How does the heptahydrate form differ from other magnesium sulfates?

CAS 10034-99-8 identifies magnesium sulfate heptahydrate, MgSO4·7H2O. The seven water molecules represent about 48-52% of the product weight by loss on ignition, so the heptahydrate has lower magnesium and sulfur content than anhydrous or monohydrate grades. This also changes solubility behavior, nutrient dosing, and handling.

Is this grade suitable for liquid fertilizer and hydroponic use?

Yes. Magnesium sulfate heptahydrate dissolves readily in water, providing a clear source of magnesium and sulfur for foliar fertilizers, fertigation, and hydroponic nutrient solutions. For high-concentration liquid blends, confirm the required concentration, pH, and compatibility with other fertilizer salts before batching.

What are other common applications?

Outside agriculture, this product is used as an animal-feed magnesium supplement, in textile dyeing and leather processing, and as a component in construction and water-treatment formulations. It also serves as a source of magnesium in other chemical preparations.

What specifications should be checked before ordering?

Confirm the intended fertilizer, feed, or industrial grade and check appearance, assay, magnesium content, sulfur content, and loss on ignition or water. For feed and sensitive uses, also check pH of a 5% solution, chloride, iron, heavy metals, and other applicable trace-impurity limits. Confirm the hydrate form to avoid confusion with anhydrous or monohydrate material.

How should Magnesium Sulfate Heptahydrate be stored and handled?

Keep it in tightly closed bags or containers in a cool, dry, moisture-protected area because the heptahydrate can cake or release water when exposed to humid air. Use standard dust-control measures when handling bulk powder or granules, and avoid contact with strong acids. Rotate inventory and keep the packaging sealed between uses.

Magnesium Sulfate Heptahydrate CAS 10034-99-8

Magnesium Sulfate Heptahydrate (CAS 10034-99-8), commonly recognized as industrial-grade Epsom Salt, is a water-soluble inorganic compound utilized primarily as a magnesium and sulfur micronutrient in agricultural fertilizers and as a conditioning agent in textile processing. This crystalline Magnesium sulphate 7-hydrate functions to correct mineral deficiencies in soil and livestock feed, while serving as a weighting agent and dyeing auxiliary in fabric manufacturing. Unlike the anhydrous form, this Magnesium sulfate 7H2O possesses high solubility and neutral pH stability, making it a critical Bitter salt component for bath salt formulations and wastewater treatment coagulants. We provide this inorganic raw material with competitive factory pricing to support agricultural and industrial blending operations and ensure bulk supply availability for high-volume orders. Our facility accommodates customized specifications for crystal size (0.1-3mm) and purity grades, while every shipment is fully documented with MSDS, TDS, COA files to meet quality and safety regulations.

CAS: 10034-99-8
Synonyms: Epsom Salt, Magnesium sulphate 7-hydrate, Magnesium sulfate 7H2O
Einecs: 231-298-2
Molecular Formula: MgSO₄·7H₂O
Grade: Industrial / Fertilizer / Feed grade
Package: 25 kg plastic woven bag, 50 kg bag, 1000 kg jumbo bag or customized

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Product Description

Magnesium sulfate heptahydrate is a white, free-flowing crystalline salt widely used as a source of magnesium and sulfur in fertilizers, animal nutrition and various industrial processes. We supply consistent-quality material with controlled impurities, suitable for blending, direct application or further formulation.

1 Physicochemical Properties

2 Applications

3 Storage Conditions

4 Safety Precautions

Physicochemical Properties

Item	Specification / Value
Chemical Name	Magnesium sulfate heptahydrate
Synonyms	Epsom salt; Magnesium sulphate 7-water
CAS No.	10034-99-8
Einecs No.	231-298-2
Molecular Formula	MgSO₄·7H₂O
Molecular Weight	Approx. 246.37 g/mol
Appearance	White or colorless crystalline solid / granules
Odor	Odorless
Density	Approx. 1.68 g/cm³ (20 °C)
Solubility	Very soluble in water (approx. 71 g/100 g water at 20 °C); practically insoluble in ethanol
pH (5% aqueous solution)	Typically about 5.0–8.0 (20 °C)
Melting / Decomposition	Loses crystal water from around 48 °C; decomposes on strong heating
Hygroscopicity	Hygroscopic; may cake if exposed to moisture
Stability	Stable under normal temperature and dry storage conditions

Applications

1. Agriculture & Fertilizers

Used as a magnesium and sulfur source in compound fertilizers and bulk blends
Suitable for field crops, fruits, vegetables and oil-bearing crops that are sensitive to magnesium deficiency
Can be applied as base fertilizer, top dressing or foliar spray when formulated appropriately

2. Animal Nutrition

Used as a feed additive to supplement magnesium and support normal nerve and muscle function in livestock and poultry
Applied in premixes and complete feeds under controlled dosage

3. Industrial Uses

Textile industry: as a dyeing assistant and leveling agent
Paper industry: auxiliary agent in pulping and paper treatment
Construction and building materials: component in cement and gypsum formulations and certain fireproofing systems
Chemical industry: intermediate or auxiliary in the production of other magnesium salts and process chemicals

4. Other Uses

Raw material or ingredient in bath salts, personal care and cosmetic products (with appropriate grade selection)
Laboratory reagent and buffer component

For special applications, please share your technical requirements by email for tailored specifications.

Storage Conditions

Store in a cool, dry and well-ventilated warehouse.
Keep bags tightly closed to prevent moisture absorption and caking.
Avoid direct sunlight, high temperature and exposure to rain.
Do not store together with strong acids or substances that may be affected by moisture.
Use pallets and avoid direct contact of bags with the floor to maintain product quality.

Safety Precautions

Magnesium sulfate heptahydrate is generally considered to have low acute toxicity, but standard industrial hygiene practices should always be followed:

Avoid inhalation of dust; use local exhaust ventilation where dust may be generated.
Wear appropriate personal protective equipment (PPE) such as gloves, dust mask/respirator and safety goggles.
Avoid prolonged or repeated contact with skin and eyes.
In case of eye contact, rinse immediately with plenty of clean water for several minutes and seek medical advice if irritation persists.
In case of skin contact, wash with soap and water.
If large amounts are accidentally ingested or inhaled, seek medical attention.
Keep out of reach of children and non-trained personnel.

FAQ - Technical & Supply Chain

Q:
How does the heptahydrate form differ from other magnesium sulfates?

A: CAS 10034-99-8 identifies magnesium sulfate heptahydrate, MgSO4·7H2O. The seven water molecules represent about 48-52% of the product weight by loss on ignition, so the heptahydrate has lower magnesium and sulfur content than anhydrous or monohydrate grades. This also changes solubility behavior, nutrient dosing, and handling.
Q:
Is this grade suitable for liquid fertilizer and hydroponic use?

A: Yes. Magnesium sulfate heptahydrate dissolves readily in water, providing a clear source of magnesium and sulfur for foliar fertilizers, fertigation, and hydroponic nutrient solutions. For high-concentration liquid blends, confirm the required concentration, pH, and compatibility with other fertilizer salts before batching.
Q:
What are other common applications?

A: Outside agriculture, this product is used as an animal-feed magnesium supplement, in textile dyeing and leather processing, and as a component in construction and water-treatment formulations. It also serves as a source of magnesium in other chemical preparations.
Q:
What specifications should be checked before ordering?

A: Confirm the intended fertilizer, feed, or industrial grade and check appearance, assay, magnesium content, sulfur content, and loss on ignition or water. For feed and sensitive uses, also check pH of a 5% solution, chloride, iron, heavy metals, and other applicable trace-impurity limits. Confirm the hydrate form to avoid confusion with anhydrous or monohydrate material.
Q:
How should Magnesium Sulfate Heptahydrate be stored and handled?

A: Keep it in tightly closed bags or containers in a cool, dry, moisture-protected area because the heptahydrate can cake or release water when exposed to humid air. Use standard dust-control measures when handling bulk powder or granules, and avoid contact with strong acids. Rotate inventory and keep the packaging sealed between uses.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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