We are supplying comprehensive raw materials of welding flux. The specs for ferrosilicon shows as below: Si (%): 43.0-46.0 or 72.0-75.0 C (% max): 0.1 or 0.08 P (% max): 0.04 S (% max): 0.03 Mn (% max): 1.0 or 0.3Al (% max): 1.0 or 2.0Size: -60 mesh / -80 mesh or according to customer's requirementPacking: according to customer's requirement producing area:China