... of mordants, metallurgy industry of chlorinated Usage:Mainly used for the sewage treatment, the dehydration of the sludge, ... the etching for the printed circuit board,the erosion of the stainless ... steel,the chlorination agent for the metallurgic industry,the oxidant and the dying ... /lAs—≤0.1%≤10mg/l≤5mg/l Best price for ferric chloride