... Expanded .original 3,size:6-12mm,3-6mm,2-4mm,1-3mm 4,Origin:Hebei ,China Feature ProductsExpanded ... ,40-80mesh ,20-40mesh,10-40mesh,1-3mm,2-4mm,3-8 mm,4-8mmSilver:40-80mesh ,20- ... 1-2mm,1.5-2.5mm,1-3mm,2-4mm,3-8mm,4-8mmSilver:0.3-1mm,1-2mm,2-4mm,4-8mm Note ... preservation,poisonless,odorless, low hardnes 2,Chemical compositions:ItemSiO2MgOFe2O3Al2O3CaOK2OH2OPHContent %37-4211-233.5-189-171-25-85-117-11 ...