magnesium sulfate

We are exporter of long-standing and high-reputation trading in all kinds of chemical material in north of China ,Now we desire to expand the business we do with you ,and would be more grateful to establish business relationship with you .
the product specification as follow：
Purity 99% Min
Ca,Mg (By Mg) 0.15% Max
Iron(By Fe) 0.002% Max
Chloride(By CI) 0.35% Max
Water Insoluble 0.05% Max
Moisture 0.20% Max
Whiteness 80% Min
PH 6-8,9-11
Residue 10% Max 60 mesh.