Ferro Silicon Zirconium Zr: 30--35% Si: 50--55% Al: 2.0% Max Ferro Silicon ZirconiumSpecification: Si: 70~76%, Ca: 2.2~2 ... 7%, Al: 0.5~1.5%, Zr: 1.2~2%Si: 72~79%, Ca: 2.2~2.7%, Al: 0. ... 5~1.5%, Zr: 1.2~2.2%Si: 45 ~55%, Zr: 30%Min., C: 0.3%Max., ... 3%Max., S: 0.02%Max., P: 0.04%Max. Si: 50~55%, Zr: 30~35%, Ca: 1~2%, Al: 1. ... 07MM(90%Min.), 0.5~1.5MM(90%Min.), 5~50 MM(90%Min.), 3~30 MM(90%Min.), Etc. ...