Formula:MgSO4nH2O (n=0,1,2,3,4,5,6,7)
Weight:120.37+18n (n= 0,1,2,3,4,5,6,7)
CAS No:10034-99-8 (MgSO47H2O)/7487-88-9 (MgSO4)

Specifications (USP / BP / CP / EP standard) :  

Introductions of purposes for MgSO4

In medicine, it can be used in deployment of protective ointments, laxatives, analgesics, antidotes, anticonvulsants and can be processed into the meleumycinum, Acetylspiramycin, creatinine, magnesium trisilicate, griseofulvin, saltneomycin, mildew prime, tobramycin, nephritis Kang, gibberellic acid, sulfuric acid volume neomycin.
in the industrial microorganisms, it is used as medium components for brewing additive magnesium supplementary brewing water, a nutrient source in the fermentation;

In light industry, it is used as stabilizers for Calcium hydrogen phosphate in producing Fresh yeast, MSG, drinks, mineral water, health, salt, sea crystal bath Kang, "Bolton" beer and toothpaste
Used as food additives, curing agents, flavor enhancers, processing aids in nutritional supplements,; In the chemical industry, it is used in producing magnesium salts, such as Magnesium stearate Magnesium hydrogen phosphate,Magnesia and producing Sulfate, such as potassium sulfate, sodium sulfate and etc. In dyeing and finishing industry, it is used as alkali-resistant agents or weighting agent in dyeing cotton and silk; also can be used in producing rayon and as kapok filler. Used as a filler in the leather industry to enhance the heat resistance; Used as the conductive salt in the electroplating industry. Added into Nickel plating solution, it strengthens the Nickel plating solution, making the cladding softer and whiter. Used as additives in producing aluminum to make the aluminum surface coloring. It is used as flame retardants for acrylate resin, epoxy resin, unsaturated polyesters and polyurethanes in the fireproof materials. It is used in industrial wastewater treatment also.
In agriculture, MgSO4 is a excellent dual-nutrients fertilizer because of the elements Mg and S, which is the 5th and 6th important Ingredients for crops. They not only increase crop yield also improve the taste. Magnesium is component of chlorophyll and colorants, and it's the only one of metallic element in the chlorophyll molecule. It can promote the photosynthesis to generate carbohydrate, protein, fat. It is used as additives In Animal husbandry and as coagulant aid for cement in building industry. 
In addition, it can be used in explosives, matches, porcelain, glass, pigments, pulp, ABS resin.