... ,99.5% min 1,Origin : Tianjin, China 2, MgSO4.7H2O 3, white crystal magnesium sulphate hepta ,99.5% min 1,Origin ... : Tianjin, China 2, MgSO4.7H2O 3, white crystal MAGNESIUM SULPHATE(feed grade) NoTest ItemTechnical specification (%)Analysis ...