, is a highly water-soluble hydrated magnesium salt with the formula MgSO4·7H2O. It is supplied as white or colorless crystals and used in agriculture, industrial processing, personal care and approved food or pharmaceutical applications.
    • Q:

      How does Magnesium Sulfate Heptahydrate help in agriculture?

      A: It supplies readily available magnesium and sulfur, two essential plant nutrients. Agriculture-grade material is used in base fertilizers, topdressing, foliar sprays and irrigation systems to correct magnesium or sulfur deficiency without substantially changing soil pH.
    • Q:

      Which grade is needed for bath salt or food and pharmaceutical use?

      A: Bath-salt, personal-care, food and pharmaceutical applications require a food or pharmaceutical grade rather than agriculture or industrial grade. The selected material should meet the relevant purity, heavy-metal, arsenic and identity limits.
    • Q:

      What are the main non-agricultural applications?

      A: Typical uses include bath salts, personal-care products, mineral supplements and approved pharmaceutical preparations. Industrial grades are also used in paper, textiles, leather, ceramics, water treatment and chemical synthesis.
    • Q:

      Why does crystal size matter for Magnesium Sulfate Heptahydrate?

      A: Fine powder dissolves quickly and is convenient for foliar sprays or irrigation, while larger 1-3 mm crystals may be preferred for slower dissolution, handling characteristics or specific bath-salt appearance. Buyers should state the desired crystal size or particle-size range.
    • Q:

      What specifications should I check before ordering CAS 10034-99-8?

      A: Confirm MgSO4·7H2O content, pH, chloride, iron, heavy metals, arsenic and appearance. For hydrated material, also note loss on drying or water content, since the heptahydrate can release water of crystallization when heated.

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