Molekula
Magnesium sulfate heptahydrate
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Magnesium sulfate heptahydrate is a hydrated inorganic salt commonly used in agriculture, pharmaceuticals, and laboratory applications. It serves as a source of magnesium and sulfate ions. Buyers use it as a fertilizer and soil amendment that supplies magnesium and sulfur, and as a flocculating agent in industrial processing. Available with a molecular weight of 246.48 g/mol, it has the CAS number 10034-99-8 and the molecular formula MgSO4·7(H2O). Stored at ambient temperatures, it carries no signal word. Molekula supplies Magnesium sulfate heptahydrate from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Often bought together
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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500 g — $30.40 per pack
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1 kg — $38.30 per pack
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5 kg — $118.00 per pack
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Colourless to White Crystals |
| Heavy metals | ≤ 10.0 ppm |
| Identification | Conforms to reference |
| pH | (50g/L) 5.5 - 7.5 |
| Loss on Drying | 40.0%-52.0% |
| Assay | ≥99.0% |
| Chlorides | ≤ 0.03% |
| Iron (Fe) | ≤ 20.0 ppm |
| Lead (Pb) | ≤ 2.0 ppm |
| Arsenic (As) | ≤ 3.0 ppm |
| Selenium (Se) | ≤ 30.0 ppm |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Neutral |
Identification
| Property | Value |
|---|---|
| SKU | 22772499 |
| CAS Number | 10034-99-8 |
| IUPAC Name | magnesium;sulfate;heptahydrate |
| Molecular Formula | MgSO4·7(H2O) |
| Molecular Weight | 246.48 |
| Exact Mass | 246.0107 |
| SMILES | O.O.O.O.O.O.O.[O-]S(=O)(=O)[O-].[Mg+2] |
| InChIKey | WRUGWIBCXHJTDG-UHFFFAOYSA-L |
| InChI | InChI=1S/Mg.H2O4S.7H2O/c;1-5(2,3)4;;;;;;;/h;(H2,1,2,3,4);7*1H2/q+2;;;;;;;;/p-2 |
| PubChem CID | 24843 |
| REACH Code | Y113 |
| Tariff Code | 28332100 |
Safety & GHS
Detailed safety information available in the SDS — see Documents below.
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Portuguese, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Bitter salt
- Epsom salt
- Epsom salt(heptahydrate)
- Humco Epson Salt
- Magnesia sulphurica
- Magnesii sulfatis heptahydras
- Magnesium sulfate (1:1) heptahydrate
- magnesium sulphate heptahydrate
- Sulfuric acid magnesium salt (1:1), heptahydrate
- Theraworx Relief
Frequently asked questions
What is magnesium sulfate heptahydrate used for?
It is commonly used in agriculture as a magnesium source, in pharmaceuticals for treating magnesium deficiency, and in laboratory applications as a reagent and as a magnesium source in microbiological culture media such as M9 minimal medium.
What is the chemical formula and molecular weight?
The formula is MgSO4·7(H2O) and the molecular weight is 246.48 g/mol.
How should magnesium sulfate heptahydrate be stored?
It should be stored at ambient temperature, away from moisture and direct sunlight.
What grade is available?
Available in reagent grade and technical grade; specific grades may vary based on customer requirements.
Can Molekula supply it in bulk?
Yes, Molekula can supply magnesium sulfate heptahydrate in bulk quantities; please contact sales for pricing and availability.
What documentation comes with the order?
Each order includes a Certificate of Analysis (CoA) and safety data sheet (SDS); additional documentation can be provided upon request.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.