... HeptahydrateMolecular formaula: MgSO47H2O molecular weight: 246.46 Charateristics: no-color o white crystal, bitter or salty taste, odourless ... , have no nature of efflorescence. Use: mainly applying to feed additive ... cotton cloth, silk, stuffing of kapok products, grass-making, fertilizer, China, paint, match, explosive and fireproof materials and ...