Salts & Minerals
REACH
Magnesium sulfate heptahydrate
CAS Number
10034-99-8
EC Number
231-298-2
What is Magnesium sulfate heptahydrate?
Magnesium sulfate heptahydrate (CAS 10034-99-8), commonly known as Epsom salt and approved as E518, is a hydrated inorganic salt supplying bioavailable magnesium.
Where is Magnesium sulfate heptahydrate used?
- Agriculture: corrects magnesium deficiency in soils, applied as foliar spray or soil amendment
- Food and beverage: mineral fortifier and brewing process aid that adjusts water hardness
- Pharmaceutical and nutraceutical: magnesium supplement active in oral and topical preparations, including bath salts
- Water treatment: adjusts mineral balance in process water
- It also serves as a nutrient source, process aid and stabilizer depending on the end-use sector.
Good to know: Grades include food-grade (FCC), pharmaceutical-grade (USP, BP, Ph. Eur.) and technical-grade; grade selection is driven by end-use regulatory requirements.
Commercial specifications
- Packaging from 25 kg bags to bulk quantities
Other Names (Synonyms)
MgSO₄⋅7H₂O|MgSO4⋅7H2O|magnesium sulphate heptahydrate|hydrated magnesium sulfate|Epsom salt|Magnesia sulphurica|Magnesium sulfate (1:1) heptahydrate|Epsom salt(heptahydrate)|E518
What are the physical properties of Magnesium sulfate heptahydrate?
Melting Point 50.59 °C
Density 1.67 g/cm³
Appearance White crystalline powder
Color White
Odor Odorless
Form Solid
Water Solubility Soluble in in water and acid. Slightly soluble in alcohol and glycerol.
Vapor Pressure <0.1 mm Hg ( 20 °C)
Refractive Index 1.433
pH 5.0-8.0 (25℃, 50mg/mL in H2O)
Log P -1.031 (est)
Which trade and regulatory codes apply to Magnesium sulfate heptahydrate?
HS Code 28332100
Storage Class 13 - Non Combustible Solids
WGK (Germany) 1