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 (Epsom salt), CAS 10034-99-8, is a water-soluble magnesium and sulfur source supplied for fertilizer, feed and industrial applications. Confirm the required grade, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 10034-99-8
Synonyms: Epsom Salt, Magnesium sulphate heptahydrate, 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, CAS 10034-99-8, also known as Epsom salt, is a white crystalline hydrated magnesium sulfate; the EC/EINECS number is 231-298-2.

Synonyms: Epsom salt; Magnesium sulphate heptahydrate; Magnesium sulfate 7H₂O.

CAS: 10034-99-8.

Molecular formula: MgSO₄·7H₂O.

Molecular weight: about 246.37.

EC number: 231-298-2.

It is a white or colorless crystalline solid or granules, odorless, with a density of about 1.68 g/cm³ at 20 °C.

It is very soluble in water (about 71 g/100 g water at 20 °C) and practically insoluble in ethanol; a 5% aqueous solution typically has a pH of 5.0–8.0.

It loses crystal water from about 48 °C and decomposes on strong heating; it is hygroscopic and may cake if exposed to moisture.

It is used as a magnesium and sulfur source in compound fertilizers and bulk blends for field crops, fruits, vegetables and oil-bearing crops.

It is used as a feed additive to supplement magnesium in livestock and poultry nutrition, applied in premixes and complete feeds.

It is used in textile dyeing as a leveling agent, in leather processing, and in construction and water-treatment formulations.

Confirm the intended fertilizer, feed or industrial grade and check appearance, assay, magnesium content, sulfur content, loss on ignition, pH, chloride, iron, heavy metals and trace impurities.

Store in tightly closed bags in a cool, dry, moisture-protected area; use dust-control measures when handling and avoid contact with strong acids.

Confirm the current product-specific specification.

Confirm packaging with the requested quantity and destination requirements.

Document requirements should be confirmed from the current specification, SDS, COA or other product-specific files.

The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

For an RFQ, state the intended use, required specification, quantity, packaging, destination and document needs.

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.

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