Mainly for the filtration of air , the medium cleaning and flow contol of lubrication oil . hydraulic pressure and air pressure expanded Square metal sheet Material:Aluminum plate, thin low cabon steel plate, stainless steel plate. AL-Mg alloy plateexpanded square metal sheetMaterial:Aluminum plate,thin low cabon steel plate,stainless steel plate.AL-Mg alloy plate,copper plate,nickel plate. ...