... ten years.We can produce high purity of all grade Silicon Metal ,such as #553,#441,#421,#3303,#2202#, ... competitive price and superior quaility.Application:Silicon Aluminum Alloy manufacturing, ADC12, A356, etc.Organic Silicon manufacturing, such as silicone rubber, ... Quality Management System authorized by SGS in silicon field. international grade metal silicon 441/553/3303/2202/1515/2203/2503/ ...