Products Description

Chemical name	Magnesium sulfate heptahydrate
Common names	Sulfate of magnesia; Bitter salt; Diuretic salt; Diuretic ore
Chemical formula	MgSO4·7H2O
Molecular weight	246.47
CAS number	10034-99-8

EINECS number: 231-298-2
Melting point: 1124 ℃
Water solubility: Highly soluble
Density: 2.66 g/cm³
Appearance: White or colorless needle-like or oblique columnar crystals

Appearance and Properties: It belongs to the orthorhombic crystal system, presenting as tetragonal granular or rhombic crystals. It is colorless and transparent, and the aggregate has a white, rose-colored or green glassy luster. The shapes include fibrous, needle-like, granular or powder-like. It has no odor and a bitter taste.
Solubility: It is easily soluble in water, and slightly soluble in ethanol and glycerin.

Stability: Stable in humid air below 48.1℃, prone to weathering in warm and dry air. Above 48.1℃, one crystal water is lost, and it becomes magnesium sulfate hexahydrate. At 67.5℃, it dissolves its own crystal water and simultaneously precipitates magnesium sulfate monohydrate. At 70-80℃, four crystal waters are lost, at 100℃, five crystal waters are lost, at 150℃, six crystal waters are lost, at 200℃, all crystal waters are lost and it becomes powder form anhydrous magnesium sulfate. The dehydrated substance can regain water when placed in humid air. In a saturated magnesium sulfate solution, hydrated crystals with 1, 2, 3, 4, 5, 6, or 12 water molecules can be crystallized. In a saturated water solution at -3.9 to 1.8℃, magnesium sulfate dodecahydrate is precipitated. In a saturated water solution at -1.8 to 48.18℃, magnesium sulfate heptahydrate is precipitated. In a saturated water solution at 48.1 to 67.5℃, magnesium sulfate hexahydrate is precipitated. Above 67.5℃, magnesium sulfate monohydrate is precipitated. Magnesium sulfate hexahydrate undergoes isomorphism melting between 87 and 92℃ and forms pentahydrate or tetrahydrate magnesium sulfate. Tetrahydrate magnesium sulfate transforms into dihydrate magnesium sulfate at 106℃, dihydrate magnesium sulfate transforms into stable monohydrate magnesium sulfate at 122-124℃, and monohydrate magnesium sulfate transforms into stable dihydrate magnesium sulfate at 161-169℃.

Products Application

Food
As a food fortifier. Our country stipulates that it can be used in dairy products, with a usage amount of 3 to 7 grams per kilogram; in beverages and milk drinks, the usage amount is 1.4 to 2.8 grams per kilogram; in mineral beverages, the maximum usage amount is 0.05 grams per kilogram. Industry
It is often combined with calcium salts for use in the water for yeast fermentation. Adding 4.4g per 100 liters of water can increase the hardness by 1 degree. However, excessive use will result in a bitter taste and a sulfide hydrogen odor.
It is used in leather manufacturing, explosives, papermaking, porcelain production, fertilizer, as well as oral laxatives in medicine and other fields. It is a mineral water additive. Agriculture
Magnesium sulfate is used as a fertilizer in agriculture because magnesium is one of the main components of chlorophyll. It is usually applied to potted plants or crops deficient in magnesium, such as tomatoes, potatoes, roses, etc. The advantage of magnesium sulfate over other fertilizers is its higher solubility. Magnesium sulfate is also used as a bath salt.