The silicon metal include the types of 553,441,1101,2202 etc because of the differnet content of iron, aluminum and calcium, such as silicon metal 553, the content of iron is 0.5%max, aluminum 0.5% and calcium 0.3% , the silicon metal 1101 is with the content of iron 0.1%, aluminum 0.1% and calcium not more than 0.01%. Silicon metal is generally supplied in the size of 10-100mm, packing 1ton jumbo bags. Silicon metal is always be used as alloy additive for aluminum products or aluminum alloy, if any require please contactc us.